[pptp-server] Cannot reach remote network. Kernel problem?

[Henning Holtschneider]

Hi,

I've got a problem connecting to a remote network via a PoPToP 1.0.0
server. The server is running Linux 2.0.36. The PPTP (VPN) connection from
my Windows 98 client works well and I can ping the internal IP address of
the PPTP gateway server. However, I cannot reach anything beyond that
server. I get the following syslog messages:

Aug  9 15:23:45 gatekeeper pptpd[5144]: CTRL: Client x.x.x.x control connection started
Aug  9 15:23:47 gatekeeper pptpd[5144]: CTRL: Starting call (launching pppd, opening GRE)
Aug  9 15:23:47 gatekeeper pptpd[5144]: CTRL: Allocating pty/tty pair
Aug  9 15:23:47 gatekeeper pptpd[5144]: CTRL: Allocated pty/tty pair (/dev/ptyp0,/dev/ttyp0)
Aug  9 15:23:47 gatekeeper modprobe: can't locate module char-major-108
Aug  9 15:23:47 gatekeeper pppd[5145]: pppd 2.3.10 started by , uid 0
Aug  9 15:23:47 gatekeeper pptpd[5144]: GRE: Discarding duplicate packet
Aug  9 15:23:47 gatekeeper pppd[5145]: Using interface ppp0
Aug  9 15:23:47 gatekeeper pppd[5145]: Connect: ppp0 <--> /dev/ttyp0
Aug  9 15:23:49 gatekeeper pptpd[5144]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Aug  9 15:23:49 gatekeeper pppd[5145]: CHAP peer authentication succeeded for xxx
Aug  9 15:23:49 gatekeeper pppd[5145]: found interface eth1 for proxy arp
Aug  9 15:23:49 gatekeeper pppd[5145]: local  IP address 192.1.1.8
Aug  9 15:23:49 gatekeeper pppd[5145]: remote IP address 192.1.1.203
[...]
Aug  9 15:27:52 gatekeeper pptpd[5144]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Aug  9 15:27:52 gatekeeper pppd[5145]: LCP terminated by peer (O^H1M-8^@<M-Mt^@^@^@^@)
Aug  9 15:27:52 gatekeeper pptpd[5144]: CTRL: Error with select(), quitting
Aug  9 15:27:52 gatekeeper pptpd[5144]: CTRL: Client x.x.x.x control connection finished
Aug  9 15:27:52 gatekeeper pppd[5145]: Modem hangup
Aug  9 15:27:52 gatekeeper pppd[5145]: Connection terminated.
Aug  9 15:27:52 gatekeeper pppd[5145]: Connect time 4.1 minutes.
Aug  9 15:27:52 gatekeeper pppd[5145]: Sent 629 bytes, received 5183 bytes.
Aug  9 15:27:52 gatekeeper pppd[5145]: Exit.

I used tcpdump to watch what is going on on eth1 (local ethernet). If I
try to ping a host on the internal network from the PPTP client or vice
versa, I see the arp replies from the PPTP server, but no ICMP packets.

I'm using a similar configuration on another box running Linux 2.2.14. I
have no such problems there. The PoPToP documentation states that "2.0.x
should be ok". Is anyone using a 2.0.x kernel successfully?

Regards,

	<-gninneH<-
--
    __                 _  __    __   Henning Holtschneider   henning at loca.net
   / /  ___  _______ _/ |/ /__ / /_  System Administration
  / /__/ _ \/ __/ _ `/    / -_) __/
 /____/\___/\__/\_,_/_/|_/\__/\__/  ...net happens!