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Message-ID: <20111201144745.GK589422@jupiter.n2.diac24.net>
Date:	Thu, 1 Dec 2011 15:47:45 +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 Thu, Dec 01, 2011 at 08:39:07AM -0600, Greg Scott wrote:
> I wonder what's different this morning?  A bunch of firewall conntrack
> entries would have expired by now.  I was changing rules fast and
> furious last night, maybe there were some stale conntrack entries that
> messed with my head.  But this morning it's working as expected.
> 
> Must be an important project, otherwise it wouldn't give me all this
> trouble.

Heh. Nice to see you got it to work.

A few last words about the subnet mask on the windows box:

The 1.2.115.144/28 subnet is on eth0 on your router. The windows host
with 1.2.115.157 is _not_ connected to that subnet. It is on eth1 on
your router, and it can't reach any hosts from 1.2.115.144/28 without
going through your router, so /32 is the correct configuration there.

That /32 just means "on my ethernet segment i'm alone with that
address". If the windows box has /28 as subnet mask, it will try to ARP
for other hosts from that subnet, instead of going through the router.
So, that'll break connectivity to them...


-David
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