Re: Kernel Routing sequence

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On Tue, Aug 09, 2005 at 10:38:21AM +0300, Al Boldi wrote:
> Kernel IP routing table
> Destination	Gateway	Genmask		Flags	Iface
> 10.0.0.1		0.0.0.0	255.255.255.255 UH		eth0
> 10.0.1.1		0.0.0.0	255.255.255.255 UH		eth1
> 10.0.0.0		0.0.0.0	255.255.255.0	  U		eth0
> 10.0.1.0		0.0.0.0	255.255.255.0	  U		eth1
> 10.0.0.0		0.0.0.0	255.0.0.0		  U		eth0
> 127.0.0.0		0.0.0.0	255.255.255.0	  U		lo
> 
> Why does the Kernel route a packet from
> 10.0.1.2 netmask 255.0.0.0 out to eth1?

Neither packet source address nor netmask do affect the routing
decision. It is only done based on the target address.

ip route list match <target-address>

is a big helper on systems that have iproute installed.

Greetings
Marc

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