SPAN/Mirrored port usage

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http://serverfault.com – I have a HP ProCurve switch with 24 ports. If I set up port 24 to mirror port 1 (which goes to my router), can I use port 24 for normal LAN access as well as to run something like ntop or bandwidthd? Or does mirroring mean that the port can only be used to read the mirrored packets? MEaning a 2nd NIC is required for LAN access? (HowTos)