ARP Reply with wrong MAC

ARP Reply with wrong MAC

[Sebastian]

A Linux box (kernel 2.4.24) with 2 ethernet interfaces connected to the same
physical backbone. eth0 (public IP) and eth1 (10.0.0.1).

Sometime it ocures that an arp-request for 10.0.0.1 is answered with the
mac-address of eth0. (proxy_arp on all interfaces is off)

Did anybody got a same problem and/or a solution?

Greets
  Sebastian.

Re: ARP Reply with wrong MAC

[Cedric Blancher]

Le mardi 14 décembre 2004 à 10:27 +0000, Sebastian a écrit :
> A Linux box (kernel 2.4.24) with 2 ethernet interfaces connected to the same
> physical backbone. eth0 (public IP) and eth1 (10.0.0.1).
> Sometime it ocures that an arp-request for 10.0.0.1 is answered with the
> mac-address of eth0. (proxy_arp on all interfaces is off)

One which interface this request is received ? If it's eth0, then it's
normal.

BTW, what's the connection with Netfilter ?


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Re: ARP Reply with wrong MAC

[George Ross]

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> A Linux box (kernel 2.4.24) with 2 ethernet interfaces connected to the same
> physical backbone. eth0 (public IP) and eth1 (10.0.0.1).

It might be easier just to give one of those interfaces two addresses.

> Sometime it ocures that an arp-request for 10.0.0.1 is answered with the
> mac-address of eth0. (proxy_arp on all interfaces is off)
> 
> Did anybody got a same problem and/or a solution?

http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.arp_problem.html
has a useful discussion of some arp problems.
-- 
Dr George D M Ross, School of Informatics, University of Edinburgh
    Kings Buildings, Mayfield Road, Edinburgh, Scotland, EH9 3JZ
Mail: gdmr@inf.ed.ac.uk   Voice: +44 131 650 5147   Fax: +44 131 667 7209
 PGP: 1024D/AD758CC5  B91E D430 1E0D 5883 EF6A  426C B676 5C2B AD75 8CC5



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Re: ARP Reply with wrong MAC

[George Alexandru Dragoi]

That's nothing, I have similar with 4 ether cards in same switch (port
trunking). Seems to be ok, even i get 4 answer to an arp request to
that box :)


On Tue, 14 Dec 2004 11:00:05 +0000, George Ross <gdmr@inf.ed.ac.uk> wrote:
> > A Linux box (kernel 2.4.24) with 2 ethernet interfaces connected to the same
> > physical backbone. eth0 (public IP) and eth1 (10.0.0.1).
> 
> It might be easier just to give one of those interfaces two addresses.
> 
> > Sometime it ocures that an arp-request for 10.0.0.1 is answered with the
> > mac-address of eth0. (proxy_arp on all interfaces is off)
> >
> > Did anybody got a same problem and/or a solution?
> 
> http://www.austintek.com/LVS/LVS-HOWTO/HOWTO/LVS-HOWTO.arp_problem.html
> has a useful discussion of some arp problems.
> --
> Dr George D M Ross, School of Informatics, University of Edinburgh
>     Kings Buildings, Mayfield Road, Edinburgh, Scotland, EH9 3JZ
> Mail: gdmr@inf.ed.ac.uk   Voice: +44 131 650 5147   Fax: +44 131 667 7209
>  PGP: 1024D/AD758CC5  B91E D430 1E0D 5883 EF6A  426C B676 5C2B AD75 8CC5
> 
> 
> 


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