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Date: Mon, 2 Jun 1997 12:52:56 +0000 ()
From: "Lenzi, Sergio" <lenzi@bsi.com.br>
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To: Almondale@aol.com
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: IP Masquerading
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On Sun, 1 Jun 1997 Almondale@aol.com wrote:

> The latest linux kernel includes support for IP Masquerading, so "private
> lans" can share a dialup gateway. What (if any) support does FreeBSD have for
> doing this. I have the most recent PPP binaries, but the routed command, when
> invoked with -q, returns "no route to hosts" or "can't assign requested
> address", and I get the effect described in the PPP manpages, namely the
> gateway host can see the internet via my ISP but *is not forwarding* packets
> back to my private LAN. I have invoked ppp with the -alias subcommand and
> given the static route to my ISDN-modem-equipped Freebsd (2.2.1) machine, but
> IP forwarding never seems to occur. I have even tried to remake the kernel
> using MROUTED, but it seems to me routed itself *ought* to work? Anybody with
> experience getting this setup to work?
> 
> Thanks,
> Alex
To use ip masquerading in FreeBSD use the ppp with the -alias keyword.

ppp -alias -auto xxx

ping anything.....
make it dial to your provider and assign a default route to it
and do the masquerading thing....

the file /etc/ppp/ppp.conf....

default:
 set device /dev/modem
 set speed 57600
 disable lqr
 deny lqr
 set redial 10 0
 set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" ATE1Q0 OK-AT-OK 
\\dATDT\
\T TIMEOUT 40 CONNECT"

xxx:
 set phone 555-6677
 set login "TIMEOUT 5 ogin:-\\r-ogin: aaa word: xxx"
 set timeout 180
 set ifaddr 0 1.1.1.1/0
 add 0 0 1.1.1.1


Sergio Lenzi.

Unix consult.