Why are the pre-set static ARP entries?


  1. awr7162
    Posts : 2
    Windows 7 Home Premium 64 bit
       New #1

    Why are the pre-set static ARP entries?


    When viewing my arp table ('arp -a'). There are all the computers on my lan. But there are also a few static entries. I attached a screen shot of it.

    Why are there arp table entries for 224.0.0.22, 224.0.0.251, etc. and what are they for?
    Attached Thumbnails Attached Thumbnails Why are the pre-set static ARP entries?-capture.png  
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  3. GeneO
    Posts : 1,653
    Windows 10 Pro. EFI boot partition, full EFI boot
       New #2

    The 224 addresses are multicast addresses - packets sent to those address will be received my multiple hosts (or routers).

    224.0.0.22 is the IGMP (Internet group Management protocol). 224.0.0.2 for instance is all routers broadcast.

    224.0.0.250-255 are unassigned and I think are used on the local network for some windows services multicasting (e.g. http://en.wikipedia.org/wiki/Link-lo...ame_Resolution )

    http://www.nblug.org/firewall/intern...cast-addresses

    EDIT: I guess I should add that your computer is listening on 224.0.0.252 for multicast packets on that address. That is why it is static.
    Last edited by GeneO; 08 Sep 2012 at 22:38.
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  4. awr7162
    Posts : 2
    Windows 7 Home Premium 64 bit
    Thread Starter
       New #3

    Thanks!
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