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7 posts

Wannabe Geek

# 41606 19-Sep-2009 17:43
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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.


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2364 posts

Uber Geek


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

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.


7 posts

Wannabe Geek

  # 258381 25-Sep-2009 16:37
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Thanks for the reply.

I did 1492 for IP MTU and 1452 for TSS.  I still can't open and properly, most of the page won't load properly.

I can post config if requested.

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


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Wannabe Geek

  # 258571 26-Sep-2009 16:06
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Deleted config.

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


7 posts

Wannabe Geek

  # 259790 30-Sep-2009 16:38
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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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