#arpnetworks 2016-12-26,Mon

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WhoWhatWhen
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brycecWell this is odd... IPv6 ssh traffic just broke for me.
ping still works, suggesting something somewhere fucked up with MTUs all of a sudden
I still need to dig into this. Just wondered if anyone else was seeing this with ARP? Or a home HE.net tunnel for that matter?
[12:14]
mercutioi've seen ipv6 mtu discovery not work
have you tried mss clamping?
[12:16]
brycecmss is clamped as I recall
What's weird is that "everything was working", meaning my SSH sessions were ticking along just fine. Then all of a sudden they hung... but not at the same time. (one hung at 12:09, the other at 12:10 according to the clock in tmux) so *something* *somehow* broke.
[12:21]
mercutiothey hung with large amounts of text?
or typing?
hmm my ipv6 tunnel seems to be working normally to arp
my tunnel is tserv3.fmt2
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brycecmercutio: Neither. They were both just sitting idle at prompts. Noticed they'd hung when I tried to type, then looked at the clock in my tmux bar on each session and it had frozen. [13:02]
mercutiothat doesn't sound mtu related
unless something spat lots of text at it
it sounds like what happens when something loses state for some reason
and is enforcing state.
[13:02]
brycecMore digging later - it's an HE issue and I can't hit anything IPv6 from my home tunnel. http://sprunge.us/TPPC
Reverse mtr from vps3 back towards my home connection showing that it gets lost somewhere within HE http://sprunge.us/JgIR
So it's an HE issue -- Sorry for the noise.
(The pings as it turns out were hitting the wrong addresses earlier, oops)
[13:06]
mercutioyou're in fmt2 too? [13:24]
brycecNo? sea1
*And no, https://tunnelbroker.net/status.php says no issues)
(
[13:26]
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mercutiohmm i wonder what it is/was [15:10]
brycecAccording to mtr, looks like all is well now. The missing node in both directions was 100ge14-1.core1.pdx1.he.net so I guess they had a brief routing issue.
(or router issue, technically)
Side-by-side comparison of mtrs in both directions, before and after http://sprunge.us/UcjD
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mercutioahh [15:57]
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nathanibrycec: do you use netflix over your he.net tunnel? [20:23]
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brycecLOL nope, no thanks to Netflix.
nathani: Not since Netflix classified HE as a proxy service.
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