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Date:      Thu, 10 Sep 1998 16:56:23 +0200
From:      Arve Ronning <arve.ronning@thomson-csf.no>
To:        hg@glaess.ndh.com
Cc:        freebsd-isdn@FreeBSD.ORG
Subject:   Re: i4b and routing
Message-ID:  <35F7E897.F5C548BA@thomson-csf.no>
References:  Pine.LNX.3.96.980910135537.2024D-100000@glaess.evkkk.de

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hg@glaess.ndh.com wrote:
> 
> hi,
> ich noch mal ...... ;-)
> 
> also ich versteh so einiges nicht ......
> 
> i4b leauft ! aber ein routing kommt erst zu stande wenn ich per hand
> 2 netzrouten zusaetlich setze . ist das IO so ?
> ich denke FreeBSD macht das automatisch  ?
>
It will, if you use NAT and IPFW
> 
> zum zeiten kann ich mit meinem 2ten rechner den bsd anpingen und telneten
> aber ich komme von ihm nicht in das internet .
> 
> probiert habe ich es schon in jeglicher form mit nat ohne nat
> mit firewall , ohne bzw. mit oder ohne allem .
> 
> tcpdump sieht den icmp request aber es kommt kein reply.
> 
> help please.
> 
You will have to excuse my German :)

I understand you try to use your FreeBSD box as a router in order
to get in touch with the InterNet from a second box connected to
the FreeBSD box through some sort of local network.

To do this, you will have to:

1)	Configure the second box to use the FreeBSD box as the default
	gateway

2)	Configure the FreeBSD box kernel to act as a gateway.
	Set GATEWAY="YES" in /etc/rc.conf (I believe) and 
	make a new /kernel

3)	Set up natd with ipfw (on the FreeBSD box) to do address 
	translation on outgoing IP packets from the local address 
	to the address supplied by your ISP and to translate 
	back the incoming replies.

I suspect step 3) is what's failing in your case, because the current
versions of I4B do not inform NATD of the new address when it arrives
during call setup to your ISP. One way of doing this (as I discovered
after receiving help from the I4B gang:) is to 'kill -HUP' NATD _after_
the call has been set up. This can be automated.

Another way of getting NATD updated is to wait for the next version
of I4B and install that. I think there is a patch for this exact
purpose on it's way.

Good luck !
  -Arve

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