通过开发同事老是提出连接上***确ping不通内网，经过日志排查

Dec 17 10:27:33 webserver pppd[11221]: LCP terminated by peer (U^_^^M-I^@ /dev/pts/2
Dec 17 10:27:44 webserver pptpd[11240]: GRE: Bad checksum from pppd.
Dec 17 10:27:47 webserver pptpd[11240]: CTRL: Ignored a SET LINK INFO packet with real ACCMs!
Dec 17 10:27:47 webserver pppd[11241]: MPPE 128-bit stateless compression enabled
Dec 17 10:27:48 webserver pppd[11241]: found interface eth0 for proxy arp
Dec 17 10:27:48 webserver pppd[11241]: local  IP address 192.168.1.17
Dec 17 10:27:48 webserver pppd[11241]: remote IP address 192.168.1.211


Dec 17 10:27:44 webserver pptpd[11240]: GRE: Bad checksum from pppd.
发现存在报错

1.首先查看***软件版本


[root@webserver ~]# rpm -qa ppp

ppp-2.4.5-5.el6.x86_64

[root@webserver ~]# rpm -qa pptp

pptp-1.7.2-8.1.el6.x86_64

[root@webserver ~]# rpm -qa pptpd

pptpd-1.3.4-2.el6.x86_64

[root@webserver ~]# sysctl -p

net.ipv4.ip_forward = 1

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

error: "net.bridge.bridge-nf-call-ip6tables" is an unknown key

error: "net.bridge.bridge-nf-call-iptables" is an unknown key

error: "net.bridge.bridge-nf-call-arptables" is an unknown key

kernel.msgmnb = 65536

kernel.msgmax = 65536

kernel.shmmax = 68719476736

kernel.shmall = 4294967296

You have mail in /var/spool/mail/root


版本没错但是发现转发有错


加载模块然后重启解决

[root@webserver ~]# modprobe bridge

[root@webserver ~]# lsmod | grep bridge

bridge                 79078  0 

stp                     2218  1 bridge

llc                     5546  2 bridge,stp

[root@webserver ~]# service pptpd restart

Shutting down pptpd:                                       [  OK  ]

Starting pptpd:                                            [  OK  ]

Warning: a pptpd restart does not terminate existing 

connections, so new connections may be assigned the same IP 

address and cause unexpected results.  Use restart-kill to 

destroy existing connections during a restart.