[CentOS] PPTP - VPN 연결 오류 시

[root@localhost ~]# modprobe ip_nat_pptp
[root@localhost ~]# modprobe ip_conntrack_pptp

 

위에 모듈이 활성화 되어있지 않으면 클라이언트에서는 619 오류가 발생되고 서버쪽에는 아래와 같은 메세지가 나타난다.

Apr 23 08:57:30 localhost pptpd[10934]: CTRL: Starting call (launching pppd, opening GRE)
Apr 23 08:57:30 localhost pppd[10935]: Plugin /usr/lib/pptpd/pptpd-logwtmp.so loaded.
Apr 23 08:57:30 localhost pppd[10935]: pptpd-logwtmp: $Version$
Apr 23 08:57:30 localhost pppd[10935]: pppd 2.4.4 started by root, uid 0
Apr 23 08:57:30 localhost pppd[10935]: Using interface ppp0
Apr 23 08:57:30 localhost pppd[10935]: Connect: ppp0 <--> /dev/pts/1
Apr 23 08:57:30 localhost pptpd[10934]: GRE: Bad checksum from pppd.
Apr 23 08:57:30 localhost pptpd[10934]: GRE: read(fd=7,buffer=80515e0,len=8260) from network failed: status = -1 error = Protocol not available
Apr 23 08:57:30 localhost pptpd[10934]: CTRL: GRE read or PTY write failed (gre,pty)=(7,6)
Apr 23 08:57:30 localhost pppd[10935]: Modem hangup
Apr 23 08:57:30 localhost pppd[10935]: Connection terminated.
Apr 23 08:57:30 localhost pppd[10935]: Exit.
Apr 23 08:57:30 localhost pptpd[10934]: CTRL: Client 218.xxx.xxx.xxx control connection finished

 

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