Recently had a Linksys WRT54G (v1.0) fail, so went to the closest store and purchased a replacement. My bad for not reading the press, as I brought home a v5 version.
With the latest available firmware, v1.00.6, I've discovered that the router doesn't properly support (of all things) traceroute - the first link returned in the trace is the destination address.
Here's a sample of what happens:
Trace(188.8.131.52) 1 184.108.40.206 1ms 0ms 0ms TTL: 0 (webgod.linksys.com ok)
This is a UDP based trace, and it never proceeds past the above. A Windows generated (ICMP based) trace yields similar results:
Tracing route to webgod.linksys.com [220.127.116.11] over a maximum of 30 hops:1