From owner-freebsd-questions  Fri Jul 13  6:57:51 2001
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Date: Fri, 13 Jul 2001 16:57:02 +0300
From: Ruslan Ermilov <ru@FreeBSD.ORG>
To: Tao Huang <m0th@dcs.shef.ac.uk>
Cc: FreeBSD <freebsd-questions@FreeBSD.ORG>
Subject: Re: A question about how kernel choose the IP!
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In-Reply-To: <37CF5555FE9@broadstone.shef.ac.uk>; from m0th@dcs.shef.ac.uk on Fri, Jul 13, 2001 at 12:46:30PM -0800
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On Fri, Jul 13, 2001 at 12:46:30PM -0800, Tao Huang wrote:
> I have a question that how kernel choose the IP if there are more than one IP alias to one adaptor card?
> 
> I try several test as follow.
> 
> CASE 1:
> ifconfig xl0 inet 192.168.1.2 netmask 255.255.255.0
> ifconfig xl0 inet 192.168.1.3 netmask 255.255.255.255 alias
> route -n add -net 0 192.168.1.1
> 
> I found that the kernel choose 192.168.1.2 as the source IP for communication
> 
> CASE 2:
> ifconfig xl0 inet 192.168.2.2 netmask 255.255.255.0
> ifconfig xl0 inet 192.168.1.3 netmask 255.255.255.0 alias
> route -n add -net 0 192.168.1.1
> 
> in this case, i found the kernel choose 192.168.1.3 as the source IP for communication.
> 
> So, how does the kernel choose the source IP????????????
> 
Try that: route -vn get <destination>.


Cheers,
-- 
Ruslan Ermilov		Oracle Developer/DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
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