[pptp-server] Unsupported protocol 0xd057 received

[Jeff Zacharias]

I'm using redhat 7 with kernel 2.2.16-22, with pptpd-1.0.0-1.i386.rpm and
ppp-2.3.11 with patch ppp-2.3.11-openssl-0.9.5-mppe.patch.gz.  With this
config it did not compile the ppp module in the kernel.  So it was suggested
to me that I change the following line in the
/usr/src/linux/drivers/net/ppp.c

kill_fasync (ppp->tty->fasync, SIGIO);

to

kill_fasync (ppp->tty->fasync, SIGIO, POLL_IN);

With this change it finally compiled.  Now when I do all the rmmod and insmod,
and start pptpd, I can connect with win98 client, but I cannot ping the server
signed pptpd IP address (192.168.21.2).  And I get the following error in the
/var/log/messages.


Oct 12 22:33:19 zebra pptpd[4241]: CTRL: Client 192.168.20.5 control
connection started
Oct 12 22:33:19 zebra pptpd[4241]: CTRL: Starting call (launching pppd,
opening GRE)
Oct 12 22:33:19 zebra pppd[4242]: pppd 2.3.11 started by root, uid 0
Oct 12 22:33:19 zebra pppd[4242]: Using interface ppp1
Oct 12 22:33:19 zebra pppd[4242]: Connect: ppp1 <--> /dev/pts/3
Oct 12 22:33:19 zebra pppd[4242]: MSCHAP peer authentication succeeded for f
Oct 12 22:33:19 zebra pppd[4242]: found interface eth1 for proxy arp
Oct 12 22:33:19 zebra pppd[4242]: local  IP address 192.168.21.2
Oct 12 22:33:19 zebra pppd[4242]: remote IP address 192.168.21.52
Oct 12 22:33:19 zebra pppd[4242]: MPPE 40 bit, stateless compression enabled
Oct 12 22:33:20 zebra pppd[4242]: Unsupported protocol 0xd057 received
Oct 12 22:33:22 zebra pppd[4242]: Unsupported protocol 0x8bd2 received
Oct 12 22:33:22 zebra pppd[4242]: Unsupported protocol 0xe658 received
Oct 12 22:33:22 zebra pppd[4242]: Unsupported protocol 0x587c received
Oct 12 22:33:23 zebra pppd[4242]: Unsupported protocol 0xcf26 received
...etc

I should also note that if I turn off the encryption part, everything works
fine and I can ping what I want and access what I want over the pptp
connection.  Is there any fix for this?

Sincerely
Jeff Zacharias
zffej at netscape.net

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