Linux and ARP flooding. - Networking

This is a discussion on Linux and ARP flooding. - Networking ; Hi, In a local LAN network I observe an insane amount OF ARP requests and replies. I see ARP requests coming from Suse 10.1 Linux workstations, sometimes like a real flood, some hundred in a second. Examle of a network ...

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Thread: Linux and ARP flooding.

  1. Linux and ARP flooding.

    Hi,

    In a local LAN network I observe an insane amount OF ARP requests and
    replies. I see ARP requests coming from Suse 10.1 Linux workstations,
    sometimes like a real flood, some hundred in a second. Examle of a
    network sniff on a host, filtered with it's own MAC address:

    tcpdump -n arp and ether host 00:18:8B:2B:C2:A5
    ....
    16:56:49.209922 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
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    adnwsrs25.zh.example.com
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    16:56:49.217504 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217535 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217573 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217606 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217643 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217680 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217717 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217753 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217801 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217824 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217860 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217897 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217947 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.217970 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.218005 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.218047 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.218080 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:49.218116 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:50.209935 arp who-has gilera.example.com tell
    adnwsrs25.zh.example.com
    16:56:50.210029 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210043 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210048 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210051 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210055 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210059 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210063 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210066 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210070 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210081 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210085 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210089 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210093 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210096 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)
    16:56:50.210107 arp reply gilera.example.com is-at 08:00:20:fe:ca:66
    (oui Unknown)

    The one who replies the ARP requests is our backbone layer 3 switch
    from Extreme Networks. Is this behaviour normal? I would expect that
    one ARP broadcast request and one reply should be enough. Why are
    there so many?

    Thanks in advance for help.

    Best regards,
    Bernd


  2. Re: Linux and ARP flooding.

    Interestingly this was caused by a network loop on one of our
    switches. One cable was plugged in into two ports. But I don't
    understand why this causes this behaviour.

    Bye
    Bernd



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