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Re: VE with veth, using MAC address it shouldn't be aware of [message #10143 is a reply to message #10047]

Fri, 09 February 2007 12:07

Andrey Mirkin
Messages: 193
Registered: May 2006

Senior Member

I'm sorry for not answering so long.
Right now I have only one explanation of this bug - the problem actually in tcpdump:
1. tcpdump gets information that veth received packet.
2. packet passes through route table and source MAC address in this packet is changed to eth0 MAC address.
3. tcpdump shows packet with changed MAC address.

tcpdump doesn't copy packet when receive it, that is why it shows changed packet.

Usually packets are copied before routing, but this doesn't performed for veth and venet devices due to optimization (reduce overhead).

Actually I was not able to reproduce this bug on the same configuration. What version of tcpdump do you use?

Andrey Mirkin

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[Message index]

		SOLVED VE with veth, using MAC address it shouldn't be aware of By: samlt on Sun, 04 February 2007 10:02
		Re: VE with veth, using MAC address it shouldn't be aware of By: Andrey Mirkin on Mon, 05 February 2007 11:08
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Mon, 05 February 2007 16:02
		Re: VE with veth, using MAC address it shouldn't be aware of By: Andrey Mirkin on Mon, 05 February 2007 16:18
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Mon, 05 February 2007 17:43
		Re: VE with veth, using MAC address it shouldn't be aware of By: Andrey Mirkin on Tue, 06 February 2007 11:03
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Tue, 06 February 2007 11:44
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Thu, 08 February 2007 18:33
		Re: VE with veth, using MAC address it shouldn't be aware of By: Andrey Mirkin on Fri, 09 February 2007 12:07
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Fri, 09 February 2007 16:20
		Re: VE with veth, using MAC address it shouldn't be aware of By: Andrey Mirkin on Fri, 09 February 2007 17:17
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Fri, 09 February 2007 18:41
		Re: VE with veth, using MAC address it shouldn't be aware of By: Andrey Mirkin on Fri, 09 February 2007 23:00
		Re: VE with veth, using MAC address it shouldn't be aware of By: samlt on Sat, 10 February 2007 01:31

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