Junos OS

Hi,

Has anyone ever seen the following issue:

We have successfully registered our first subscriber for testing and can complete the following from the CPE:

Ping to URL: Success (Example.... ping www.google.co.uk)

Ping to address: Success (example .... ping 8.8.8.8)

nslookup: Success

 Here are the issues:

Open a browser and type the address into the address bar: Failure

Connect to facebook: Success

Connect to youtube: Success

Connect to google and search: Success

Click on link from search: Failure

It's like some sites work and the majority do not. I have tested from both directions with regards to possibility of loops and there are none. Traceroutes are correct. There are no restrictions from an HTTP or HTTPS perspective (or facebook and youtube would not work). I have filters in place for SSH and other non related protocols.

This is a strange issue I have not seen before. I am using a technicolour CPE.

Thanks

I've seen this behavior when there is an mtu or mss issue on the path before.  Check these from the cpe up.

Hello,

In addition to what has been said, GOOG ignores the TCP MSS sent in client SYN and uses max 1470B packets.

GOOG also advertises TCP MSS 1380B for self.

AFAIK, it also uses max 1380B UDP packet size for QUICC (think Youtube video streaming).

Akamai and Amazon do similar thing.

So, find a knob on Your CPE to adjust TCP MSS down to at least 1400 B, then re-test and report back.

HTH

Thx

Alex

Hi all,

Just got in from long weekend. Got a call yesterday stating that the user had adjusted their MTU to 1492 and it all worked. It was indeeed an MSS/MTU issue on the CPE. All is working perfectly.

Thanks

Good news, too bad he didn't tell you before the long weekend you would have had a more relaxing time.