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icmp_seq = 1 Пункт назначения недоступен: нет маршрута

Я получаю эту ошибку, когда использую a1 ping 2001:638:709:a2::1 в моем скрипте Python, который работает на mininet.

Я не понимаю, из-за моего кода или из-за путей к файлам. Файлы конфигурации находятся в той же папке, что и скрипт python.

Это для создания сети OSPF с двумя интернет-провайдерами: F и E.

Вот сценарий Python:

 from mininet.cli import CLI
from mininet.net import Mininet
from mininet.log import setLogLevel

if __name__ == '__main__':
    setLogLevel('info')

    net = Mininet(switch=None, controller=None)

    # Topology of ISP 'f':

    a1 = net.addHost('a1', ip=None)
    a2 = net.addHost('a2', ip=None)
    a3 = net.addHost('a3', ip=None)
    a4 = net.addHost('a4', ip=None)

    f1 = net.addHost('f1', ip=None)
    f1.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")
    f2 = net.addHost('f2', ip=None)
    f2.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")
    f3 = net.addHost('f3', ip=None)
    f3.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")
    f4 = net.addHost('f4', ip=None)
    f4.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")

    net.addLink(a1, f1)
    net.addLink(a2, f2)
    net.addLink(a3, f3)
    net.addLink(a4, f4)

    net.addLink(f1, f2)
    net.addLink(f2, f3)
    net.addLink(f3, f4)
    net.addLink(f4, f1)

    a1.cmd("ip addr add 2001:638:709:a1::1/64 dev a1-eth0")
    a1.cmd("ip route add default via 2001:638:709:a1::f1 dev a1-eth0")
    a2.cmd("ip addr add 2001:638:709:a2::1/64 dev a2-eth0")
    a2.cmd("ip route add default via 2001:638:709:a2::f2 dev a2-eth0")
    a3.cmd("ip addr add 2001:638:709:a3::1/64 dev a3-eth0")
    a3.cmd("ip route add default via 2001:638:709:a3::f3 dev a3-eth0")
    a4.cmd("ip addr add 2001:638:709:a4::1/64 dev a4-eth0")
    a4.cmd("ip route add default via 2001:638:709:a4::f4 dev a4-eth0")

    f1.cmd("ip addr add 2001:638:709:a1::f1/64 dev f1-eth0")
    f2.cmd("ip addr add 2001:638:709:a2::f2/64 dev f2-eth0")
    f3.cmd("ip addr add 2001:638:709:a3::f3/64 dev f3-eth0")
    f4.cmd("ip addr add 2001:638:709:a4::f4/64 dev f4-eth0")

    f1.cmd("ip addr add 2001:638:709:f::f2:f1/64 dev f1-eth1")
    f1.cmd("ip addr add 2001:638:709:f::f4:f1/64 dev f1-eth2")
    f2.cmd("ip addr add 2001:638:709:f::f1:f2/64 dev f2-eth1")
    f2.cmd("ip addr add 2001:638:709:f::f3:f2/64 dev f2-eth2")
    f3.cmd("ip addr add 2001:638:709:f::f2:f3/64 dev f3-eth1")
    f3.cmd("ip addr add 2001:638:709:f::f4:f3/64 dev f3-eth2")
    f4.cmd("ip addr add 2001:638:709:f::f3:f4/64 dev f4-eth1")
    f4.cmd("ip addr add 2001:638:709:f::f1:f4/64 dev f4-eth2")

    # Topology of ISP 'e':

    b1 = net.addHost('b1', ip=None)
    b2 = net.addHost('b2', ip=None)
    b3 = net.addHost('b3', ip=None)
    b4 = net.addHost('b4', ip=None)

    e1 = net.addHost('e1', ip=None)
    e1.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")
    e2 = net.addHost('e2', ip=None)
    e2.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")
    e3 = net.addHost('e3', ip=None)
    e3.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")
    e4 = net.addHost('e4', ip=None)
    e4.cmd("sysctl -w net.ipv6.conf.all.forwarding=1")

    net.addLink(b1, e1)
    net.addLink(b2, e2)
    net.addLink(b3, e3)
    net.addLink(b4, e4)

    net.addLink(e1, e2)
    net.addLink(e2, e3)
    net.addLink(e3, e4)
    net.addLink(e4, e1)

    b1.cmd("ip addr add 2001:638:709:b1::1/64 dev b1-eth0")
    b1.cmd("ip route add default via 2001:638:709:b1::e1 dev b1-eth0")
    b2.cmd("ip addr add 2001:638:709:b2::1/64 dev b2-eth0")
    b2.cmd("ip route add default via 2001:638:709:b2::e2 dev b2-eth0")
    b3.cmd("ip addr add 2001:638:709:b3::1/64 dev b3-eth0")
    b3.cmd("ip route add default via 2001:638:709:b3::e3 dev b3-eth0")
    b4.cmd("ip addr add 2001:638:709:b4::1/64 dev b4-eth0")
    b4.cmd("ip route add default via 2001:638:709:b4::e4 dev b4-eth0")

