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From: sabat <sabat@eloan.com>
To: lartc@vger.kernel.org
Subject: [LARTC] Redundant Routes to *Same* ISP
Date: Tue, 03 Dec 2002 18:52:23 +0000	[thread overview]
Message-ID: <marc-lartc-103895650511474@msgid-missing> (raw)

I've seen a lot of info about running redundant routes to different ISPs 
in the HOWTO and on this list. That surprises me, because I would expect 
that a more common situation would be redundant routes to the *same* ISP 
-- the typical HSRP + load balancing that so many of them run. Here's 
what I want to do:


======                ======
ISP Router 1 ---- HSRP ---- ISP Router 2
======  \          /  ======
      |            \   /          |
      |             / \           |
      |         /        \        |
====== /            \ ======
My Router 1 -- heartbeat -- My Router 2
   (Linux)                     (Linux)
======                ======
      |                           |
      |                           |
======                ======
     fw 1                        fw 2


I'm thinking of running ECMP outgoing from the routers labeled "My 
Router x" to the ISP routers. It's also probable that we'll have the 
ISP's routers sending us alternating (ECMP) packets on the incoming 
side. Our routers would have heartbeat running so that a failure on 
either box would cause the surviving router to take over its IP and MAC 
(VRRP is not a possibility for reasons not worth mentioning).

Two questions here:

- In some docs, I see mention of using SNAT on outgoing packets to keep 
a connection hooked up with one router. That's only necessary for 
multiple ISPs, right?

- Is this going to be more trouble than it's worth -- packet re-ordering 
or some other unforeseen problems?


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             reply	other threads:[~2002-12-03 18:52 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2002-12-03 18:52 sabat [this message]
2002-12-04  4:14 ` [LARTC] Redundant Routes to *Same* ISP William L. Thomson Jr.

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