Date: Mon, 14 Jun 1999 17:54:12 -0600 From: Wes Peters <wes@softweyr.com> To: star@iwl.net Cc: hackers@FreeBSD.ORG Subject: Re: NAT Gateway to multiple ISPs Message-ID: <37659624.3A6B8F9C@softweyr.com> References: <199906141306.IAA12874@star1.iwl.net>
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star@iwl.net wrote:
>
> Any ideas on the following ?
>
> I am setting up a home/office network with NAT filtering gateway
> on a dual-NIC FreeBSD 3.2 box. No problem so far - I've set
> up several like this on 2.2.8 using natd.
>
> The new wrinkle is this: I need to connect to two ISPs
> (DSL & Cable Modem), ideally with automatic failover and
> load balancing when multiple internal PC's are generating
> internet traffic.
>
> I know that this requires running gated (or routed) to
> receive RIP or OSPF messages from the ISPs, and to select the
> best outgoing ISP's route.
>
> The key question is: while the routing program probably
> requires a third NIC so that each external link has its own
> device, how can natd handle multiple external internet
> interfaces.
You could certainly (and easily) do it with *two* FreeBSD boxes:
+----------+ +----------+
Cable -->| Router | | Firewall |
| Gated+ |<---->| natd+ |<-- internal network
DSL -->| FreeBSD | | FreeBSD |
+----------+ +----------+
I'm not sure it is possible to virtualize the connection between the
"router" and "firewall" above. Perhaps with a clever (ab)use of the
bridging code.
--
"Where am I, and what am I doing in this handbasket?"
Wes Peters Softweyr LLC
http://www.softweyr.com/~softweyr wes@softweyr.com
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