netdev - Re: ebtables on a stick

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Date:	Mon, 28 Nov 2011 16:30:02 +0100
From:	David Lamparter <equinox@...c24.net>
To:	Greg Scott <GregScott@...rasupport.com>
Cc:	David Lamparter <equinox@...c24.net>, netdev@...r.kernel.org
Subject: Re: ebtables on a stick

On Mon, Nov 28, 2011 at 08:54:09AM -0600, Greg Scott wrote:
> > This doesn't answer your question, but your use case is better solved
> > with proxy arp.
>
> ...But maybe there's a way to make my NIC only answer ARPs for certain IP Addresses I care about?  That would nicely solve the problem.  If it works.  

"ip neigh add proxy 1.2.3.4 dev eth0". Please look at the example i gave
you.

> In my earlier near-disaster, I did this:
> 
> echo 1 > /proc/sys/net/ipv4/conf/${INET_IFACE}/proxy_arp

NO. You do not touch this switch. Be afraid of this switch.

The instructions i gave you are complete. This switch is not involved.

> to turn on proxy arp.  I wonder if that ip neighbor stuff does it selectively?  

We already had this discussion in July.

"ip neigh add proxy" is independent of /proc/.../proxy_arp.


-David
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