Rephrased: Routing problem

[Per olof Ljungmark <peo_(_at_)_intersonic_(_dot_)_se>]

I am not very good at expressing myself, I'll give it another shot.

Problem: How to add a route for the clients our internal network 
(192.168.1.0/24) to another network at 192.168.3.0/24.

The default gateway is set up with pf/nat and has three all-time 
interfaces, xl0,1,2 + tun0 over analog modem. There is also a VPN to 
192.168.2.0. Everything works fine except for the above.

tun0 is brought up by ppp like:
connection:
 add 192.168.3.0/24 HISADDR

Then , I can only accees the 192.168.3.0 network from the gateway, not 
from internal clients located in 192.168.1.0.

The host at other end is nt4 RAS.

Ultimately, I want to add autodial for tun0 so that when any client 
requests an adress within 192.168.3.0 the link is brought up.

Right now I'm clueless.

Per olof



Network:

                192.168.3.0
                   tun0 (dynamic ip)
                     |
intranet------xl2--obsd3.2--xl0-----the Internet + vpn to 192.168.2.0
192.168.1.0          |
                    xl1
                    DMZ


Part of routing table when tun0 is up:

Internet:
Destination        Gateway            Flags     Refs     Use    Mtu 
Interface
default            (public-ip)        UGS         5     8385      -   xl0
127/8              127.0.0.1          UGRS        0        0  33224   lo0
127.0.0.1          127.0.0.1          UH          2        0  33224   lo0
172.16.1/24        link#2             UC          0        0      -   xl1
192.168.1/24       link#3             UC          0        0      -   xl2
192.168.3/24       192.168.3.179      UGS         0        0   1500   tun0
192.168.3.179      192.168.3.180      UH          1        0   1500   tun0
(public-ip)        link#1             UC          0        0      -   xl0
224/4              127.0.0.1          URS         0        0  33224   lo0


Encap:
Source             Port  Destination        Port  Proto 
SA(Address/Proto/Type/Direction)
192.168.2/24       0     192.168.1/24       0     0 217.215.7.177/50/use/in
192.168.1/24       0     192.168.2/24       0     0 
217.215.7.177/50/require/ou