pathgen.py

#!/usr/bin/env python3

PREFIX = "2001:470:19:a65:"
SUFFIX = "/64"
LEN = 14

print("brctl addbr pathgen")
print("ip link set pathgen up")
print("ip addr add %sffff:ffff:ffff:ffff%s dev pathgen" % (PREFIX, SUFFIX))

for i in range(1, LEN + 1):
    print("ip netns add ns%d" % i)
    print("ip link add ns%d type veth peer name ns%d-host" % (i, i))
    print("ip link set ns%d netns ns%d" % (i, i))
    print("ip link set ns%d-host up" % i)
    print("brctl addif pathgen ns%d-host" % i)
    print("ip netns exec ns%d ip link set lo up" % i)
    print("ip netns exec ns%d ip link set dev ns%d up" % (i, i))
    print("ip netns exec ns%d ip addr add %s:%d/64 dev ns%d" % (i, PREFIX, i, i))
    print("ip netns exec ns%d ip route add default via %sffff:ffff:ffff:ffff dev ns%d" % (i, PREFIX, i))
    print("ip netns exec ns%d sysctl -w net.ipv6.conf.all.forwarding=1" % i)
    if i != LEN:
        print("ip netns exec ns%d ip route add %s:%d via %s:%d dev ns%d" % (i, PREFIX, LEN, PREFIX, i + 1, i))