RE: Looking for switch recommendations ...

From: Chance Whaley (chance_at_dreamscope.com)
Date: 03/31/04

  • Next message: Luigi Rizzo: "do we support non contiguous netmasks ?" 
    To: "'Wes Peters'" <wes@softweyr.com>, "'Steven Stremciuc'" <steve@freeslacker.net>, <freebsd-net@freebsd.org>
Date: Wed, 31 Mar 2004 01:32:02 -0700

     
    > -----Original Message-----
    > From: owner-freebsd-net@freebsd.org
    > [mailto:owner-freebsd-net@freebsd.org] On Behalf Of Wes Peters
    > Sent: Tuesday, March 30, 2004 3:06 PM
    > To: Steven Stremciuc; freebsd-net@freebsd.org
    > Subject: Re: Looking for switch recommendations ...
    >
    >
    > Every switch that does port mirroring probably has some
    > problems related to port mirroring, because mirroring
    > typically cannot be done in hardware. If nothing else, you
    > can expect some degraded performance on the port(s) being
    > mirrored and on the port doing the mirroring, because the
    > packets have to be fondled by the CPU before they can be
    > switched. Even with a really fast processor, this will
    > increase the latency a bit.

    This is an untrue statement. There are several switch vendors that pride
    themselves on their wire-speed mirroring capabilities - specifically their
    ability to do it in hardware. Foundry's BigIron and the like comes to mind
    as a highly reliable and fairly inexpensive (subjective) switch that is very
    capable of doing multi-port wirespeed mirroring at line rate.

    .chance

    _______________________________________________
    freebsd-net@freebsd.org mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-net
    To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"

  • Next message: Luigi Rizzo: "do we support non contiguous netmasks ?"

    Relevant Pages

    • Re: about mirroring port
      ... >also keep in mind port mirroring on a switch for the most part isn't ... >port mirroring on it. ... >I think it usually just copies the traffic on the switch itself. ... Exploiting Web Applications- A Step-by-Step Attack Analysis ...
      (Focus-IDS)
    • Re: NIDS Recommendations in limited environment...
      ... what brand of switch are you using ... >> doesn't support the port mirroring functionality you seek? ... Why not use an SNMP script to verify that the mirroring is set and watch the ... to keep track of total ARP entries and uptime at the minimum. ...
      (Focus-IDS)
    • Switch Port Mirroring
      ... A while ago someone asked the list for the syntax for enabling port ... mirroring on his switch, thinking that this would be useful to us all I have ...
      (Focus-IDS)
    • Re: Installing a raid controller in a 9406-170
      ... are you wanting to switch from mirroring to raiding or are ... but didn't switch over to raiding. ... the expansion unit and has 4 drives in the base unit but no drives in ...
      (comp.sys.ibm.as400.misc)
    • (fwd) Captured Talks [tgraf@suug.ch]
      ... Software Packages for Solaris: http://www.blastwave.org/ ... Thanks to SWITCH for mirroring them and taking care of the ...
      (freebsd-current)