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#1 2009-06-24 13:34:38

Verminoz
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From: Greece
Registered: 2008-08-17
Posts: 47
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Strange network problem

Here's the thing. I use my laptop at home or at the uni lab. I have Archlinux and Windows Vista. Suddenly and for no apparent reason Firefox and pacman cannot resolve addresses when I connect at home (at the uni everything is fine). I checked the DNS servers and they're correct (all the other PCs at home work just fine under both windows and linux). The strange thing is that I can ping all addresses (eg. www.google.com) but firefox cannot access them. MSN works fine, some addresses still work fine in firefox but most of them don't work. I can ping them but I can't load them in any browser. Windows Vista does not have a problem at all. All the other PCs have no problem at all. It's crazy!!!!

(The problem seems to be the resolving of the addresses. If I ping an address and then use the IP address to load the page in firefox it works fine)

Any ideas? Help please...

Last edited by Verminoz (2009-06-24 14:19:11)


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#2 2009-06-24 14:34:29

ralvez
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From: Canada
Registered: 2005-12-06
Posts: 1,694
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Re: Strange network problem

Are you using IPV4 or IPV6? Is it possible that IPV6 is active and therefore at home you only get addresses that are compatible with that standard?

R.

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#3 2009-06-24 16:39:21

Verminoz
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From: Greece
Registered: 2008-08-17
Posts: 47
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Re: Strange network problem

IPv4 I think. You mean IPv6 could be active in the router settings? I don't think that's the problem beacuse all the other PCs at home are fine with the same DNS servers


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#4 2009-06-24 19:01:48

Bogart
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From: Madrid, Spain
Registered: 2005-06-22
Posts: 272

Re: Strange network problem

It seems that on the last few days there are many people having problems with DNS not resolving, but no one has an answer yet. Did the problem start after an upgrade? Or did you change something in the network setup?

Here are other topics from last few days, maybe if all people having the problem work together in one thread it will be easier to identify the problem:

http://bbs.archlinux.org/viewtopic.php?id=73989
http://bbs.archlinux.org/viewtopic.php?id=74480
http://bbs.archlinux.org/viewtopic.php?id=74582

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#5 2009-06-24 20:04:31

Verminoz
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From: Greece
Registered: 2008-08-17
Posts: 47
Website

Re: Strange network problem

No the problem probably started after an upgrade although not sure which one. I never change my network settings except uncommenting the correct and commenting the incorrect lines in /etc/rc.conf depending on where I am (home or laboratory).

I went through pacman's log and at first I thought wicd (recently updated) might have caused the problem (Note here that for some reason wicd kept popping up at startup although it was neither in my DAEMONS list nor in KDE's startup services!!!!). I uninstalled wicd but the problem remains. I also tried downgrading tcp_wrappers (recently updated too) but didn't work either.


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#6 2009-06-25 06:56:26

Veovis Muad'dib
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Registered: 2009-06-12
Posts: 43

Re: Strange network problem

Bogart wrote:

It seems that on the last few days there are many people having problems with DNS not resolving, but no one has an answer yet. Did the problem start after an upgrade? Or did you change something in the network setup?

Here are other topics from last few days, maybe if all people having the problem work together in one thread it will be easier to identify the problem:

http://bbs.archlinux.org/viewtopic.php?id=73989
http://bbs.archlinux.org/viewtopic.php?id=74480
http://bbs.archlinux.org/viewtopic.php?id=74582

I had made a new thread because mine seemed different than everyone else's.  However, this guy seems to be having the same exact problem.


Verminoz: I just had the exact same problem: I fixed it a little bit ago, and was about to post in my thread, so I'll post here too.

What I had to do was change resolv.conf to this:

#These addresses are for OpenDNS, put in anything you'd like here.
#OpenDNS solved my issue though, so try with them first, then change it.
nameserver 208.67.222.222
nameserver 208.67.220.220

If you're using DHCP, you also have to add a -R to the DHCP call in a config file, (if someone could help me out here in remembering which one please).  The reason you need it is that it will prevent DHCP from overwriting the resolv.conf with the gateway address.

I'm using a motorola router/modem that I got with Qwest service, but for some reason I can't grab DNS info from it in Arch.  That's all the problem is for me.  What router are you using Verminoz?

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#7 2009-06-26 21:19:15

Samuel from beteigeuze
Member
From: Bavaria/Germany
Registered: 2009-06-06
Posts: 29

Re: Strange network problem

It should be the /etc/conf.d/dhcpcd file where you have to add the "-R" option in order to remember the DHCP-Client not to override your config.


There are 10 types of people: those who understand binary and those who don't.

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#8 2009-07-01 15:47:50

Verminoz
Member
From: Greece
Registered: 2008-08-17
Posts: 47
Website

Re: Strange network problem

Thanks for the remarks. Personally, I don't use DHCP. Anyway, the workaround is fine indeed. By adding the OpenDNS addresses to resolv.conf everything is fine with all internet addresses. However this is a workaround NOT a fix, which means that the problem or bug remains to be found and fixed.

Thank you smile


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