[afnog] Multiple Gateways on a Server

[Bruce Zamaere]

Fabian,

I considered this... but as this is a 'server farm' I didn't think it
was appropriate. It would simply complicate matters and increase
headaches for the admins. I also want both routers on the same block
and I'm not sure if this suggestion would allow that.



On 9/24/07, Fabian <fabian at udsm.ac.tz> wrote:
> Pretty Possible Bruce,
>
> You need to have two interfaces in that linux box.....
>
> One interface give it an IP from one router (network block)....like wise the
> other interface give it an IP from the second router (second network block).
>
>
> Add these commands  in the /etc/rc.local file
>  route add -net a.b.c.0 netmask 255.255.255.0 default gw a.b.c.1
>  route add -net d.e.f.0 netmask 255.255.255.0 default gw d.e.f.1
>
>
> note:
> 1. a.b.c.0 should network ID for one network block
> 2. d.e.f.0 should network ID for another network block
> 3. 255.255.255.0 is netmask for each network block, here I have assumed each
> network block has 255.255.255.0 netmask.
>
> Try it out,
>
> Arbogast.I.Fabian,
> Senior Network Engineer,
> University Computing Centre,
> P.O Box 35062,
> Dar Es Salaam.
> Phone:+255-22-241-0641
> Fax:    +255-22-241-0690
> Cell:    +255-78-447-8387
> -----Original Message-----
> From: afnog-bounces at afnog.org [mailto:afnog-bounces at afnog.org] On Behalf Of
> Bruce Zamaere
> Sent: Monday, September 24, 2007 6:14 PM
> To: afnog at afnog.org
> Subject: [afnog] Multiple Gateways on a Server
>
> Now this may sound a bit foolish but I'm really curious if this can work.
>
>
>                                      +-------------+
>                                      |    R0          |
>                                      +-------------+
>                                               |
>       +----------------------------------------------------------
>        |
>          |
>        |
>          |
> +-------------+
> +-------------+
> |    R1          |
> |    R2          |
> +-------------+
> +-------------+
>        |
>           |
>        |
>           |
> |---------------------------------------------------------------------------
> -|
>                                               |
>                                               |
>                                          +-----+
>                                          |        |
>                                          | ----  |
>                                          | ----  |
>                                          | ----  |
>                                          |        |
>                                          +-----+
>                                          Server
>
>
> Hope the ascii drawing looks alright. Simply put. I have a server farm
> that is on a lan with two routers. I want to be able to configure the
> servers to use both routers. Load balancing or load sharing isn't
> really a concern here. Is it possible to have two default gateways for
> these servers? Servers are running Linux... routers are all Cisco.
>
> regards,
>
> Bruce.
>
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