Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

got a very strange behaviour with a Gentoo-based PPTP-Gateway here. I configured the VPN and the default routes - from the Gateway itself, the connections out to the VPN work great. But from the Clients, connected to the Router, I just can do pings into this VPN. No HTTP-Traffic, no FTP etc.

iptables is not used and flushed, so I don't think, that's the point of failure.

Does anyone have some hints to look for?

(Edited the title for a better understanding)

share|improve this question
    
Check the MTU settings. –  topdog Aug 17 '10 at 7:36
    
Yeah, thought of it too - but mtu's of 1492, 1450, 1400 and 1000 are all giving the same results. –  braindump Aug 17 '10 at 7:39
    
Use tcpdump to see what is happening to the traffic flow. –  topdog Aug 17 '10 at 7:52

1 Answer 1

Okay, it's been the MTU. a

iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu

did it. Thanks to everyone.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.