On certain Catalyst switches, the SPAN feature seems to allow the device connected to it to be able to generate packets back into the switch (through the "inpkts enable" command). I have a customer who is running a Websense Network Agent server (Internet monitoring/blocking) that needs to not only receive SPANed data, but also to transmit data back onto the LAN segment (described in the following Websense URL): http://www.websense.com/global/en/SupportAndKB/SearchKB/Display.php?faq=915&lang=English
Does anyone know if the SPAN feature on a 2924XL will support this (I'm dubious due to the lack of the "inpkts enable" command)? Would something like a 3550 support this capability?
Re: Allowing ingress traffic on SPAN port (2900XL)
We do this by using two network cards. The NIC connected to the SPAN port does the monitoring and a second NIC--connected to a 'regular' port does the blocking. This is also in the Quick Start Guide for Network Agent: "If a switch that supports bi-directional spanning is used, Network Agent can function successfully with a single Network Interface Card (NIC) performing both monitoring and blocking. If the switch
does not support bi-directional spanning, Network Agent must use separate NICs for monitoring and blocking."
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