Skip to content

Instantly share code, notes, and snippets.

@cyyself

cyyself/pathgen.py

Created January 28, 2025 15:36
Show Gist options

  • Select an option

    Learn more about clone URLs
  • Save cyyself/19512b296d6d9a99cde529f02ba2c05c to your computer and use it in GitHub Desktop.

Select an option

Learn more about clone URLs
Save cyyself/19512b296d6d9a99cde529f02ba2c05c to your computer and use it in GitHub Desktop.
Download ZIP

Revisions

  1. cyyself created this gist Jan 28, 2025.
    23 changes: 23 additions & 0 deletions pathgen.py
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,23 @@
    #!/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))