Re: Bridges

From: Peter Jeremy (PeterJeremy_at_optushome.com.au)
Date: 09/30/05

  • Next message: Ceri Davies: "Re: Bridges" 
    Date: Fri, 30 Sep 2005 19:56:49 +1000
To: freebsd-arch@freebsd.org

    On Thu, 2005-Sep-29 08:44:09 +0930, Wilkinson, Alex wrote:
    >What is the difference between a "per-host MAC address" and a "per-NIC
    >MAC address" ?

    All NICs have a unique MAC address. This address can be over-ridden by
    the host if it needs to have the same MAC address appear on multiple
    interfaces.

    Of the two cases I mentioned: DECnet changes all MAC addresses to one
    beginning AA0055 where the low bits are the host's DECnet address.
    This removes the need for IP's ARP since the source host can determine
    the destination host's MAC address without needing to ask the network.

    Some versions of Solaris with some NICs (definitely Solaris 8 with
    Cassini NICs) associate a MAC address with the host, rather than the
    NIC. I'm less certain of the rationale for this. 

    -- 
Peter Jeremy
_______________________________________________
freebsd-arch@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-arch
To unsubscribe, send any mail to "freebsd-arch-unsubscribe@freebsd.org"
  • Next message: Ceri Davies: "Re: Bridges"

    Relevant Pages

    • Re: Cannot Ping Beyond Default Gateway & DHCP Server
      ... That computer has two ethernet NICs: one from Intel, and one from Linksys. ... He says he has never had to change a MAC nor tell the home office to change one. ... My assumption now is that this MAC control is occurring in the cable modem, and that clearing it with power off causes it to loose its previously-stored value. ... Network Diagnostics shows pings to his IP, Default Gateway, and DHCP Server work, but pings to DNS servers fail. ...
      (microsoft.public.windowsxp.network_web)
    • Re: Mac 10.4 OS on G5
      ... I called into the SBS Team Support yesterday because I was getting bombared ... changed before the Mac problem begin. ... the dual NICs on the server from teaming as Load Balance to Fault Tolerance ...
      (microsoft.public.windows.server.sbs)
    • Re: RIS, same GUID, duplicates, Dell GX60s
      ... Hence the requirement of the RIS boot disk. ... At this stage, it can't find it, so decides to get the MAC ... > these nics part of the motherboard or pci devices? ...
      (microsoft.public.windowsxp.setup_deployment)
    • Re: Multiple external interfaces
      ... >> It sounds like you need to set up routing tables to have one segment get ... see in outgoing frames/packets -- they never see extB's IP or MAC). ... All other dual line setups to a single ISP I've seen required static ... external NICs and just one internal NIC? ...
      (comp.os.linux.networking)
    • Re: MAC address
      ... *All* NICs have the MAC hard coded. ... it is up to the NIC manufacturer to ... provide OS drivers that can over-ride the hardware MAC with a software MAC. ...
      (microsoft.public.win2000.general)