netdev - Re: loop back address question

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Message-ID: <alpine.LNX.2.01.1209231433560.9625@nerf07.vanv.qr>
Date:	Sun, 23 Sep 2012 14:37:39 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...i.de>
To:	ratheesh kannoth <ratheesh.ksz@...il.com>
cc:	netdev@...r.kernel.org
Subject: Re: loop back address question

On Tuesday 2012-09-18 15:42, ratheesh kannoth wrote:

>Hi ,
>
>i have two  linux machines(2.6.29 ) A & B, both  connected  to same lan network
>
>1)  if  i assign 127.0.2.1 and 127.0.2.2 to interfaces , can we ping
>each other ?  is there any way to  send packets out of interface ?

1. The route "local 127.0.0.0/8 dev lo" in the local table has a higher 
priority than the main table, so you would need to reorder that first.

2. There are a handful of places in linux where ipv4_is_loopback() is 
used on addresses to take a different path, so the chances to 
successfully get 127.0.2.0/24 packets out an interface may not be 100%.

Just in case you tried selling blocks out of your 127 block to someone..
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