[opensuse] Periodic problem resolving URLs?
This is a strange one that I cannot really pin down... is it my system? or is it my ISP? I think it's my ISP, but proving it is a bit hard. - Periodically (over the last 2 or 3 months), but with no fixed or at least identifiable pattern, I loose the ability to resolve URLs. If I open any installed browser (Firefox, Opera, Seamonkey etc) and browse to any random website, say.. YouTube, generally it opens immediately. But.. sometimes, I get nothing. Firefox will timeout at some point and tell me that the website is unreachable etc etc. Reloading during this timeout period does nothing. - When this problem pops up, all other web services continue to work fine... Torrents continue to download, FTP works fine, VoIP works perfectly... only resolving URLs fails. - The dropout lasts anywhere from a few seconds, to several minutes... and then when connectivity returns, it can continue to work for sometime hours.. and other times it'll drop off again right away. If I connect to one of my VPNs - my work VPN or my private one (a VPN service I subscribe to), I do not get any dropouts at all.. HTTP always works. This is what makes me think it's my ISP not me. So.... how do you go about showing that it's the ISP? I've contacted the ISP, and they say it's me... although they have provided me their DNS server addresses... they still think the problem is my side not theirs. Any ideas or suggestions? Could it be my side? if so, what can I look at to track it down? C. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 16/09/09 07:16, Clayton wrote:
- Periodically (over the last 2 or 3 months), but with no fixed or at least identifiable pattern, I loose the ability to resolve URLs.
There is no such thing as resolving urls..
If I connect to one of my VPNs - my work VPN or my private one (a VPN service I subscribe to), I do not get any dropouts at all.. HTTP always works. This is what makes me think it's my ISP not me.
Yeah, that's most likely because the VPN interfaces have a different Maximum transmission unit ;) Try reducing the MTU of the interface that connects directly to your DSL modem. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
- Periodically (over the last 2 or 3 months), but with no fixed or at least identifiable pattern, I loose the ability to resolve URLs.
There is no such thing as resolving urls..
Bad choice of words then. :-) How would you describe it?
Try reducing the MTU of the interface that connects directly to your DSL modem.
OK, via YaST Network settings I've dropped the MTU from 1500 (default) to 1492 (next down in the list). Easy enough to drop it until this problem goes away. What kind of thing would/could have changed though to introduce this annoyance? I've never before had to tinker with the MTU values. Is there something the ISP could/can do to "cause" this? C. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 16/09/09 08:07, Clayton wrote:
Try reducing the MTU of the interface that connects directly to your DSL modem.
OK, via YaST Network settings I've dropped the MTU from 1500 (default) to 1492 (next down in the list).
OK, So now I assume your openSUSE box is connected to the DSL modem... if this is not the case, you have to reduce the MTU in your home router or whatever is attached _directly_ to it.
Easy enough to drop it until this problem goes away. What kind of thing would/could have changed though to introduce this annoyance? I've never before had to tinker with the MTU values. Is there something the ISP could/can do to "cause" this?
http://www.netheaven.com/pmtu.html -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Try reducing the MTU of the interface that connects directly to your DSL modem.
OK, via YaST Network settings I've dropped the MTU from 1500 (default) to 1492 (next down in the list).
OK, So now I assume your openSUSE box is connected to the DSL modem... if this is not the case, you have to reduce the MTU in your home router or whatever is attached _directly_ to it.
The setup is: PC -> Router -> ADSL Modem -> ISP I've dropped the MTU to 1492 on the PC. The Router already was set to 1492 (the router has preconfig settings for my ISP). Now I guess the only thing to do is monitor and wait to see if it drops off again.
The scenario for "Joe" on this webpage is close to what I see. In the scenario, it's a single website with the problem whereas with what I see, it's all websites when it happens... and then it recovers shortly thereafter. C. -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Clayton wrote:
- Periodically (over the last 2 or 3 months), but with no fixed or at least identifiable pattern, I loose the ability to resolve URLs.
There is no such thing as resolving urls..
Bad choice of words then. :-) How would you describe it?
Try reducing the MTU of the interface that connects directly to your DSL modem.
OK, via YaST Network settings I've dropped the MTU from 1500 (default) to 1492 (next down in the list).
Easy enough to drop it until this problem goes away. What kind of thing would/could have changed though to introduce this annoyance? I've never before had to tinker with the MTU values. Is there something the ISP could/can do to "cause" this?
C.
ADSL generally uses PPP over ethernet. Ethernet limits packet size to 1500 bytes and PPP has a header, which uses some of those bytes and reduces what's available for traffic. Frame sizes must be in increments of 4 bytes. http://en.wikipedia.org/wiki/Point-to-Point_Protocol -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (3)
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Clayton -
Cristian Rodríguez -
James Knott