[Bridge] [PROBLEM] mac address learned on wrong port
ser at man.szczecin.pl
Wed Apr 27 13:17:01 UTC 2016
On 26.04.2016 18:49, Stephen Hemminger wrote:
> This usualy happens when you either have a loop or packet leaks in from other port.
Yeah, it looks like a loop, but p2p1 is connected to a production network with
running MSTP, so I was sure there is no loop, but I have double checked it today
and I'm still sure there is no loop in the net outside of the server. To make it
super sure I have connected p2p1 to a dead end port (vlan with this one port
only) on a switch and the effect was the same - container's mac is learned on p2p1.
Could you explain what you mean by packet leaking in from other port?
I have one more clue:
when I do:
# arping -c1 ip-of-gateway
inside the container, then on host I can observe:
tcpdump -en -i vethV05BAQ ether src host 00:16:3e:aa:aa:66
14:57:17.528848 00:16:3e:aa:aa:66 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806),
length 42: Request who-has 18.104.22.168 tell 22.214.171.124, length 28
14:57:17.528915 00:16:3e:aa:aa:66 > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806),
length 60: Request who-has 126.96.36.199 tell 188.8.131.52, length 46
Two packets of same content, but different sizes. Difference is a padding of eth
frame to 64 bytes.
Does it mean something?
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