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Сервер доступа OpenVPN: удаленная подсеть не может получить доступ к ресурсам клиента

У меня есть сервер доступа OpenVPN, работающий на AWS. Вот конфигурация: 

172.18.16.0/20
Client (172.18.16.101) ----- OpenVPN Server (172.16.0.0/20)
                                     |
                                     |
                                     |
                                     |
                               Private Subnet (172.16.16.0/20)

Клиент может подключиться к серверу OpenVPN. Сервер OpenVPN может проверять связь и получать доступ к ресурсам как на клиенте, так и в частной подсети. Клиент также может получить доступ ко всем ресурсам на сервере OpenVPN, а также к частной подсети. Кроме того, сервер OpenVPN также может получать доступ к ресурсам на клиенте. Однако ящики в частной подсети вообще не могут пинговать или получать доступ к ресурсам на клиенте.

Конфигурация сети сервера OpenVPN:

as0t0     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:172.18.0.1  P-t-P:172.18.0.1  Mask:255.255.248.0
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:200 
          RX bytes:1223 (1.2 KB)  TX bytes:968 (968.0 B)

as0t1     Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
          inet addr:172.18.8.1  P-t-P:172.18.8.1  Mask:255.255.248.0
          UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:200 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

eth0      Link encap:Ethernet  HWaddr 06:e2:83:cf:4f:27  
          inet addr:172.16.12.204  Bcast:172.16.15.255  Mask:255.255.240.0
          inet6 addr: fe80::4e2:83ff:fecf:4f27/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:9001  Metric:1
          RX packets:1355 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1193 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:124194 (124.1 KB)  TX bytes:153022 (153.0 KB)

Таблица маршрутов сервера OpenVPN:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.16.0.1      0.0.0.0         UG    0      0        0 eth0
172.16.0.0      0.0.0.0         255.255.240.0   U     0      0        0 eth0
172.18.0.0      0.0.0.0         255.255.248.0   U     0      0        0 as0t0
172.18.8.0      0.0.0.0         255.255.248.0   U     0      0        0 as0t1
172.18.16.101   0.0.0.0         255.255.255.255 UH    0      0        0 as0t0

Поле в таблице маршрутов частной подсети:

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.16.16.1     0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     0      0        0 eth0
172.16.16.0     0.0.0.0         255.255.240.0   U     0      0        0 eth0

Я запустил tcpdump на интерфейсе as0t1 серверного ящика OpenVPN, одновременно отправляя эхо-запрос из ящика в частной подсети клиенту. Похоже, что запросы были переадресованы клиенту, и клиент также отправил ответы (видно в поле OpenVPN). Однако кажется, что на этом все и закончилось, и ответы на eth0 так и не вернулись. Я считаю, что таблица маршрутизации должна быть правильной, поскольку сервер OpenVPN может достигать всего, а клиент также может достигать частной подсети. Я думал, что проблема в iptables, но, потратив на это несколько часов, я начинаю сдаваться. Вот таблицы:

Таблица фильтров

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         
AS0_ACCEPT  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_ACCEPT  all  --  anywhere             anywhere            
AS0_IN_PRE  all  --  anywhere             anywhere             mark match 0x2000000/0x2000000
AS0_ACCEPT  udp  --  anywhere             anywhere             state NEW udp dpt:openvpn
AS0_ACCEPT  tcp  --  anywhere             anywhere             state NEW tcp dpt:https
AS0_WEBACCEPT  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_WEBACCEPT  tcp  --  anywhere             anywhere             state NEW tcp dpt:943

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
AS0_ACCEPT  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_IN_PRE  all  --  anywhere             anywhere             mark match 0x2000000/0x2000000
AS0_OUT_S2C  all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         
AS0_OUT_LOCAL  all  --  anywhere             anywhere            

Chain AS0_ACCEPT (5 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_IN (3 references)
target     prot opt source               destination         
ACCEPT     icmp --  anywhere             ip-172-18-0-1.ap-southeast-1.compute.internal  icmp echo-request
ACCEPT     icmp --  anywhere             ip-172-18-8-1.ap-southeast-1.compute.internal  icmp echo-request
AS0_U_TMBDLP_IN  all  --  ip-172-18-16-101.ap-southeast-1.compute.internal  anywhere            
AS0_IN_POST  all  --  anywhere             anywhere            

