http://www.pingplotter.com/netgear-rt314.html describes the issue: an inability to handle multiple ICMP requests. You can see what this does in Pingplotter at http://jamesrome.net/drupal/node/10.

The router actually crashes, because it will not accept new connection requests during the 1-minute dead times (even from other computers on the LAN). Existing connections seem to keep working, however.

If you turn off the multiple ICMP requests, in Pingplotter, the problem goes away. However, no program run on the LAN should be able to crash the router.