[NTLUG:Discuss] OT: BGP anyone? I've got two defaut routes and don't know which to choose.

[Chris Cox]

Look for gated (I think it will work with Linux) or bgpd (which seems
to be more popular for Linux)

> Jack Snodgrass wrote:
> 
> I have a PC ( network  actually, but let's just keep it simple. ) that has two T1
> connections
> to two different ISP networks. Both of the T1 routers ( Cisco 1720 ) are running BGP as
> set
> up by the ISP people. The network is set up so that the Class C addresses that we are
> using
> come in on either T1.  Getting to my network over either T1 from the internet is ok.
> 
> Going out is a different story. One option ( that I can think of ) is to use a Linux box
> that has
> access to both T1s. I'd like to have something ( BGP maybe ) that will let the system
> decide
> WHICH T1 to set up as the default route. Any machine on the network will specify the
> linux box as it's default route. The linux box will decide which T1 to use. Do I need to
> set up
> BGP... or is there something similar... but less complex/powerful that I'd should use
> instead?
> 
> One of the ISP Techs said that I could run ihbgp ( something like that ) between the two
> routers if I connected them up with a WIC card. Another ISP tech said that I would
> need a different, dual port Cisco router that I'd plug both T1s into. I don't know if
> either
> of them really knew what they were talking about.
> 
> I am 75% concerned with just Which Interface is up and operational. I'm 25% concerned
> with
> which interface is better for a particular conection or period in time.
> 
> I know that I can just set two default routes but I never have figured out which one is
> used.
> If one of the routes is 'unreachable', does it always go to the 'good' one or is it
> 50/50 or
> what?
> 
> Any info would be appreciated.
> 
> jack
> 
> 
>