Possible MSS Issue
I have configured PE Router with MSS of 1410 and am testing. Some websites are loading fine and some are not. As a relevant test site to show th4e data with, I chose www.bbc.co.uk
The issue with the website is that the Writing appears immediately, as it should, but then I wait for 15 - 20 seconds for all images to appear at the same time. On other websites this can be even slower (even with basic connection). To make it clearer, the websites have also been tested when cached, with the same problem.
Here is the initial SYN - SYN/ACK agreement for the MSS:
6 2.382020 192.168.1.11 212.58.244.70 TCP 66 50783 → 443 [SYN] Seq=0 Win=65535 Len=0 MSS=1460 WS=8 SACK_PERM=1
54 2.420046 212.58.244.70 192.168.1.11 TCP 58 443 → 50783 [SYN, ACK] Seq=0 Ack=1 Win=0 Len=0 MSS=1410
This shows in the SYN/ACK the MSS of 1410, which is fantastic. Exactly as configured. From my understanding this is a one time negotiation and this MSS should be used throughout the rest of the connection communication.
So, why is it that the text appears immediately, but I am having to always wait for the images?
Has anyone seen this before?
Comments
That is a question that would require having all packets for the whole page loading process, including the pictures. The handshake is nice, but to see where the delays are the rest of the packets need to be looked at. Can you share a PCAP?
I can't load a PCAP as I apparently don't have enough points.
Okay, can you put it on a file hoster, or CloudShark, and post the link? Make sure that it's visible to the public (CloudShark makes uploaded PCAPs private by default IIRC)
Try this: https://www.cloudshark.org/captures/b...
ip.addr==212.58.244.70 as the filter for the website address
It requires a login, so I guess it's still set to private ;-)