Can't connect via ethernet after iBook wakes up from sleep

I'm running 10.4.0 on a 1.33 GHz G4 iBook. Since buying the computer in 2005, I've been connecting to the internet in various locations via AirPort, though I have hooked my iBook up to ethernet connections in the past and had no problems.
Recently I moved to a university where I must connect via ethernet, as the wireless network doesn't extend to the areas where I do most of my work. I bought a new cable. Much of the time, my connection is fine. But frequently I am unable to connect to the internet at all via ethernet, and I've noticed that it's always after I've woken the computer up from sleep. I've tried various ridiculous "kick the car and maybe it will start" techniques like unplugging the cable at both ends and waiting, restarting five or six times in a row, etc., and it starts connecting eventually, but I have NO idea why or why not. When I check my network preferences, I get the message "Built-in Ethernet is currently active and has the IP address [xxx.xxx.x.xxx]. You are connected to the Internet via Built-In Ethernet." But I'm not. What's going on here?

Sorry, meant to indicate an IP address without giving the exact numbers, and it came up as an HTTP address. My network connections system preference panel indicates a normal IP address. (And it's not self-assigned.)

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