    e1.cmd("ip addr add 2001:638:709:b1::e1/64 dev e1-eth0")
    e2.cmd("ip addr add 2001:638:709:b2::e2/64 dev e2-eth0")
    e3.cmd("ip addr add 2001:638:709:b3::e3/64 dev e3-eth0")
    e4.cmd("ip addr add 2001:638:709:b4::e4/64 dev e4-eth0")

    e1.cmd("ip addr add 2001:638:709:e::e2:e1/64 dev e1-eth1")
    e1.cmd("ip addr add 2001:638:709:e::e4:e1/64 dev e1-eth2")
    e2.cmd("ip addr add 2001:638:709:e::e1:e2/64 dev e2-eth1")
    e2.cmd("ip addr add 2001:638:709:e::e3:e2/64 dev e2-eth2")
    e3.cmd("ip addr add 2001:638:709:e::e2:e3/64 dev e3-eth1")
    e3.cmd("ip addr add 2001:638:709:e::e4:e3/64 dev e3-eth2")
    e4.cmd("ip addr add 2001:638:709:e::e3:e4/64 dev e4-eth1")
    e4.cmd("ip addr add 2001:638:709:e::e1:e4/64 dev e4-eth2")

    # Create some peering links...

    net.addLink(f2, e1)
    net.addLink(f3, e4)

    f2.cmd("ip addr add 2001:638:709:f::f2 dev f2-eth3")
    e1.cmd("ip addr add 2001:638:709:e::e1 dev e1-eth3")
    f3.cmd("ip addr add 2001:638:709:f::f3 dev f3-eth3")
    e4.cmd("ip addr add 2001:638:709:e::e4 dev e4-eth3")

    # Kick off the bird routing daemons...

    f1.cmd("bird6 -c ./f1-bird.conf -s /var/run/f1-bird.ctl")
    f2.cmd("bird6 -c ./f2-bird.conf -s /var/run/f2-bird.ctl")
    f3.cmd("bird6 -c ./f3-bird.conf -s /var/run/f3-bird.ctl")
    f4.cmd("bird6 -c ./f4-bird.conf -s /var/run/f4-bird.ctl")

    e1.cmd("bird6 -c ./e1-bird.conf -s /var/run/e1-bird.ctl")
    e2.cmd("bird6 -c ./e2-bird.conf -s /var/run/e2-bird.ctl")
    e3.cmd("bird6 -c ./e3-bird.conf -s /var/run/e3-bird.ctl")
    e4.cmd("bird6 -c ./e4-bird.conf -s /var/run/e4-bird.ctl")

    net.start()
    CLI(net)

    # Shutdown the bird routing daemons...

    f1.cmd("birdc6 -s /var/run/f1-bird.ctl down")
    f2.cmd("birdc6 -s /var/run/f2-bird.ctl down")
    f3.cmd("birdc6 -s /var/run/f3-bird.ctl down")
    f4.cmd("birdc6 -s /var/run/f4-bird.ctl down")

    e1.cmd("birdc6 -s /var/run/e1-bird.ctl down")
    e2.cmd("birdc6 -s /var/run/e2-bird.ctl down")
    e3.cmd("birdc6 -s /var/run/e3-bird.ctl down")
    e4.cmd("birdc6 -s /var/run/e4-bird.ctl down")

    net.stop()

Это мои файлы конфигурации:

# f1-bird.conf

include "common-bird.conf";

router id 1.1.1.1;

protocol static {
    route 2001:638:709:a1::/64 via "f1-eth0";
}

protocol ospf F {

    import all;
    export all;
    area 0 {
        networks {
            2001:638:709:f::/64;
        };
        interface "f1-eth1" {};
        interface "f1-eth2" {};
    } 
}

# f2-bird.conf

include "common-bird.conf";

router id 1.1.1.2;

protocol static {
    route 2001:638:709:a2::/64 via "f2-eth0";
    route 2001:638:709:e::/64 via "f2-eth3";
}

protocol ospf F {

    import all;
    export all;
    area 0 {
        networks {
            2001:638:709:f::/64;
        };
        interface "f2-eth1" {};
        interface "f2-eth2" {};
    } 
}

# f3-bird.conf

include "common-bird.conf";

router id 1.1.1.3;

protocol static {
    route 2001:638:709:a3::/64 via "f3-eth0";
    route 2001:638:709:e::/64 via "f4-eth3";
}

protocol ospf F {

    import all;
    export all;
    area 0 {
        networks {
            2001:638:709:f::/64;
        };
        interface "f3-eth1" {};
        interface "f3-eth2" {};
    } 
}

# f4-bird.conf

include "common-bird.conf";

router id 1.1.1.4;

protocol static {
    route 2001:638:709:a4::/64 via "f4-eth0";
}

protocol ospf F {

    import all;
    export all;
    area 0 {
        networks {
            2001:638:709:f::/64;
        };
        interface "f4-eth1" {};
        interface "f4-eth2" {};
    } 
}