Linux+PPP+3G:DebugInfo

拨号日志如下:

/etc/ppp/cdma-ppp-on ttyUSB0
Z
Serial connection established.
using channel 12
Using interface ppp0
Connect: ppp0 <--> /dev/ttyUSB0
rcvd [LCP ConfReq id=0x1 ccomp>]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [LCP ConfReq id=0x1 ]
sent [LCP ConfAck id=0x1 ccomp>]
rcvd [LCP ConfAck id=0x1 ]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [PAP AuthReq id=0x1 user="card" password=]
rcvd [PAP AuthAck id=0x1 ""]
sent [IPCP ConfReq id=0x1 <
ms-dns3 0.0.0.0>]
rcvd [IPCP ConfReq id=0x1 ]
sent [IPCP ConfAck id=0x1 ]
rcvd [IPCP ConfNak id=0x1 ns3 219.150.32.132>]
sent [IPCP ConfReq id=0x2 2.222.222.222> ]
rcvd [IPCP ConfAck id=0x2 2.222.222.222> ]
local  IP address 111.225.177.193
remote IP address 115.168.66.10
primary   DNS address 222.222.222.222
secondary DNS address 219.150.32.132
Script /etc/ppp/ip-up started (pid 5471)
Script /etc/ppp/ip-up finished (pid 5471), status = 0x0
rcvd [LCP ConfReq id=0x2 ccomp>]
Script /etc/ppp/ip-down started (pid 5642)
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [LCP ConfReq id=0x2 ]
sent [LCP ConfAck id=0x2 ccomp>]
Script /etc/ppp/ip-down finished (pid 5642), status = 0x0
rcvd [LCP ConfAck id=0x2 ]
Warning - secret file /etc/ppp/pap-secrets has world and/or group access
sent [PAP AuthReq id=0x2 user="card" password=]
rcvd [PAP AuthAck id=0x2 ""]
sent [IPCP ConfReq id=0x3 0.0.0> ]
rcvd [IPCP ConfReq id=0x1 ]
sent [IPCP ConfAck id=0x1 ]
rcvd [IPCP ConfNak id=0x3 ]
sent [IPCP ConfReq id=0x4 2.222.222.222> ]
rcvd [IPCP ConfAck id=0x4 2.222.222.222> ]
local  IP address 111.225.177.193
remote IP address 115.168.66.10
primary   DNS address 222.222.222.222
secondary DNS address 219.150.32.132
Script /etc/ppp/ip-up started (pid 5646)
Script /etc/ppp/ip-up finished (pid 5646), status = 0x0
09:02:03   thread1   16386,   val   =   1,   signal   captured.
net check........
ppp0==111.225.177.193
rcvd [LCP TermReq id=0x3]
LCP terminated by peer
Script /etc/ppp/ip-down started (pid 5817)
sent [LCP TermAck id=0x3]
Script /etc/ppp/ip-down finished (pid 5817), status = 0x0
Connection terminated.
Connect time 2.6 minutes.
Sent 90525 bytes, received 4251554 bytes.

 

上线没多久就掉了,如何解决?

大致看了下PPP协议规范,一步步分析,求解中...

>local  IP address 111.225.177.193
>remote IP address 115.168.66.10
>primary   DNS address 222.222.222.222
>secondary DNS address 219.150.32.132
>Script /etc/ppp/ip-up started (pid 5471)
>Script /etc/ppp/ip-up finished (pid 5471), status = 0x0
>rcvd [LCP ConfReq id=0x2 ccomp>]

上线成功后,突然受到LCP ConfReq 对端链路配置请求,在PPP协议规范中有:在LCP建立完成以后，如果收到LCP配置请求包(LCP Configure—Request)，链路将从网络层协议阶段或者认证阶段返回到链路建立阶段。所以回到链路建立阶段.

但是是什么情况会出现peers的重新配置请求呢?

PPP可以在任意时间终止链路。引起链路终止的原因很多：载波丢失、认证失败、链路质量失败、空闲周期定时器期满、或者管理员关闭链路。LCP用交换Terminate（终止）packets的方法终止链路。当链路正被关闭时，PPP通知网络层协议，以便他们可以采取正确的行动。交换Terminate（终止）packets之后，执行应该通知物理层断开，以便强制链路终止，尤其当认证失败时。

这么多原因啊,一个个排除吧