[H-GEN] ISDN Dialin

[Tony Nugent]

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On Tue Mar 11 2003 at 03:55, "The Revolution" wrote:

> I have setup an ISDN dialin and have got the basics working
> The client can dialin, login and be assigned an IP
> However the client can only see the RAS host and not the
> LAN
> Trying to learn iptables, routing, etc but im getting
> nowhere
> A little advice would be handy... 8P

Without knowing exactly what you have there, here are some hints to
work on:

1. Have you turned on routing in the kernel on the dialin server?

   echo 1 > /proc/sys/net/ipv4/ip_forward

2. Check the sanity of the output of this command, does it have
   routes to your lan and to the connecting host?

   /sbin/ip route

   (NB: /sbin/route /sbin/ifconfig and /sbin/arp are all obseleted
   by the /sbin/ip utility in kernels 2.2.x and later).

3. Do the boxes on the LAN have a (default?) route that will allow
   them to reply to the client?

4. If the client is being given an IP address that will effectively
   add it to the same subnet as the LAN (which is common), then have
   you enabled proxyarp so that the server will listen for traffic
   for the dialup client (and then forward to it)?

5. Are there iptables rules in the FORWARD chain blocking the flow
   of traffic between the LAN and the dialup box?

6. Is DNS working?  (I assume that the client is being given a local
   DNS server to use by the server, or that the client has an
   appropriate DNS server setting in its own config).

7. Does the client have a (default?) route via the RAS server that
   will allow it to talk to the LAN?

... etc etc.

> Dan Roe

Hope this helps.  Have fun!

Cheers
Tony

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