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I know that others will probably have a better answer than mine. But a shot in the dark could be clearing your arp / cam.
Well I think I figured out the problem (with some help.)
My router whose ARP cache the switch port mapper queries sits outside my firewall (which I assume most of yours do also?) So, that router's ARP cache associates all IP addresses with the M.A.C. of the firewall not of the devices themselves, so when Switch port mapper maps IPs to M.A.C.s it maps them all to that one M.A.C. which is on one port of one switch. How do I get around this??
Put a router on the inside of your firewall... preferably between your Network Management station and the network segment you want to map... run ping sweep of your internal addresses then fire up Switch port mapper using the switch and the internal router and voila.. ip and mac addressing in a nice spread sheet...
I found that the old version (v5.1.37 Sept 2002) works much better in resolving ip addresses from the mac addresses.
The new verion (v5.2.0 June 2003) gives me alot of mac addresses but returning almost no ip addresses.
I can run both side-by-side and have very different results.
I'll stick to the older version..
That was my 2¢
I also saw this with the beta version. No ip address or host names. It worked with the one in the toolkit.