[afnog] Multiple Gateways on a Server

[Bruce Zamaere]

Fabian,

Sorry about this... but you assuming that I have a second nic on all
my servers in the server farm? Please see Mark's post on this thread I
think its a more elegant solution for my problem.

best regards,

Bruce.

On 9/25/07, Fabian <fabian at udsm.ac.tz> wrote:
> Bruce...
>
> If I got you right in your first message....it's JUST OK with this.
>
>
> What do you mean by complications?! I think it will easy work and ensure
> maximum availability....'cause doing that is having alternative routes
> (failover routes) to your servers which is healthy!
>
> I think you need to give this job to your network guys.....i'm telling you
> something I have implemented in my network on our mail exchangers.
>
> Just add the lines...sit back and relax...
>
>
> 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.
>
>
> 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 7:52 PM
> To: afnog at afnog.org
> Subject: Re: [afnog] Multiple Gateways on a Server
>
> 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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> > http://afnog.org/mailman/listinfo/afnog
> >
> >
>
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