Strange network problem accessing Ebay and versiontracker websites
All, I know this probably isn't the best forum for this question but I'd like to rule out a network problem before I tell a customer he has a PC problem. I run a small CLEC network that is single homed to BTN for transit. I have 3 sites all interconnected via DS3's and provide DSL services from each site. From anywhere on my network we have problem with Ebay and versiontracker.com but only on certain browsers. IE on a windows machine can access these sites without any problems, but Firefox on the same machine cannot open the websites (Ebay can be opened with addblocking software installed). On a Mac the only browser that works for these sites is Opera. With this knowledge I would say it is something with the coding on the website, but if I take the same machine and connect it to another network other than mine (Verizon, SBC and local municipal wifi have been tested) everything works fine. Can anyone give me any suggestions as to what routes to take to troubleshoot this? Logic tell me that is I have reach ability and one browser work but another doesn't it's a software problem with either the browser or the site, but being able to take the same machine to another network and have it work points to a whole different problem. Could this be a MTU issue? Shane Owens DNA Communications Inc 601 1st Ave Rochelle, IL 61068 work (815)562-4290 ext 201 mobile (815)793-3822
On Wed, 3 May 2006, Shane Owens wrote:
Can anyone give me any suggestions as to what routes to take to troubleshoot this? Logic tell me that is I have reach ability and one browser work but another doesn't it's a software problem with either the browser or the site, but being able to take the same machine to another network and have it work points to a whole different problem. Could this be a MTU issue?
It sounds like that is a possibility. Are the DSL users being served by PPPoE? Setting the IP MTU on your PPPoE access template, depending on whose gear you're using to provide the servide provider end of your DSL services, to 1492 may help. jms
For what's it's worth you could use ping and the "don't fragment" switch to test MTU sizes. Rob Justin M. Streiner wrote:
On Wed, 3 May 2006, Shane Owens wrote:
Can anyone give me any suggestions as to what routes to take to troubleshoot this? Logic tell me that is I have reach ability and one browser work but another doesn't it's a software problem with either the browser or the site, but being able to take the same machine to another network and have it work points to a whole different problem. Could this be a MTU issue?
It sounds like that is a possibility. Are the DSL users being served by PPPoE? Setting the IP MTU on your PPPoE access template, depending on whose gear you're using to provide the servide provider end of your DSL services, to 1492 may help.
jms
Sounds a whole bunch like you have a PMTUD (Path MTU Discovery) issue. Change the MTU on a host to be smaller and see if this fixes the issue... If it does, there are a bunch of networking tricks you can play to fix it for all of the customers. MSS rewrite is one, clearing the DF BIt on all packets is another -- these are various version of icky... W On May 3, 2006, at 2:22 PM, Shane Owens wrote:
All, I know this probably isn't the best forum for this question but I'd like to rule out a network problem before I tell a customer he has a PC problem. I run a small CLEC network that is single homed to BTN for transit. I have 3 sites all interconnected via DS3's and provide DSL services from each site. From anywhere on my network we have problem with Ebay and versiontracker.com but only on certain browsers. IE on a windows machine can access these sites without any problems, but Firefox on the same machine cannot open the websites (Ebay can be opened with addblocking software installed). On a Mac the only browser that works for these sites is Opera. With this knowledge I would say it is something with the coding on the website, but if I take the same machine and connect it to another network other than mine (Verizon, SBC and local municipal wifi have been tested) everything works fine.
Can anyone give me any suggestions as to what routes to take to troubleshoot this? Logic tell me that is I have reach ability and one browser work but another doesn't it's a software problem with either the browser or the site, but being able to take the same machine to another network and have it work points to a whole different problem.
Could this be a MTU issue?
Shane Owens DNA Communications Inc 601 1st Ave Rochelle, IL 61068 work (815)562-4290 ext 201 mobile (815)793-3822
-- "He who laughs last, thinks slowest." -- Anonymous
participants (4)
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Justin M. Streiner -
Robert Sherrard -
Shane Owens -
Warren Kumari