On 06/19/2017 08:51 AM, Ken D'Ambrosio wrote:
Hi, all. We've got two Canonical Newton installs using VLANs and we're
having intermittent issues we simply can't figure out. (Note that a
third installation using flat networks is not having this issue.)
Floating IPs set up and work... sporadically.
* Stateful connections (e.g., SSH) often drop after seconds of use to
both the FIP and when SSH'd in from the
* We see RSTs in our TCP dumps
* Pings work for a while, then don't.
* We see lots of ARP requests -- even one right after another -- to
resolve hosts on the internal subnets:
05:43:25.859448 ARP, Request who-has 80.0.0.3 tell 80.0.0.1, length 28
05:43:25.859563 ARP, Reply 80.0.0.3 is-at fa:16:3e:28:af:77, length 28
05:43:25.964417 ARP, Request who-has 80.0.0.3 tell 80.0.0.1, length 46
05:43:25.964572 ARP, Reply 80.0.0.3 is-at fa:16:3e:28:af:77, length 28
05:43:26.963989 ARP, Request who-has 80.0.0.3 tell 80.0.0.1, length 46
05:43:26.964156 ARP, Reply 80.0.0.3 is-at fa:16:3e:28:af:77, length 28
Was that run with '-i any' or on a single interface? I would check the
ARP cache to make sure things entries are in a complete/reachable state.
Or even syslog for any other errors.
80.0.0.1 is the qrouter. I can't imagine why it asked -- and was ACK'd
in each case -- three times in just over a second. In hindsight, I
should have checked to have seen if the ACK showed up in the qrouter's
ARP table. Next time...
I'd also specify -e to tcpdump to see the MACs involved. Possibly there
is something else configured with the same IP on the VLAN (shouldn't
happen, but worth checking).
-Brian
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