Subject: does IPNAT work or not?
To: None <netbsd-help@netbsd.org>
From: Olli <oliverko@dialup.nacamar.de>
List: netbsd-help
Date: 02/12/1999 19:20:09
Hi all,

I setup my NetBSD-1.3.2-box as a dialup-router. I did the following:

1. recompiled the kernel with option GATEWAY, pseudo-device ipfilter
2. installed ppp (in rc.conf -> call /etc/ppp/peers/isp) with demand
option
3. setup IPNAT + IPF (no entries in /etc/ipf.conf -> no firewalling)

OK - it should work. I called telnet 141.30.4.242 (is
physik.phy.tu-dresden.de) from my Linux (debian1.network.de, IP
192.168.1.2) - the NetBSD-box (netbsd1.network.de, IP 192.168.1.1)
established a connection to my ISP via modem. But I didn't get any
response from the remote host. So I lauched up tcpdump on the
dialup-router. I'm not sure how to interpret the output:

<time><some numbers> debian1.network.de.10227 >
physik.phy.tu-dresden.de.telnet: S328

<time><some numbers>  win 512 <mss 1460> [tos 0x10]

<time><some numbers> arp who-has debian1.network.de tell
netbsd1.network.de

<time><some numbers>  arp debian1.network.de is-at 52:54:0:de:6d:51

<time><some numbers> physik.phy.tu-dresden.de.telnet >
debian1.network.de.1027: S 339

...

<time><some numbers>  52:54:0:de:30:e > 3:0:0:0:0:1 sap f0 ui/C ln0145

< block with some numbers>

<time><some numbers> 192.168.1.3 netbios-dgm >
192.168.1.255.netbios-dgm: udp 201


- and so on.

I'm not sure why 192.168.1.3/255 are called - this IP's are not given
to any computer in my network?

Has anyone an idea why I didn't get back a response to my telnet
program on my Linux-box?

thanks a lot.
with regards,
oliver