I can connect to my VPN network just fine. However I cannot ping any box other than the pptpd server. I think that this may have something to do with the GRE error that I am getting? Here are my config files and the error messages. Thanks.

/etc/pptpd.conf

debug
logwtmp
localip 192.168.1.200
remoteip 192.168.1.201-202
# or
#localip 192.168.0.234-238,192.168.0.245
#remoteip 192.168.1.234-238,192.168.1.245


/etc/ppp/options.pptpd


name pptpd


refuse-pap
refuse-chap
refuse-mschap


require-mschap-v2

require-mppe-128

ms-dns 192.168.1.99
#ms-dns 10.0.0.2

proxyarp

debug
nobsdcomp


messages -->

Dec 30 16:10:52 wyatt pptpd: pptpd shutdown succeeded
Dec 30 16:10:52 wyatt pptpd[3551]: MGR: Manager process started
Dec 30 16:10:52 wyatt pptpd[3551]: MGR: Maximum of 2 connections available
Dec 30 16:10:52 wyatt pptpd: pptpd startup succeeded
Dec 30 16:10:58 wyatt pppd[3499]: LCP terminated by peer (^@4$M-r^@<M-Mt^@^@^@^@)
Dec 30 16:10:58 wyatt pppd[3499]: pptpd-logwtmp.so ip-down ppp0
Dec 30 16:10:58 wyatt pppd[3499]: Modem hangup
Dec 30 16:10:58 wyatt pppd[3499]: Connection terminated.
Dec 30 16:10:58 wyatt pppd[3499]: Connect time 3.1 minutes.
Dec 30 16:10:58 wyatt pppd[3499]: Sent 160 bytes, received 4749 bytes.
Dec 30 16:10:58 wyatt pppd[3499]: Exit.
Dec 30 16:10:58 wyatt pptpd[3498]: CTRL: Client 0.0.0.0 control connection finished
Dec 30 16:11:02 wyatt pptpd[3586]: CTRL: Client 0.0.0.0 control connection started
Dec 30 16:11:02 wyatt pptpd[3586]: CTRL: Starting call (launching pppd, opening GRE)
Dec 30 16:11:02 wyatt pppd[3587]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Dec 30 16:11:02 wyatt pppd[3587]: pptpd-logwtmp: $Version$
Dec 30 16:11:02 wyatt pppd[3587]: pppd 2.4.3 started by root, uid 0
Dec 30 16:11:02 wyatt pppd[3587]: Using interface ppp0
Dec 30 16:11:02 wyatt pppd[3587]: Connect: ppp0 <--> /dev/pts/2
Dec 30 16:11:02 wyatt pptpd[3586]: GRE: Bad checksum from pppd.
Dec 30 16:11:03 wyatt pptpd[3586]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Dec 30 16:11:03 wyatt pppd[3587]: MPPE 128-bit stateless compression enabled
Dec 30 16:11:05 wyatt pppd[3587]: local IP address 192.168.1.200
Dec 30 16:11:05 wyatt pppd[3587]: remote IP address 192.168.1.201
Dec 30 16:11:05 wyatt pppd[3587]: pptpd-logwtmp.so ip-up ppp0