multipath static route issue or my mistake?

[Ondrej Zajicek]

On Fri, Dec 23, 2011 at 10:38:37AM +0700, Ebed wrote:
> List,
> 
> I'm doing a lab using bird, i have 192.168.0.0/16, that it consists of
> 192.168.0.0/24 and 192.168.1.0/24 which will connect to the internet
> with usb modem0 and usb modem1. I'm trying to add in the protocol static,
> 
>     route 0.0.0.0/0 multipath via "modem0" via "modem1"
> 
> it's failed. Finally i'm using these configs,
> 
>     route 0.0.0.0/0 "modem0"
>     route 0.0.0.0/0 "modem1"
> 
> My isp which connected through "modem0" sometimes is suck, the signal
> always goes up and down, when the signal is good, the modem0 will
> connect with no problem but when it's bad, it will dissapear. So my
> question is,
> 
> 1. Can we route mutiple provider using just the device name not actual
> ip as i get dynamic ip on modem0 and modem1?
> 2. Can we set multipath using the first config above while the actual
> device is missing (modem0)?

BIRD currently does not support multipath device routes, that is the
reason why the first config abode does not work.

I don't know about your network setting, whether the modem0/1
are just some kind of ptp interfaces (it seems strange to me
to use /24 for that) and whether default route in your case
should be configured with or without next hop IP address.
If you could specify next hop IP addresses, you could get
working multipath route (in static proto) like:

  route 0.0.0.0/0 multipath via 192.168.0.1 via 192.168.1.1;

It is irrelevant whether interfaces sometimes disappear.

The second config (two independent route lines) has a problem that
static protocol currently assumes there is just one specified route for
one network (so it would probably not work as expected). But you could
use more static protocols:

protocol static STATIC0 {
   check link yes;
   import all;

   route 0.0.0.0/0 via "modem0";
}

protocol static STATIC1 {
   check link yes;
   import all;

   route 0.0.0.0/0 via "modem1";
}

This will work (but not as multipath, it will just switch to the other
route if one disappear).


-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
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