[pptp-server] Martian packets and NetBIOS problems

[Leo Torio]

I've been trying to setup pptpd without success.

So far, I am able to connect to the VPN server. However, I cannot ping
anything on the LAN or the server. The server, however, seems to be able to
ping the client.

I disabled my firewall (just in case), but I get the same results.

I view my logs and I find that after the VPN connection is established,
martian packets are logged.

Here is a sample of my logs:

Oct 23 11:33:50 neptune pptpd[16040]: CTRL: Client 149.99.222.31 control
connection started
Oct 23 11:33:51 neptune pptpd[16040]: CTRL: Starting call (launching pppd,
opening GRE)
Oct 23 11:33:51 neptune pppd[16041]: pppd 2.4.0 started by root, uid 0
Oct 23 11:33:51 neptune pppd[16041]: Using interface ppp1
Oct 23 11:33:51 neptune pppd[16041]: Connect: ppp1 <--> /dev/pts/3
Oct 23 11:33:51 neptune pptpd[16040]: GRE: Bad checksum from pppd.
Oct 23 11:33:51 neptune pptpd[16040]: GRE: Discarding duplicate packet
Oct 23 11:33:53 neptune pptpd[16040]: CTRL: Ignored a SET LINK INFO packet
with real ACCMs!
Oct 23 11:33:53 neptune kernel: PPP BSD Compression module registered
Oct 23 11:33:53 neptune kernel: PPP MPPE compression module registered
Oct 23 11:33:54 neptune kernel: PPP Deflate Compression module registered
Oct 23 11:33:54 neptune pppd[16041]: MSCHAP-v2 peer authentication succeeded
for leo
Oct 23 11:33:54 neptune pppd[16041]: found interface eth1 for proxy arp
Oct 23 11:33:54 neptune pppd[16041]: local  IP address 192.168.1.51
Oct 23 11:33:54 neptune pppd[16041]: remote IP address 192.168.1.51
Oct 23 11:33:54 neptune pppd[16041]: MPPE 128 bit, stateless compression
enabled
Oct 23 11:33:54 neptune kernel: NET: 1 messages suppressed.
Oct 23 11:33:54 neptune kernel: martian source 255.255.255.255 from
192.168.1.51, on dev ppp1
Oct 23 11:33:54 neptune kernel: ll header: 45:00:00:60:89:b2:00:00
Oct 23 11:33:55 neptune kernel: martian source 255.255.255.255 from
192.168.1.51, on dev ppp1
Oct 23 11:33:55 neptune kernel: ll header: 45:00:00:60:89:b4:00:00
Oct 23 11:34:23 neptune pppd[16041]: LCP terminated by peer
(2M-qCM-X^@<M-Mt^@^@^@^@)
Oct 23 11:34:23 neptune pppd[16041]: Modem hangup
Oct 23 11:34:23 neptune pppd[16041]: Connection terminated.
Oct 23 11:34:23 neptune pppd[16041]: Connect time 0.6 minutes.
Oct 23 11:34:23 neptune pppd[16041]: Sent 135 bytes, received 2892 bytes.
Oct 23 11:34:23 neptune pptpd[16040]: CTRL: Error with select(), quitting
Oct 23 11:34:23 neptune pptpd[16040]: CTRL: Client 149.99.222.31 control
connection finished
Oct 23 11:34:23 neptune pppd[16041]: Exit.

I've searched the mailing list and usenet, but I haven't found any
information on how to solve this problem. Can someone help?

Thanks.

Leo