Date: Tue, 15 Jun 1999 00:40:58 +0100 From: Brian Somers <brian@Awfulhak.org> To: star@iwl.net Cc: hackers@FreeBSD.ORG Subject: Re: NAT Gateway to multiple ISPs Message-ID: <199906142340.AAA47618@keep.lan.Awfulhak.org> In-Reply-To: Your message of "Mon, 14 Jun 1999 08:06:14 CDT." <199906141306.IAA12874@star1.iwl.net>
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>
> 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.
[.....]
> 3) Configure an internal pseudo-device (tun ?) or divert
> interface between natd (and the internal NIC) on the inside
> and gated or routed (and the two external NICS) on the
> outside.
> This way, natd and the routing program would be completely
> isolated and wouldn't need to know that the other existed.
>
> ISP1 - NIC1
> \
> gated - TUN - natd - NIC3 - internal net
> / device
> ISP2 - NIC2
>
>
> The third seems the best choice, but I haven't seen any
> discription of this type of configuration.
Except of course for the working example I mailed you on June 9 and
committed to src/share/examples/ppp.
> Any advice ?
>
> Thanks very much for your help,
>
> Andy Starratt
--
Brian <brian@Awfulhak.org> <brian@FreeBSD.org>
<http://www.Awfulhak.org>; <brian@OpenBSD.org>
Don't _EVER_ lose your sense of humour ! <brian@uk.FreeBSD.org>
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