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Old 10-08-2006, 02:55 AM   #1
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Distribution: CentOS, OS X
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dhcp becomes "unresponsive" for a moment, or completely

EDITED 09.10.2006: still no solution.

Problem: at random intervals the internet connection (to be honest, just the DNS solving?) seems to turn into vegetable; that is, pingnig ip addresses works, but trying to ping names or load up some site (using DNS-resolved name) fails. After some period of time, usually 10-20 minutes, the connection is perfectly fine again -- and after some time it turns vegetable again. This circulates all over again, with no solution in sight. No odd messages found in dmesg nor in /var/log/syslog, dhcp server answers to ping requests etc..

At first I thought it was dhcp (dhcpcd) which failed; I was unable to even create a pppoe-connection if I had dhcp enabled for eth0 (later got a connection working by setting eth0 not to obtain an address via dhcp, and use pppoe-setup to fetch ip using dhcp). It worked for a few days (or maybe I just didn't use the internet that much), then started doing this works-doesn't-works-doesn't-thing.

I also tried, as some of you who have read this post earlier, setting tcp window scaling value to zero with sysctl. At first I thought it worked, I had a good connection for a relatively long time (nearly 2 hours, compared to the 10-20 minutes that it was before), but after two days of testing I have to admit the problem has not gone away.

New ideas are welcome; I've read forums on the net, some people are having the same problem but no answers are found. It's not just Zenwalk that's having this problem, other distributions seem to have it too -- then again, I'm using the same version of Zenwalk many others have, and not everybody has the same problem. Using a static ip address doesn't show this problem (seemingly; I tried asking from some people), but everyone who has this problem is using dhcp to get an ip. Dhcpcd itself works, doesn't fault or anything, and the server answers to ping request (even when DNS resolution does not work). The ip in /etc/resolv.conf works, and gets fetched via dhcp upon new connection.

So, no weird signs except for the fact that the connection is not ok..

Last edited by b0uncer; 10-09-2006 at 07:50 AM.
Old 10-09-2006, 12:00 PM   #2
Registered: Aug 2005
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Personaly I would try a live CD like Knoppix, if that worked you could discount a number of things, like your ISP and any hardware/servers between you and your ISP.
There are a few DHCP programs for Linux, I would try dhcpclient and pump, I usually use dchpcd
Old 10-11-2006, 10:43 AM   #3
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I don't think it's a hardware issue or a problem with ISP, I've had other operating systems (including XP which is at the moment too, and Ubuntu) on board which have worked well..and I've used these same apps succesfully too, so I don't get what's wrong. The first time I installed zenwalk it worked flawlessly, only after the second install (from the same disc, the same way) things got odd.


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