Date: Thu, 26 Oct 2000 20:30:57 -0600 (MDT) From: Nick Rogness <nick@rapidnet.com> To: John Telford <j.telford@sympatico.ca> Cc: freebsd-net@FreeBSD.ORG Subject: Re: Multihomed natd, nics and default gateways continued. Message-ID: <Pine.BSF.4.21.0010262011060.29371-100000@rapidnet.com> In-Reply-To: <002601c03fa5$a760da30$0100000a@johnny5>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, 26 Oct 2000, John Telford wrote:
> Nick,
> You are wise in the ways of FreeBSD and routing. Could you take a moment and provide some tips on how I could expand on your help to John Prince ?
> I have a similar setup but would like it to behave slightly differently. My setup:
> 1 internal interface.
> 1 external interface doing natd, default gateway routing for the internal to an isp.
> We have now brought in a second ISP and put a 3rd interface into the Freebsd box. I'd like to have a setup like this:
>
> ISPA-----------interface A_fxp0
> fxp2_NATD--interface C---------internal network 10.130.x.x
> ISPB-----------interface b_fxp1
>
> I would like to have all internal -> external traffic route through
> ISPA. In the event that ISPA goes down then the ISPB connection should
> take over automatically with out the users noticing except that things
> are slower because ISPB is a slower connection. This means the default
> gateway would have to change on the fly and I can't seem to locate
> much information on how this can work.
For ipfw:
#Divert traffic from internal out and in interface ISP A
ipfw add 101 divert natd ip from any to any via $fxp0
#Divert traffic from internal network in and out ISP B
ipfw add 201 divert natd2 ip from any to any via $INTERFACE_A
#Leave on for testing until it works
ipfw add 3000 allow ip from any to any
For natd:
Then after you do that setup the 2 different natd`s to listen on
different ports (default 8668) and another entry int
/etc/services:
natd2 8669/divert # Network Address Translation
Then run the nat`s seperately:
root# natd -p 8668 -n fxp0
root# natd -p 8669 -n fxp1
For routing:
Add 2 default routes, one primary (ISP A) and one backup (ISP
B). Since ISP A is a prefered route...it gets the more specific
route:
root# route add -net 0.0.0.0 $GATEWAY_IP_ISP_A -netmask 128.0.0.0
root# route add -net 128.0.0.0 $GATEWAY_IP_ISP_A -netmask 128.0.0.0
root# route add -net 0.0.0.0 $GATEWAY_IP_ISP_B -netmask 0.0.0.0
Nick Rogness
- Drive defensively. Buy a tank.
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-net" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.21.0010262011060.29371-100000>