[Babel-users] v4-via-v6 with babeld

[Juliusz Chroboczek]

A route across three IPv6-only nodes:

    $ ip route show 10.0.0.2
    10.0.0.2 via inet6 fe80::216:3eff:fe00:1 dev lxcbr0 proto babel onlink

Here's how it's logged by babeld:

    10.0.0.2/32 from 0.0.0.0/0 metric 384 (384) refmetric 288 id 02:16:3e:ff:fe:9a:5e:22 seqno 36425 chan (255) age 15 via lxcbr0 neigh fe80::216:3eff:fe00:1 (installed)

Traceroute is a little confusing:

    $ traceroute 10.0.0.2
    traceroute to 10.0.0.2 (10.0.0.2), 30 hops max, 60 byte packets
     1  192.0.0.8 (192.0.0.8)  0.079 ms  0.019 ms  0.014 ms
     2  192.0.0.8 (192.0.0.8)  0.040 ms  0.023 ms  0.042 ms
     3  192.0.0.8 (192.0.0.8)  0.061 ms  0.030 ms  0.030 ms
     4  10.0.0.2 (10.0.0.2)  0.060 ms  0.040 ms  0.039 ms

PMTUD works fine (thanks to Toke):

    19:58:47.402871 IP 192.168.0.27.60046 > 10.0.0.2.22: Flags [.], seq 33:1481, ack 33, win 502, options [nop,nop,TS val 917354570 ecr 1849974691], length 1448
    19:58:47.402874 IP 192.168.0.27.60046 > 10.0.0.2.22: Flags [P.], seq 1481:1537, ack 33, win 502, options [nop,nop,TS val 917354570 ecr 1849974691], length 56
    19:58:47.402906 IP 192.0.0.8 > 192.168.0.27: ICMP 10.0.0.2 unreachable - need to frag (mtu 1420), length 556
    19:58:47.402919 IP 10.0.0.2.22 > 192.168.0.27.60046: Flags [.], ack 33, win 509, options [nop,nop,TS val 1849974692 ecr 917354569,nop,nop,sack 1 {1481:1537}], length 0
    19:58:47.402934 IP 192.168.0.27.60046 > 10.0.0.2.22: Flags [.], seq 33:1401, ack 33, win 502, options [nop,nop,TS val 917354570 ecr 1849974692], length 1368

-- Juliusz