孙兆强,F1003-L-C4G拨号成功后ping不通外网

1686031940,

问题描述

4G拨号能成功但是ping不通外网，debug看有发出。会话看没有回包。但是把卡换到手机或者4G路由器上就都正常。同型号设备测试同样故障。

过程分析

查看拨号口状态正常

[H3C]display cellular

Cellular1/0/0:

  Hardware Information:

    Model: L716-CN

    Modem Firmware Version: 17016

    Hardware Version:

    International Mobile Subscriber Identity (IMSI): 460062091231046

    International Mobile Equipment Identity (IMEI): 869312061153457

    Modem Status: Online

  Profile Information:

    Profile 1: Active

      PDP Type: IPv4

      Header Compression: OFF

      Data Compression: OFF

      Access Point Name (APN): shqnxx04

  Modem Setup Information:

    Diagnostics Monitor: Close

  Network Information:

    Current Service Status: Service available

    Current Roaming Status: Home

    Current Data Bearer Technology: Unknown

    Network Selection Mode: Automatic

    Network Connection Mode: Unknown

    Current Network Connection: LTE

    Mobile Network Name: Unknown

    Downstream Bandwidth: Unknown

  Radio Information:

    Current RSSI: -55 dBm

  Modem Security Information:

    PIN Verification: Disabled

    PIN Status: Unknown

SIM Status: OK

Debug ip icmp信息看公网没有回包

<H3C>ping 114.114.114.114

Ping 114.114.114.114 (114.114.114.114): 56 data bytes, press CTRL+C to break

*Apr 28 16:20:47:811 2023 PS4673 SOCKET/7/ICMP:

ICMP Output:

 ICMP Packet: src = 10.45.39.121, dst = 114.114.114.114

              type = 8, code = 0 (echo)

 

Request time out

*Apr 28 16:20:50:062 2023 PS4673 SOCKET/7/ICMP:

ICMP Output:

 ICMP Packet: src = 10.45.39.121, dst = 114.114.114.114

              type = 8, code = 0 (echo)

查看会话看公网也没有回包

Dis session table ipv4 protocol icmp verbose

Slot 1:

Initiator:

  Source      IP/port: 10.45.39.121/1288

  Destination IP/port: 114.114.114.114/2048

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: ICMP(1)

  Inbound interface: InLoopBack0

  Source security zone: Local

Responder:

  Source      IP/port: 114.114.114.114/1288

  Destination IP/port: 10.45.39.121/0

  DS-Lite tunnel peer: -

  VPN instance/VLAN ID/Inline ID: -/-/-

  Protocol: ICMP(1)

  Inbound interface: Eth-channel1/0/0:0

  Source security zone: Untrust

State: ICMP_REQUEST

Application: ICMP

Rule ID: 0

Rule name: Local->other

Start time: 2023-04-28 16:21:35  TTL: 55s

Initiator->Responder:            5 packets        420 bytes

Responder->Initiator:            0 packets          0 bytes

但是同样的卡放在手机上都是正常的。同样的卡放在我司路由器上也是正常的。后将手工配置的默认路由去掉后正常了。

经确认由于终端卡UE attach 4g网络建立默认承载的时候,核心网分配地址的方法不一样.核心网pgw使用dhcp分配地址,就会自动下发默认路由.如果是通过nas sm信令分配地址,就不会下发默认路由；

解决方法

将手工配置的静态路由去掉

内容来源：知了社区，基于知识共享署名-相同方式共享3.0中国大陆许可协议
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