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Xsmael
Asked: 2014-08-22 06:25:01 +0800 CST

how to get ip address of a PPP(Point-to-Point Protocol) network interface?

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I have a Linux machine with two network interfaces, and I'd like to get the IP address of the PPP interface w1g1 but it doesn't show up in ifconfig. There is a public IP on the PPP interface, but there is no internet connection, I'm trying to troubleshoot but I need to get the IP address of the interface and I can't.

ifconfig :

eth0      Link encap:Ethernet  HWaddr 00:30:48:8D:F0:2C
          inet addr:192.168.2.254  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: fe80::230:48ff:fe8d:f02c/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9970 errors:0 dropped:567 overruns:0 frame:0
          TX packets:4338 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:1441024 (1.3 MiB)  TX bytes:915814 (894.3 KiB)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:675 errors:0 dropped:0 overruns:0 frame:0
          TX packets:675 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:50659 (49.4 KiB)  TX bytes:50659 (49.4 KiB)

w1g1      Link encap:Point-to-Point Protocol
          UP POINTOPOINT RUNNING NOARP  MTU:240  Metric:1
          RX packets:748994 errors:0 dropped:0 overruns:0 frame:0
          TX packets:748992 errors:0 dropped:0 overruns:0 carrier:3
          collisions:0 txqueuelen:100
          RX bytes:179758560 (171.4 MiB)  TX bytes:179758080 (171.4 MiB)
          Interrupt:177 Memory:f881c400-f881e3ff

w1g1 is connected to a modem by an RJ45<->Serial cable and the modem is connected to the phone line. The modem is a NOKIA DNT2Mi you can see it here

Routing table :

192.168.2.0/24 dev eth0  proto kernel  scope link  src 192.168.2.254
169.254.0.0/16 dev eth0  scope link
default via 192.168.2.180 dev eth0
networking

2 Answers

  1. You didn't say what distribution you are using, but it looks like your w1g1 interface does not even have an IP address.

    My suggestion is to bring pppd down and restart it.

    On most distributions, the easy way is to use these commands:

    ifdown w1g1
ifup w1g1

    If that doesn't work and you are not trying this remotely, you might want to stop all networking and restart it:

    service network stop
service network start
    • 1

  2. My answer was deleted, I cannot comment, so here I try again:

    Run:

    ip addr show

    or

    ifconfig -a

    Maybe you are just looking at the wrong interface? Look for the interface with the IP that you can ping.

    A google search for "w1g1" resulted in stuff like:

    your PPP interface will come up as w*g1ppp. (for example w1g1ppp)

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