So, here is what I suggest you do. Run these diagnostics (or equivalents, if your hybrid system lacks these specific comamnds) both right after you get your initial DHCP lease and right after the router ceases to route:
ip link show
ip addr show
netstat -nr
ipchains -Lnv
-OR-
iptables -Lnv
Also see how long you are getting your DHCP lease assignments for; some ISPs these days are using nonsensically brief lease assignments, with renewals refused (so your address changes frequently) as a way of interfering with customer behaviors that they like to call "abuse" (but which usually just refers to people who try actually to *use* the bandwidth that the ISPs claim to be *selling* to them). I forget the file to check for this info, but it is probably in /etc/dhcp or some similarly-named directory.
My *guess*, from what you have told us, is that your DHCP lease is expiring, and an error occurs when getting the new one. Possible errors are (a) that whichever firewall package you are using blocks DHCP lease requests, or replies, after the initial lease is granted; (b) you get a new DHCP lease but the firewall does not update, so it has the wrong external IP address in all its rules. The failure if you restart is a bit puzzling (assuming you mean a power-down reboot), but it may indicate that you did not release some old lease, so the ISP will not assign you a new one ... it is diccifult to say for sure with so little info about your connection.
At 09:56 PM 11/4/02 +0100, Vaclav Bouse wrote:
Hi! I'm getting mad with this problem...I've got cable modem which provides me a connection to i-net. And I wont to use Dachstein/Bering router to share the net. Probably one of the standard using of this distro :-). I connected everything, configured modules, network cards, ... and try to connect. Everything was fine (I've got DHCP leased succesful and I was able to broswe the net - also at internal network, also directly from the router). But after a while (5-30min) the connection suddenly stops. Modem is stil blinking and I can ping router from local network (but ONLY the router, I losted the connection out). But from the router I can't ping out" If I restart Dachstein/Bering router, it can't lease new IP and the only way how to solve it is restart the cable modem! I tried to change pump lease time (shorter and longer) but without success. Everytime it screwes up after this period of time (10min in average). I really don't know what shall I do. I'm now thinking about completely disable the firewall function and set routing (with masqurade) for ALL trafic. Does somebody have any idea how to solve this problem? I can send also some LOG files.
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