Troubleshooting connection loss (novice question)

I run Fedora 7 and use Verizon DSL. My modem is a Westell 6100-E90 modem/router. My DSL connection usually runs well, but about once every seven to ten days I lose my Internet connection. I can regain my connection by rebooting Fedora. I've not been able to regain my Internet connection without a reboot (e.g. "service network restart" hangs).

I'm trying to troubleshoot this loss of connection. I've collected a bunch of troubleshooting info. I'd like to know what is the next troubleshooting step.

Following is what I've got so far:

Modem status: the DSL LED is solid green. The Internet and Ethernet LED's are blinking green. I interpret this as meaning that I've not lost sync, and that the modem is actually transmitting data to the Internet.

NIC LEDs: NIC is Intel Pro/100 M with two LEDs. The LEDs are both lit. The 100Mb LED is solid green. The LINK/ACT LED is blinking green. The status of these LEDs is the same as when I have an Internet connection.

GKrellm: The eth0 monitor shows zero activity. When I have an Internet connection, the eth0 monitor shows continuous activity, even when I'm not accessing anything.

KNetstats monitor: (analogous to the Gnome desktop applet). This shows I'm disconnected. The icon has a red circle containing a white "X".

dmesg: NETDEV WATCHDOG: eth0: transmit timed out

ifconfig: eth0 UP, BROADCAST, and MULTICAST, but *not* RUNNING. IP address 192.168.1.47

ethtool eth0: link detected: yes

ping 192.168.1.47 OK

ping 192.168.1.1 Destination host unreachable. (I don't know if there is any point in pinging 192.168.1.1)

What troubleshooting step should I do next?
.

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