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pptpd
pptpd
windowsから接続し、しばらくすると勝手に切断されてしまう。
/var/log/messageを確認してみると
Apr 28 16:09:28 usergw pptpd[5278]: CTRL: Client 210.238.206.66 control connection started
Apr 28 16:09:28 usergw pptpd[5278]: CTRL: Starting call (launching pppd, opening GRE)
Apr 28 16:09:28 usergw pppd[5279]: pppd 2.4.1 started by root, uid 0
Apr 28 16:09:28 usergw pppd[5279]: Using interface ppp0
Apr 28 16:09:28 usergw pppd[5279]: Connect: ppp0 <--> /dev/pts/0
Apr 28 16:09:28 usergw /etc/hotplug/net.agent: assuming ppp0 is already up
Apr 28 16:09:31 usergw pptpd[5278]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Apr 28 16:09:31 usergw pppd[5279]: CHAP peer authentication succeeded for fukaya
Apr 28 16:09:31 usergw pppd[5279]: found interface eth1 for proxy arp
Apr 28 16:09:31 usergw pppd[5279]: local IP address 192.168.10.102
Apr 28 16:09:31 usergw pppd[5279]: remote IP address 192.168.10.61
Apr 28 16:09:53 usergw pptpd[5278]: GRE: read(fd=5,buffer=80555c0,len=8260) from network failed: status = -1 error = Message too long
Apr 28 16:09:53 usergw pptpd[5278]: CTRL: GRE read or PTY write failed (gre,pty)=(5,4)
Apr 28 16:09:53 usergw pppd[5279]: Modem hangup
Apr 28 16:09:53 usergw pppd[5279]: Connection terminated.
Apr 28 16:09:53 usergw pppd[5279]: Connect time 0.5 minutes.
Apr 28 16:09:53 usergw pppd[5279]: Sent 3281 bytes, received 3332 bytes.
Apr 28 16:09:53 usergw /etc/hotplug/net.agent: NET unregister event not supported
Apr 28 16:09:53 usergw pppd[5279]: Exit.
Apr 28 16:09:53 usergw pptpd[5278]: CTRL: Client 210.238.206.66 control connection finished
切断された直後のメッセージを見てみると「error = Message too long」の行がありました。
結論
options.pptpdファイルに「mtu = 1400」の様にmtuを強制的に小さくしてしまう。
本来、自動で調整されるはずですが、なんらかの原因でたまにおかしくなることがあるようです。