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Old 05-09-2010, 12:05 PM   #1
ppggff
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Registered: May 2010
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Question Wierd network problem with Slackware64 13.0


I installed slackware64 13.0 on my Dell D630 laptop.
Recently I found a wierd network problem:

Sometimes, after couple of hours, I nearly cannot open
new websites. It takes so many time to open a page.
(I tried in firefox, lynx and konqueror.)

But some other connection still work, such as KRDC.

I tried nslookup and dig, they all works very
well, so the DNS is ok.

But ping works very slow with some url if I use the
domain name. And it runs very fast with the ip
of that url. So, maybe there is some problem with
the DNS, or something else.
ping result is:
1) ping by domain name
53 packets transmitted, 7 received, 86% packet loss, time 176196ms
rtt min/avg/max/mdev = 17.714/19.668/26.758/3.023 ms

2) ping by ip (same target)
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 19.052/22.237/25.422/3.185 ms

Restart the network with rc.inet1 cannot fix this
problem. Only I can do is reboot the computer.

I tried a lot to solve this problem. May be it's
a kernel(2.6.29.6) bug? Or the bug of my wireless card
driver(BCM 4311)? Or something else?
Who has the same problem, or knows the solution?

Thanks

Last edited by ppggff; 05-09-2010 at 12:24 PM. Reason: Add more details.
 
Old 05-09-2010, 12:15 PM   #2
damgar
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Registered: Sep 2009
Location: dallas, tx
Distribution: Slackware - current multilib/gsb Arch
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Maybe you are having problems with your DNS server. Try setting a static DNS server other than your ISP's.
 
Old 05-09-2010, 12:22 PM   #3
ppggff
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Registered: May 2010
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Quote:
Originally Posted by damgar View Post
Maybe you are having problems with your DNS server. Try setting a static DNS server other than your ISP's.
Thanks.
I don't think it's problem of the dns server.

Another computer with WinXP works well with the
same dns server. And after reboot, all works
well again.

When the problem happened, ping got a result as follow:
1) ping by domain name
53 packets transmitted, 7 received, 86% packet loss, time 176196ms
rtt min/avg/max/mdev = 17.714/19.668/26.758/3.023 ms

2) ping by ip (same target)
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 19.052/22.237/25.422/3.185 ms

Thanks
 
Old 05-09-2010, 12:44 PM   #4
catkin
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Registered: Dec 2008
Location: Tamil Nadu, India
Distribution: Servers: Debian Squeeze and Wheezy. Desktop: Slackware64 14.0. Netbook: Slackware 13.37
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nslookup and dig are OK at resolving hostnames; ping is not ... what do /etc/resolv.conf and /etc/nsswitch.conf look like?
 
Old 05-09-2010, 03:16 PM   #5
ppggff
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Registered: May 2010
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Quote:
Originally Posted by catkin View Post
nslookup and dig are OK at resolving hostnames; ping is not ... what do /etc/resolv.conf and /etc/nsswitch.conf look like?
Thanks.
The /etc/resolv.conf is generated by DHCP, and the nsswitch.conf
is never edited before.

All these configure files are ok, because reboot can fix the
problem. (name server is same) And, the problem happens after
using normally couple of hours.
 
Old 05-09-2010, 03:45 PM   #6
damgar
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I believe there was a recent change in dhcpd versions from 13 to current. Maybe something in that?
 
  


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