bind & connect

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Neels Hofmeyr nhofmeyr at sysmocom.de
Sun Oct 16 22:57:35 UTC 2016


On Mon, Oct 17, 2016 at 12:13:19AM +0200, Harald Welte wrote:
> On Sun, Oct 16, 2016 at 11:55:33PM +0200, Neels Hofmeyr wrote:
> 
> > So normally when I send something, the routing table (ip r show) determines
> > which local interface the remote side sees as sender.
> 
> Yes.  Please note 'ip r show' will only show you 'table main'.  Since
> Linux 2.2.x (yes, ages ago) Linux supports and uses multiple routin
> tables.  See 'ip route show table all' to see all routes that exist in
> the stack.

yep, that was a gotcha when I started to get used to Freifunk -- scratching my
head at the main table until I saw a hundred more routes in tables 'olsr' and
'olsr-default' (and having to fix the table priorities...)

[...]
> See http://linux-ip.net/html/routing-saddr-selection.html
[...]
> So something like 'ip route add 8.8.8.8/32 via 192.168.100.1 src 1.2.3.4'
> will teach the routing table to choose the local source address 1.2.3.4
> whenever sending packets to 8.8.8.8 and route them via the gateway
> 192.168.100.1.  This configuration is valid system-wide, for all
> applications/sockets.  Please note that 1.2.3.4 must be a valid local
> address (i.e. one that has been added using 'ip addr add 1.2.3.4 ...'
> before.

Thanks for the excellent explanation and link!
It's very clear to me now.

-- 
- Neels Hofmeyr <nhofmeyr at sysmocom.de>          http://www.sysmocom.de/
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