On Aug 13, 2007, at 4:59 PM, Modulok wrote:
QUESTION: Is there a way to setup a redundant router, such that I can
offload traffic from the primary router to another machine, without
breaking TCP sessions?

There are several ways of setting up such redundancy; the common case which Cisco calls VRRP, you can use under FreeBSD as CARP. However, this approach is limited to pure routing; it does not handle replicating the NAT state tables:

BACKGROUND: I have a FreeBSD machine acting as a gateway, running
natd(8) through ipfw(8).

...which you mention you are using. I don't know of any way to provide redundancy for existing connections going via natd.

--
-Chuck

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