[afnog] Multiple Gateways on a Server

[Fabian]

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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