cancel
Showing results for 
Search instead for 
Did you mean: 

traffic queue - Differentiated Services Field 82?

Community Veteran
Posts: 3,187
Thanks: 20
Fixes: 2
Registered: 31-07-2007

traffic queue - Differentiated Services Field 82?

http://community.plus.net/library/faults/using-wireshark-for-data-capture/#queues ; what is an 82?
e.g. Differentiated Services Field: 0x82 (DSCP 0x20: Class Selector 4; ECN: 0x02)
I have been having problems with using http://gateway.playneverwinter.com/ today. I had assumed it was down to the packet loss I am getting after my connection was reset today and also on too low a SNR of 3 for my connection.
But I fired up wireshark just now and I was getting 82's during periods of the site being very slow, which then reverted to 80's once it cleared.  So is this a new traffic queue or a glitch somewhere?
Unvalued customer since 2001 funding cheap internet for others / DSL/Fibre house move 24 month regrade from 8th May 2017
3 REPLIES
Plusnet Staff
Plusnet Staff
Posts: 12,169
Thanks: 18
Fixes: 1
Registered: 04-04-2007

Re: traffic queue - Differentiated Services Field 82?

Hi Gus,
We don't use 82 anywhere, only the ones listed on the page you linked. If the site (or a router between the site and us) sets the DSCP value before it gets to us then we'll rewrite it. However, once it leaves our network it can get rewritten again, I've seen this with some routers if the traffic is going through an ALG in the router. SIP is a common one for doing this so it could be that the router is rewriting it for some reason. Is it just HTTP or another protocol?
Community Veteran
Posts: 3,187
Thanks: 20
Fixes: 2
Registered: 31-07-2007

Re: traffic queue - Differentiated Services Field 82?

and whoosh as that went over my head, I have got to admit I am a self taught techie and that is beyond me.  But this is the first time I has seen the 82 in any capture I have taken and it was a HTTP and TCP.
I kept the capture so will upload it to my web space and pm you a link
Unvalued customer since 2001 funding cheap internet for others / DSL/Fibre house move 24 month regrade from 8th May 2017
Community Veteran
Posts: 5,093
Thanks: 454
Fixes: 17
Registered: 10-06-2010

Re: traffic queue - Differentiated Services Field 82?

If you click the + by Differentiated Services Field wireshark is sort of explaining it. Part of the 0x82 value is used for the class selector and the other part of the the 0x82 value is used for ECN (Explicit Congestion Notification).