Chain AS0_IN_NAT (1 references)
target     prot opt source               destination         
MARK       all  --  anywhere             anywhere             MARK or 0x8000000
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_IN_POST (2 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/16 
AS0_OUT    all  --  anywhere             anywhere            
DROP       all  --  anywhere             anywhere            

Chain AS0_IN_PRE (2 references)
target     prot opt source               destination         
AS0_IN     all  --  anywhere             ip-192-168-0-0.ap-southeast-1.compute.internal/16 
AS0_IN     all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/12 
AS0_IN     all  --  anywhere             ip-10-0-0-0.ap-southeast-1.compute.internal/8 
DROP       all  --  anywhere             anywhere            

Chain AS0_IN_ROUTE (0 references)
target     prot opt source               destination         
MARK       all  --  anywhere             anywhere             MARK or 0x4000000
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_OUT (2 references)
target     prot opt source               destination         
AS0_U_TMBDLP_OUT  all  --  anywhere             ip-172-18-16-101.ap-southeast-1.compute.internal 
AS0_OUT_POST  all  --  anywhere             anywhere            

Chain AS0_OUT_LOCAL (1 references)
target     prot opt source               destination         
DROP       icmp --  anywhere             anywhere             icmp redirect
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_OUT_POST (2 references)
target     prot opt source               destination         
DROP       all  --  anywhere             anywhere            

Chain AS0_OUT_S2C (1 references)
target     prot opt source               destination         
AS0_OUT    all  --  anywhere             anywhere            

Chain AS0_U_TMBDLP_IN (1 references)
target     prot opt source               destination         
AS0_IN_NAT  all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/16 
AS0_IN_POST  all  --  anywhere             anywhere            

Chain AS0_U_TMBDLP_OUT (1 references)
target     prot opt source               destination         
ACCEPT     all  --  ip-172-16-0-0.ap-southeast-1.compute.internal/16  anywhere            
ACCEPT     all  --  ip-172-18-0-0.ap-southeast-1.compute.internal/20  anywhere            
ACCEPT     all  --  ip-172-18-16-0.ap-southeast-1.compute.internal/20  anywhere            
AS0_OUT_POST  all  --  anywhere             anywhere            

Chain AS0_WEBACCEPT (2 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere

Таблица NAT

Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination         
AS0_NAT_PRE_REL_EST  all  --  anywhere             anywhere             state RELATED,ESTABLISHED

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination         
AS0_NAT_POST_REL_EST  all  --  anywhere             anywhere             state RELATED,ESTABLISHED
AS0_NAT_PRE  all  --  anywhere             anywhere             mark match 0x2000000/0x2000000

Chain AS0_NAT (3 references)
target     prot opt source               destination         
MASQUERADE  all  --  anywhere             anywhere            

Chain AS0_NAT_POST_REL_EST (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_NAT_PRE (1 references)
target     prot opt source               destination         
AS0_NAT    all  --  anywhere             anywhere             mark match 0x8000000/0x8000000
AS0_NAT_TEST  all  --  anywhere             ip-192-168-0-0.ap-southeast-1.compute.internal/16 
AS0_NAT_TEST  all  --  anywhere             ip-172-16-0-0.ap-southeast-1.compute.internal/12 
AS0_NAT_TEST  all  --  anywhere             ip-10-0-0-0.ap-southeast-1.compute.internal/8 
AS0_NAT    all  --  anywhere             anywhere            

Chain AS0_NAT_PRE_REL_EST (1 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            

Chain AS0_NAT_TEST (3 references)
target     prot opt source               destination         
ACCEPT     all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere             mark match 0x4000000/0x4000000
ACCEPT     all  --  anywhere             ip-172-18-0-0.ap-southeast-1.compute.internal/20 
ACCEPT     all  --  anywhere             ip-172-18-16-0.ap-southeast-1.compute.internal/20 
AS0_NAT    all  --  anywhere             anywhere

Я почти уверен, что проблема в правилах iptables, но я не могу ее отследить. Просто для некоторого дополнительного удовольствия я также добавляю сюда вывод трассировки iptables (захваченный в поле OpenVPN).

