i am having a problem with PING commands suddenly not working (returning nothing but "request timed out"). the connection itself is fine -- i can browse the internet, send/retrieve email, do FTPs, whatever -- it's just the PING command that won't work. if i power reset the modem or the router, PINGs will start working again. but after several hours, inevitably they start failing. what could be causing this?
relevant hardware is a Motorola SURFBoard modem and Linksys BEFSR41 router, ISP is Charter.