Static (incorrect) ARP entry

From: Rolf Mendelsohn (rolf_mendelsohn_at_hotmail.com)
Date: 11/04/03

  • Next message: Konrad Heuer: "Re: "FreeBSD have a very low default file handle limit"?" 
    To: freebsd-questions@freebsd.org
Date: Tue, 04 Nov 2003 10:21:19 +0200

    Hi Everybody,

    I have a problem with a local ISP who use Alvarion WALKAir 1000 equipment,
    which does a sort of 50 / 50 routing / bridging.

    The below is actually public addess space, just using 10 for clarity's sake:

    Default Gateway: 10.8.16.1

    The provider has given me the following information (changed to private IP
    space for security reasons):

    Default Gateway: 10.8.16.1
    My IP's: 10.8.23.121 - 126
    Subnet Block: 10.8.23.120/29

    This works 100% on a windows machine but does not work at all on any unix
    machines.

    When my Windows 2000 box is plugged in I get the following:

    C:\>arp -a

    Interface: 195.8.23.121 on Interface 0x1000003
      Internet Address Physical Address Type
      10.8.16.1 00-03-40-9c-0a-99 dynamic

    C:\>netstat -nr

    Route Table
    ================================================================
    Interface List
    0x1 ........................... MS TCP Loopback interface
    0x1000003 ...00 02 3f 7e 49 40 ...... Intel 8255x-based Integrated
    Fast Ethernet

    ================================================================
    Active Routes:
    Network Destination Netmask Gateway Interface
    Metric
              0.0.0.0 0.0.0.0 10.8.16.1 10.8.23.121 1
            127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1
         10.8.23.120 255.255.255.248 10.8.23.121 10.8.23.121 1
         10.8.23.121 255.255.255.255 127.0.0.1 127.0.0.1 1
         10.8.23.255 255.255.255.255 10.8.23.121 10.8.23.121 1
            224.0.0.0 224.0.0.0 10.8.23.121 10.8.23.121 1
      255.255.255.255 255.255.255.255 10.8.23.121 10.8.23.121 1
    Default Gateway: 10.8.16.1
    ======================================================================
    Persistent Routes:
      None

    How do I get a Unix machine to misbehave and accept a gateway which is not
    on it's connected subnet??? Is this happening because on Proxy ARP?

    Any help would be most appreciated.

    Regards,
    Rolf Mendelsohn
    IT Consultant (CCNP)
    Cyber Operations Angola:
    Mobile: +244 (0)92 524 981

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