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  1. #1

    Poptop GRE read error


    Hi

    I'm having trouble setting up a VPN to connect my pc to. Now I'm able to connect to the VPN and the internet throught it, but the connection fails after a few minutes.

    pptpd v1.3.4
    Linux 2.6.18
    Debian 5.0

    Code:
    Oct 24 20:50:10 64456 pptpd[8443]: CTRL: Client client_ip control connection started
    Oct 24 20:50:10 64456 pptpd[8443]: CTRL: Starting call (launching pppd, opening GRE)
    Oct 24 20:50:10 64456 pptpd[8443]: GRE: Bad checksum from pppd.
    Oct 24 20:50:11 64456 pptpd[8443]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
    Oct 24 20:52:32 64456 pptpd[8443]: GRE: read(fd=7,buffer=80505a0,len=8260) from network failed: status = -1 error = Protocol not available
    Oct 24 20:52:32 64456 pptpd[8443]: CTRL: GRE read or PTY write failed (gre,pty)=(7,6)
    Oct 24 20:52:32 64456 pptpd[8443]: CTRL: Reaping child PPP[8444]
    Oct 24 20:52:32 64456 pptpd[8443]: CTRL: Client client_ip control connection finished
    
    Oct 24 20:48:50 64456 kernel: GRE over IPv4 tunneling driver
    Oct 24 20:50:10 64456 pppd[8444]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
    Oct 24 20:50:10 64456 pppd[8444]: pptpd-logwtmp: $Version$
    Oct 24 20:50:10 64456 pppd[8444]: pppd 2.4.4 started by root, uid 0
    Oct 24 20:50:10 64456 pppd[8444]: Using interface ppp0
    Oct 24 20:50:10 64456 pppd[8444]: Connect: ppp0 <--> /dev/pts/1
    Oct 24 20:50:11 64456 pppd[8444]: MPPE 128-bit stateless compression enabled
    Oct 24 20:50:13 64456 pppd[8444]: local  IP address 192.168.0.1
    Oct 24 20:50:13 64456 pppd[8444]: remote IP address 192.168.1.1
    Oct 24 20:50:13 64456 pppd[8444]: pptpd-logwtmp.so ip-up ppp0 client_username client_ip
    Oct 24 20:52:32 64456 pppd[8444]: Modem hangup
    Oct 24 20:52:32 64456 pppd[8444]: pptpd-logwtmp.so ip-down ppp0
    Oct 24 20:52:32 64456 pppd[8444]: Connect time 2.4 minutes.
    Oct 24 20:52:32 64456 pppd[8444]: Sent 227248 bytes, received 124995 bytes.
    Oct 24 20:52:32 64456 pppd[8444]: Connection terminated.
    Oct 24 20:52:32 64456 pppd[8444]: Exit.
    Oct 24 21:11:44 64456 -- MARK --
    There is an explanation of this error at poptop.sourceforge[net]/dox/qna.html#27

    As it suggested, I installed tcpdump and ran the following: (binary)
    Code:
    tcpdump -w test.pcap \(dst client_ip or src client_ip\) and \(icmp port 22 or icmp port 1723\)
    I also ran "modprobe ip_nat_pptp" just in case it wasn't loaded.

    Not sure what I should do?
    Thanks-

  2. #2
    Overdue update:
    Turn on Windows firewall (Vista)

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