Re: [LARTC] Failover with 2 ISP's and one ethernet card? (fwd)

["William L. Thomson Jr." <support@obsidian-studios.com>]

Simon,
        I have been working on a similar solution. To begin with you
need to
recompile the kernel with Julian's patches that can be found at 

http://www.linuxvirtualserver.org/~julian/#routes

and then read

http://www.linuxvirtualserver.org/~julian/nano.txt

I have yet to actually get this to work. Although I know from others
that is does. My problem is I have two SDSL routers doing NAT instead of
the linux router doing nat. That is why I am still having problems with
Julian's patches.

I am working on a double NAT solution but am having some problems I am
still trying to work out with NAT and 2.2 kernels. I am used to 2.4 and
iptables. Although ip route has some nice features that I have yet to
get to work. Like it's nat feature. But there is still ipchains and the
other 2.2 utilities.

Julian has been very gratious to respond directly to emails I have sent
him. Hopefully I will have a working solution soon and when I do will
definetly document and post my results. So far it's been a painful
learing process.

FYI, I am using a 2.2.21 kernel from kernel.org with the guts of the
Linux Router Project 2.9.8 with some other modifications.

Good luck, if you are able to achieve a working solution please post
your results. I may have a few questions as will others in the future.

Also you will need to setup split DNS here is another good link.

http://www.samag.com/documents/s\x1824/sam0201h/0201h.htm

On Sat, 2002-06-01 at 16:23, Simon Matthews wrote:
> I should add that my box is running Redhat 6.2 with a 2.2.19 series 
> kernel (it runs the standard RH kernel, but I can re-compile from the 
> standard kernel sources if required).
> 
> Simon
> 
> ---------- Forwarded message ----------
> Date: Sat, 1 Jun 2002 16:21:59 -0700 (PDT)
> From: Simon Matthews <simon@paxonet.com>
> To: lartc@mailman.ds9a.nl
> Subject: Failover with 2 ISP's and one ethernet card?
> 
> I am trying to figure out how to configure up a failover setup. I have 2 
> ISP's:
> 1. Wireless -- up to 2MPS
> 2. Fractional T1 -  384Kbps
> 
> So, I want the wireless interface to be used in preference. The T1
> connection comes into a Cisco 1605R router and from there into my external
> subnet. The Wireless connection comes straight in (I have no control over
> the ISP's router) to the external subnet.  The wireless ISP and T1-ISP
> provide different IP addresses to me. Furthermore, the wireless ISP does 
> not provide any routing protocol data (RIP, OSPF, etc) into my subnet. 
> 
> My proxy/mail/DNS box has one physical interface, and I want to define 
> multiple aliases, one for the address  provided by each ISP. 
> 
> Furthermore, I want my proxy box to failover to using the T1 connection if 
> the wireless connection goes down. 
> 
> I have tried to configure this, but the iproute2 commands do not seem to 
> accept alias names for the device (eg. eth0:2).
> 
> Can someone tell me how I should configure this setup?
> 
> Thanks!
> Simon
> 
> 
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> 
-- 
Sincerely,
William L. Thomson Jr.
Support Group
Obsidian-Studios Inc.
439 Amber Way
Petaluma, Ca. 94952
Phone  707.766.9509
Fax    707.766.8989
http://www.obsidian-studios.com

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