Поле в частной подсети, доступ к серверу MySQL на клиенте (сбой):

Aug 28 17:42:33 localhost kernel: [21906.075591] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075603] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075608] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075616] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075620] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075625] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:33 localhost kernel: [21906.075629] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2522 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F60F3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115440] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115452] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115458] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115466] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115470] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115475] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.115480] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2523 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9EE3250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175467] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175474] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175479] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175486] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175490] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175494] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:34 localhost kernel: [21907.175498] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2524 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A0265F9F83250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.077995] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078007] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078012] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078021] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078025] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078030] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.078034] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2525 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026601C23250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287922] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287932] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287937] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287945] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287949] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287954] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:36 localhost kernel: [21909.287958] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2526 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026602903250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165296] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165308] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165313] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165321] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165326] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165330] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.165335] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2527 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026611653250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285405] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285414] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285419] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285427] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285431] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285435] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:40 localhost kernel: [21913.285440] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2528 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026612303250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097914] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097926] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097931] TRACE: mangle:AS0_MANGLE_PRE_REL_EST:return:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097939] TRACE: mangle:FORWARD:policy:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097943] TRACE: filter:FORWARD:rule:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097948] TRACE: filter:AS0_ACCEPT:return:1 IN=as0t1 OUT=eth0 MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:48 localhost kernel: [21921.097964] TRACE: mangle:POSTROUTING:policy:1 IN= OUT=eth0 SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=63 ID=2529 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026630B93250188401030308) 
Aug 28 17:42:49 localhost kernel: [21921.527746] TRACE: raw:PREROUTING:policy:2 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2530 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026632383250188401030308) 
Aug 28 17:42:49 localhost kernel: [21921.527756] TRACE: mangle:PREROUTING:rule:1 IN=as0t1 OUT= MAC= SRC=172.18.16.101 DST=172.16.22.22 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=2530 PROTO=TCP SPT=3306 DPT=47378 SEQ=4120644767 ACK=110803956 WINDOW=14480 RES=0x00 ACK SYN URGP=0 OPT (020404F40402080A026632383250188401030308) 
##### the rest are cut due to exceeding number of characters allowed #####

Конфигурация пересылки

$ cat /proc/sys/net/ipv4/ip_forward
1

TL; Версия DR:

  1. На панели инструментов EC2 выберите экземпляр EC2, на котором запущен OpenVPN Access Server.
  2. Щелкните Действия -> Сеть -> Изменить источник / назначение. Проверить -> Да, отключить

Чтобы получить больше информации: Отключение проверки источника / назначения

Оказалось, что все мои настройки OpenVPN и маршрута были правильными, и это была проблема, специфичная для AWS. Я наткнулся на ответ, когда гуглил специально для настройки OpenVPN на AWS:

При подключении EC2 VPC к OpenVPN весь маршрутизируемый трафик теряется

То, что с ним случилось (цитируется ниже), было точно таким же, что я наблюдаю ...

Однако вот в чем дело. Выполнение tcpdump на сервере EC2 OpenVPN показывает, что весь трафик проходит должным образом:

[root@ip-10-2-0-10 ~]# tcpdump -i eth0 -n host 10.1.0.3
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
13:46:58.779826 IP 10.2.0.12 > 10.1.0.3: ICMP echo request, id 21846, seq 1, length 64
13:46:58.852756 IP 10.1.0.3 > 10.2.0.12: ICMP echo reply, id 21846, seq 1, length 64
13:46:59.787467 IP 10.2.0.12 > 10.1.0.3: ICMP echo request, id 21846, seq 2, length 64
13:46:59.847424 IP 10.1.0.3 > 10.2.0.12: ICMP echo reply, id 21846, seq 2, length 64