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Tiramisu

7 posts

Wannabe Geek


#41606 19-Sep-2009 17:43
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Hello,


Just wondering if anyone have successfully used a Cisco 800 series (850s or 870s) with ADSL or PPPoE through Fibre?


My problem would be some websites have problems loading correctly and timeouts.


I tried changing the Dialer interface MTU and IP MTU with TSS size.


Anyone having similar issues?


I can provide config if required.


Thanks,
Tira

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insane
2416 posts

Uber Geek

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  #257271 21-Sep-2009 00:44
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Are you using infinite fibre? an entry level vector service delivered over PPPoE ?

cr250bromo
222 posts

Master Geek


  #257284 21-Sep-2009 09:12
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I have used a Cisco 857 and 877 with ADSL and also a 1721 with PPPoE. Using DSL there is no need to change the MTU, but with PPPoE on the dialer interface used the commands "ip mtu 1492" and "ip tcp adjust-mss 1452" - can confirm this does work. Sounds like you've already done that though!

One option would be to try a ping using the don't fragement option and seeing if the mtu is actually smaller than 1492.

 
 
 
 


Tiramisu

7 posts

Wannabe Geek


  #258381 25-Sep-2009 16:37
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Hi,


Thanks for the reply.


I did 1492 for IP MTU and 1452 for TSS.  I still can't open http://yahoo.co.nz/ and http://techrepublic.com/ properly, most of the page won't load properly.


I can post config if requested.

quandum
204 posts

Master Geek


  #258462 26-Sep-2009 00:48
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Config? Please ## out sensitive info.




I would love to change the world, but they won't give me the source code

#BOFH

Tiramisu

7 posts

Wannabe Geek


  #258571 26-Sep-2009 16:06
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*Edit*

Deleted config.

quandum
204 posts

Master Geek


  #259174 28-Sep-2009 22:48
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Thanks, can you confirm what DNS you're using. i.e. is there a DNS server on the lan.
Also, can you please post a trace / ping from the router for a website that doesnt work?




I would love to change the world, but they won't give me the source code

#BOFH

Tiramisu

7 posts

Wannabe Geek


  #259790 30-Sep-2009 16:38
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Hi!

Yes we do have a DNS server (2003 SBS).

But after playing around with the settings (DNS), it worked.

What I did was changed our Primary and Secondary DNS "OpenDNS" to our local "ISP DNS" and websites started to laod up correctly.

Maybe OpenDNS doesn't like me. :-P I've been using it for a long time but never had this problem before.

But thank you for the effort in helping me solving this odd problem, really appreciate it.

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