azeredo@qmc.ufsc.br spake the following on 7/28/2006 4:50 PM:
Hi,Thanks a lot to the guy that tried to help me. But i really need to use centos 4.3 since i have 3 linux already running and i didn't want to reinstall and reconfigure them. The problem is that i need full support to pptp-conntract and also ppp_mppe in the kernel. I had to compile a kernel with that modules by myself. I even tried to use those modules already compiled for the 2.6 kernel for SME server (that are similar to those of centos 4)
that one can find at
http://distro.ibiblio.org/pub/linux/distributions/smeserver/releases/7/build...
But the problem is that the modules install and are loaded but cannot work together. No VPN coming into the intranet gets connected when module ip_nat_pptp is loaded . Look at the error:
Jul 28 20:25:48 edm194 pppd[20710]: pptpd-logwtmp: $Version$ Jul 28 20:25:48 edm194 pppd[20710]: pppd 2.4.3 started by root, uid 0 Jul 28 20:25:48 edm194 pppd[20710]: Using interface ppp0 Jul 28 20:25:48 edm194 pppd[20710]: Connect: ppp0 <--> /dev/pts/1 Jul 28 20:25:48 edm194 pptpd[20709]: GRE: Bad checksum from pppd. Jul 28 20:26:18 edm194 pppd[20710]: LCP: timeout sending Config-Requests Jul 28 20:26:18 edm194 pppd[20710]: Connection terminated. Jul 28 20:26:18 edm194 pppd[20710]: Using interface ppp0 Jul 28 20:26:18 edm194 pppd[20710]: Connect: ppp0 <--> /dev/pts/1 Jul 28 20:26:18 edm194 pppd[20710]: tcflush failed: Bad file descriptor Jul 28 20:26:18 edm194 pppd[20710]: tcsetattr: Invalid argument (line 1016) Jul 28 20:26:18 edm194 pppd[20710]: Exit. Jul 28 20:26:18 edm194 pptpd[20709]: GRE: read(fd=6,buffer=804eb00,len=8196) from PTY failed: status = -1 error = Input/output error, usually caused by unexpected termination of pppd, check option syntax and pppd logs Jul 28 20:26:18 edm194 pptpd[20709]: CTRL: PTY read or GRE write failed (pty,gre)=(6,7) Jul 28 20:26:18 edm194 pptpd[20709]: CTRL: Client 201.14.175.204 control connection finished As soon as I unload this module the connection establishes. But I managed to get a 2.4.31 kernel running with all these modules, namely
ip_conntrack_pptp ip_conntrack_proto_gre ip_nat_pptp ip_nat_proto_gre
and
ppp_mppe
loaded so that incoming VPN connections work, as well as outgoing vpn connections through NAT at the gateway are correctly redirected to the server outside the intranet. This kernel is in another linux that runs and old version of red hat. I need to upgrade this system and centos is my choice. So, that is the reason i want a kernel 2.4 loaded in centos 4.3 or 4.2. Actually i've read somewhere that, with compatible modutils, i can do that, but i don't know how to install and where to find modutils ( old ones) that will let me boot my 2.4.31 kernel in centos 4, without disrupting the whole system.
I hope someone can help me out. If anyone knows where i can findthose modules for centos kernel 2.6 would also solve the problem. Any other solution to my problem is very welcome too.
Clarkconnect Linux is based on CentOS 4 and has working pptp patches. Maybe you could try there, or just use their distro. I use it for several firewalls, and it works great!