Re: [LARTC] ip route src

[Ard van Breemen <ard@telegraafnet.nl>]

On Wed, May 29, 2002 at 08:54:43PM +0200, Arthur van Leeuwen wrote:
> The 'src' specifies which source address to choose in case a packet matching
> that routing rule does not have a source address yet. This may not seem
Are you sure it is that general?
If I am correct, it only applies to local unbound traffic.
> useful, until you realise that all outgoing packets generated on the local
> machine don't have a source address when routing...
That is also to general.
If you generate outgoing traffic, you have the option to bind the
source to an IP address, instead of "give me something default".

So: the src option changes the default source ip address of
outbound traffic going to the specified route.

If you have a multi homed system (meaning more than one ip
address for the same system), you can do a:
wget -SHO /dev/null http://www.telegraaf.nl/
and linux will choose an apropriate source address.

But if you have certain arrangements with somebody that delivers
content only to specific ip addressess, you can tell wget to use
a specific ip address:
wget --bind-address={a local ip address} -SHO /dev/null http://www.telegraaf.nl/
which will overrule the default address.

If you want to know what the default address will be for a
certain destination you can do this:
ip route get {destination}
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