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Hi all, I want to understand the carrier field in the result of ifconfig command. So far I know carrier is a signal which indicates the present of physical connection ...
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  1. #1
    Just Joined!
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    ifconfig and carier


    Hi all,

    I want to understand the carrier field in the result of ifconfig command. So far I know carrier is a signal which indicates the present of physical connection on Ethernet port. Does it have this same meaning in ifconfig result? And if I see on my PC like

    #ifconfig
    eth0 Link encap:Ethernet HWaddr 00:0C:6E:4C:FC:5F
    inet addr:192.168.123.11 Bcast:192.168.123.255 Mask:255.255.255.0
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:22526 errors:0 dropped:0 overruns:0 frame:0
    TX packets:6196 errors:0 dropped:0 overruns:0 carrier:6196
    collisions:0 txqueuelen:100
    RX bytes:4006671 (3.8 Mb) TX bytes:1003982 (980.4 Kb)
    Interrupt:10 Memory:ed000000-ed001080

    Then what does the number 6196 mean? I already read ifconfig manual page but found no information.

    Thanks in advance

  2. #2
    Just Joined!
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    Re : ifconfig and carier

    Hi Hi,

    I can honestly say I don't know, but I do understand your confusion because I have been confused about this for ages.

    In FreeBSD I always know if there is a cable connected
    ------------------------
    Under FreeBSD 4.9 you will get this from a ifconfig


    ether0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MU LTICAST> mtu 1500
    inet6 fe80::202:b3ff:fed1:3cf0%ether0 prefixlen 64 scopeid 0x1
    ether 00:02:b3:d1:3c:f0
    media: Ethernet autoselect (100baseTX <full-duplex>)
    status: active
    ether1: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MU LTICAST> mtu 1500
    inet6 fe80::202:b3ff:fed1:3cf9%ether1 prefixlen 64 scopeid 0x2
    ether 00:02:b3:d1:3c:f9
    media: Ethernet autoselect (none)
    status: no carrier
    ------------------------
    I could nerver understand why my Linux box says

    eth0 Link encap:Ethernet HWaddr 00:80:AD:77:8A:F7
    inet addr:10.7.146.204 Bcast:10.7.146.255 Mask:255.255.255.0
    inet6 addr: fe80::280:adff:fe77:8af7/64 Scope:Link
    UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
    RX packets:3509050 errors:336 dropped:0 overruns:335 frame:335
    TX packets:3395885 errors:1 dropped:0 overruns:0 carrier:0
    collisions:429408 txqueuelen:1000
    RX bytes:2701089194 (2575.9 Mb) TX bytes:565276461 (539.0 Mb)
    Interrupt:10 Base address:0xdc00
    ------------------------

  3. #3
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    It is actually implementation dependent, however, A.F.I.K. carrier means that you have had such number of carrier lost since you did your last if-dwn / if-up. This value should represantate the number of packets that you have sent out-of-the-blue.

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