Are you sure that the "stock" firmware doesn't ? This comes as a surprise -- I never worked with the Linksys models but I have an "old", cheap 802.11b router (a rebadged taiwanese Trendnet) which is nothing special but does this out of the box (heck, it even knows how to send its log info to a remore syslog !). There are many bugs in its firmware (MAC address filtering for example) but those two work...