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  1. #1

    network problem with eth0 on linux

    I have a laptop, the wifi is OK, but for wired network, if I'm using windows, it is OK. But with linux, yesterday, it is OK, but today I can't access the network through eth0(in windows, it is OK), what are potential problems?

    BTW, yesterday I modified MTU from 1406 to 500, but then modified it back to 1406.

    eth0 Link encap:Ethernet HWaddr 5C:26:0A:2B:B8:06
    inet addr: Bcast: Mask:
    inet6 addr: fe80::5e26:aff:fe2b:b806/64 Scope:Link
    RX packets:21221 errors:0 dropped:0 overruns:0 frame:0
    TX packets:1355 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:3710568 (3.5 MiB) TX bytes:130299 (127.2 KiB)
    Interrupt:20 Memory:f5400000-f5420000

    additional information: 1 it seems it is from dhcp coz I didn't do any configuration for the ip address, and it is a public IP. but the ip is fixed

    2 I think the /etc/resolv.conf is fine, coz previously the network is fine

  2. #2
    Linux Enthusiast
    Join Date
    Dec 2011
    Turtle Island West
    OK. I'm no network guru or anything, but I do know that playing with ifconfig is for network gurus *only*. Any changes you make there affect all your communications and everything around you.

    My best guess? I think you've confused your router and other things by tweaking your MTU. Now it thinks your PC speaks Martian Dialect #43 with a stuttering lisp, and it's deliberately ignoring you.

    If you're going to play around with a network interface, get a 2nd NIC and play with that, so you don't get a crippled primary interface.

    I hope someone else has some more constructive advice.

    BTW my MTU is 1500.

    Peace and cheer.

  3. #3
    Linux Guru Lazydog's Avatar
    Join Date
    Jun 2004
    The Keystone State
    1. Is your setup running static IP or DHCP?
    2. If static what is your IP ADD and MASK
    3. IF DHCP what is your IP
    4 Post the output from 'route -n'


    The adventure of a life time.

    Linux User #296285
    Get Counted

  4. $spacer_open

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