VPN revisited.

wlanmac wlan at mac.com
Thu Aug 21 11:37:03 UTC 2008

What do your iptables rules look like when running chilli? 

On Thu, 2008-08-21 at 12:57 +0200, Peter Warasin wrote:
> Hi Sevan, hi IanC
> Sevan / Venture37 wrote:
> >> Yes, its those very kernel modules and iptables rules Im currently
> >> wrestling with, to no avail.
> I have exactly the same problem. I narrowed down the problem to chilli, 
> at least I think so.
> (it's a linux kernel 2.6.22, with pptp netfilter helpers loaded and gre 
> and port 1723 allowed)
> PPTP is working well passing through the exactly same box when chilli is 
> not running. It takes about 2 seconds to connect. connect, disconnect, 
> reconnecting, that's all working fine, also with multiple clients and 
> different servers.
> As soon as i snap in chilli, establishing a PPTP connection takes a very 
> very long time (several minutes).
> Most of the time there is no chance to connect. Only sometimes, after a 
> long handshake period PPTP connects. I think that's pure luck that it 
> connects.
> I noticed that chilli somehow seems to send out of order duplicates 
> through the tun device. At least I see (with wireshark) TCP DUP ACK's 
> coming back from the server some packets after the original ACK, which 
> causes the client to resend a SYN, which then confuses the protocol.
> I see then closing the connection (PSH ACK, FIN ACK, ACK, RST) and 
> reconnecting (SYN, SYN ACK, ...).
> I am digging deeper into the source code right now in order to debug the 
> problem. If someone has advices, please tell me :)
> kind regards,
> peter

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