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[The King in Yellow <yellowking@xxxxxxxxx>]

Sorry, replied directly:

---------- Forwarded message ----------
From: The King in Yellow <yellowking@xxxxxxxxx>
Date: Tue, Mar 5, 2013 at 12:56 PM
Subject: Re: [Openstack] Rebooted, now can't ping my guest
To: Sylvain Bauza <sylvain.bauza@xxxxxxxxxxxx>


In fact, when I ping 10.5.5.2, tcpdump on the network node actually shows
responses...

root@os-network:/var/log/quantum# tcpdump -i tap45ffdc5f-da host 10.5.5.5
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap45ffdc5f-da, link-type EN10MB (Ethernet), capture size
65535 bytes
:
12:50:12.936292 ARP, Request who-has os-network.local tell 10.5.5.5, length
28
12:50:12.936329 ARP, Reply os-network.local is-at fa:16:3e:36:2e:54 (oui
Unknown), length 28
12:50:14.936338 ARP, Request who-has os-network.local tell 10.5.5.5, length
28
12:50:14.936378 ARP, Reply os-network.local is-at fa:16:3e:36:2e:54 (oui
Unknown), length 28
12:50:15.936299 ARP, Request who-has os-network.local tell 10.5.5.5, length
28
12:50:15.936343 ARP, Reply os-network.local is-at fa:16:3e:36:2e:54 (oui
Unknown), length 28
12:50:16.936008 ARP, Request who-has os-network.local tell 10.5.5.5, length
28
12:50:16.936045 ARP, Reply os-network.local is-at fa:16:3e:36:2e:54 (oui
Unknown), length 28

above, pinging 10.5.5.1 ; below, pinging 10.5.5.2

12:50:17.044161 IP 10.5.5.5 > os-network.local: ICMP echo request, id
18433, seq 0, length 64
12:50:17.044222 IP os-network.local > 10.5.5.5: ICMP echo reply, id 18433,
seq 0, length 64
12:50:18.044399 IP 10.5.5.5 > os-network.local: ICMP echo request, id
18433, seq 1, length 64
12:50:18.044455 IP os-network.local > 10.5.5.5: ICMP echo reply, id 18433,
seq 1, length 64
12:50:19.044847 IP 10.5.5.5 > os-network.local: ICMP echo request, id
18433, seq 2, length 64
12:50:19.044899 IP os-network.local > 10.5.5.5: ICMP echo reply, id 18433,
seq 2, length 64
12:50:20.045370 IP 10.5.5.5 > os-network.local: ICMP echo request, id
18433, seq 3, length 64
12:50:20.045427 IP os-network.local > 10.5.5.5: ICMP echo reply, id 18433,
seq 3


Unfortunately, the CirrOS image 10.5.5.5 is using doesn't seem to have the
arp utility, nor does 'ip -n' work.  I guess it isn't getting the ARP
replies for 10.5.5.1, and somehow got an ARP entry for 10.5.5.2 and isn't
seeing the echo replies.  Seems to imply some sort of issue from the
network node back to him?

Found ARP entries via "cat /proc/1/net/arp," which seems to confirm that--
entry for 10.5.5.1 is 00:00:00:00:00:00.