nanog mailing list archives

Re: Hardware capture platforms


From: Paul Jakma <paul () clubi ie>
Date: Fri, 1 Aug 2008 15:46:41 +0100 (BST)

On Wed, 30 Jul 2008, Jon Kibler wrote:

However, there is a problem with your specification: No hub (that I am
aware of) can do 1Gbps. All hubs are 10/100 AFAIK.

GigE is PtP at the physical-layer by the IEEE 802.3ad specification. It's just not possible to have a dumb, GigE hub. You have to have a switch that can be told to L2-forward everything to one or more ports (e.g. through a port-mirroring feature, or by disabling MAC learning).

Also, though probably not terribly relevant, various switches have various bugs/malfeatures that cause them to consume certain kinds of frames rather than forward them (e.g. consuming all or certain kinds of ISO frames).

regards,
--
Paul Jakma      paul () clubi ie        paul () jakma org       Key ID: 64A2FF6A
Fortune:
lisp, v.:
        To call a spade a thpade.


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