Something with filters
jeroen at massar.ch
Wed Aug 27 18:01:43 CEST 2014
I was doing some traceroutes to determine some weird claim of a transit
(not shown in the below trace) being "tier1" while another transit
actually popped up in their network and then noticed this beauty:
9 2001:5a0:a00::2e (2001:5a0:a00::2e) 79.018 ms 79.910 ms 79.960 ms
10 :: (::) 101.893 ms 102.004 ms 103.574 ms
11 rar3.chicago-il.us.xo.net (::ffff:220.127.116.11) 104.732 ms
Yeah baby, we can use the unspecified address in ICMP replies!
Why oh why is that packet even allowed to come back to me, let alone
travel all those hops...
Oh, yeah, something with uRPF and other such awesome standards.
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