On Mon, 2004-11-29 at 10:51 -0600, Aleksandar Milivojevic wrote: > I have a problem with my Fedora box and cable modem. I'm not sure if > the problem is on my side, or ISP side (Shaw cable). Of course, ISP > claims it is not them, what else would you expect ;-) > > Basically, what happens is that dhclient obtains IP address for my > external interface. Than everything works fine for some period of time > (less than a half an hour), and after that I loose all Internet > connectivity. If i restart dhclient (for example using "ifdown eth0; > ifup eth0"), my PC gets IP address reassigned (in my case, I'm always > getting same address, 24.79.220.4), everything works for a while, and > than it stops again. > > Something like this happened about a month ago, and restarting the > interface solved the problem. Yesterday it started to happen again, but > this time restarting the interface solves the problem for about a half > an hour, and than there it is again... > > I have two more interfaces on this Linux box. One is toward my internal > network, and another is toward DMZ. Those two have static IP addresses, > and everything seems to be working fine with those two. > > What I have observed when this happens, is that I can sometimes ping the > router on ISP side (24.79.220.1), but nothing else. Sometimes. > Sometimes ping to ISP router doesn't work at all, or works partially > with large percentage of lost packets (95-99% range). > > Anybody else had similar problem? > This description is typical of a noisy or marginal quality cable. I have seen this when something else is attached to the same cable, or when a connector on a cable end is going bad. What you did not say, is whether you have power cycled the modem. This often works for me. I also have seen similar problems when the modem was losing sync, and in one case when it was failing. That time, a new modem fixed it. Of course, as we all know; weather, rain, etc. has no affect on signal quality on cable. It could not possibly be the cable signal. <sic>. When all else fails, if you own the modem try a replacement. If you are renting the modem from the cable company, try a replacement.
