Installation

I'm having problems with msn and other services using m0n0wall, web navigation works normally. I used the pptp option in wan interface and then I added a static route to the isp's gateways.

PPTP:

Local IP: 172.16.8.33/24
Remote IP: 172.16.1.4

Static route:

172.16.1.0/24
172.16.8.1

The problem disappears when I connect my macbook directly to internet (using the pptp client).

I suspect it's a NAT problem, but I'm not sure.

Thanks in advance, and sorry for my poor english.

I would suspect that's a MTU issue, but I'm not sure how you would fix that with a PPTP WAN type.

Try this - lower the MTU on a client machine to 1400 and see if the problem goes away for that machine. If so, it's confirmed to be a MTU issue.

Yes, it was an mtu problem. Thanks.
Now the problem is configuring the router's MTU so it works without changing each machine.

Is there some easy way to set the mtu for pptp?
Reading some docs, I found that putting:
set link mru 1400
in mpd.conf should do the trick.
But monowall generates that file using interfaces.inc (is that right?) and any change done with exec.php is not permanent (at least it seems so).
So, anyone knows how to introduce that configuration in monowall?

Thanks!

Yes, it was an mtu problem. Thanks.
Now the problem is configuring the router's MTU so it works without changing each machine.

I think you will find that this probably will not work. It's the TCP/IP stack on the machine initiating the connection (machine behind the router) that sends the MTU message out to the other end, and it's the other end that is sending packets that are too large.