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Linux Network Errors

Discussion in 'Software' started by LAGMonkey, 16 Apr 2009.

  1. LAGMonkey

    LAGMonkey Group 7 error

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    Right, After a clean restart and a change of ethernet cables to my Cable modem im still getting network errors,

    my ifconfig is as follows, note the RX errors

    eth1 Link encap:Ethernet HWaddr 00:19:66:34:FE:B7
    inet addr:xx.xxx.xxx.xx Bcast:255.255.255.255 Mask:255.255.254.0
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:1408933 errors:13 dropped:18 overruns:5 frame:0
    TX packets:775367 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:1538122328 (1.4 GiB) TX bytes:87991901 (83.9 MiB)
    Interrupt:201 Base address:0xa400

    The above is my 100meg ethernet onboard ethernet,

    01:05.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+

    If the trend continues as it did before, ill continue to get errors but i dont know what they could signify. Could it be the cable modem causing me problems?

    Any help would be appreciated, everything seems to be working but errors are errors, and its starting to bug the crap out of me.

    Simplified Network topology = linux router <----> cable modem <-----> internet
     
    Last edited: 20 Apr 2009
  2. LAGMonkey

    LAGMonkey Group 7 error

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    new cable attached to the modem and ive got the following after 3 days uptime...

    eth1 Link encap:Ethernet HWaddr 00:19:66:34:FE:B7
    inet addr:xx.xxx.xxx.xx Bcast:255.255.255.255 Mask:255.255.254.0
    inet6 addr: fe80::219:66ff:fe34:feb7/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:8490958 errors:65 dropped:215 overruns:22 frame:0
    TX packets:4828463 errors:0 dropped:0 overruns:0 carrier:0
    collisions:0 txqueuelen:1000
    RX bytes:4025048665 (3.7 GiB) TX bytes:432520920 (412.4 MiB)
    Interrupt:201 Base address:0xa400
     
  3. C-Sniper

    C-Sniper Stop Trolling this space Ądmins!

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    is there any output in DMESG that looks out of the ordinary?
     
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  4. Zoon

    Zoon Hunting Wabbits since the 80s

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    RX packets:8,490,958
    errors:65
    dropped:215
    overruns:22
    frame:0

    65 is 0.0007655202157400849% of 8,490,958
    215 is 0.0025321053289864347% of 8,490,958
    22 is 0.00025909914994279797% of 8,490,958

    I work in networking, have done for years now, and I would recommend that any fraction of a percent packet loss is definitely not going to impact you, and would be worth ignoring :)

    If however you're interested in resolving this nonetheless, I can give you this information. It may not be 100% accurate as I deal with Cisco, not Linux :)

    - Errors are frames which fail checksums
    - Dropped packets are usually due to input queues being overloaded
    - Overruns are usually buffer overruns

    The drops/overruns will usually coincide to a point. If they were clocking at a much higher rate I'd be inclined to say you're using more bandwidth than you've got, but since its such a minute level my general conclusion would be as per above: its well within tolerance, you won't see any visible effect, and should probably ignore it :D
     
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  5. LAGMonkey

    LAGMonkey Group 7 error

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    plus points for zune as explaining what errors, drops and overruns mean, and i suppose you are correct, it isnt very significant at the moment so i guess i can ignore it.

    as for the DMESG...

    I hadnt throught of looking at that, so plus points for you too C-Sniper.

    There are quite a few unknown protocols in the DMESG so i can guess that the errors etc are related to that, ill update my L7-protocol definitions later on today after ive bung in the new hard-drive and memory.
     
  6. Zoon

    Zoon Hunting Wabbits since the 80s

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    Yay points! You're welcome :)
     

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