[AusNOG] Telstra NBN - DSCP Filtering

[Brad Gould]

Depending on the NBN wholesale product that is used for the retail product, DSCP is important.

http://www.nbnco.com.au/content/dam/nbnco2/documents/sfaa-wba2-product-catalogue-nebs-product-tech-spec_20150630.pdf

>From memory, DSCP marked traffic thats non-compliant to the product spec is dropped at the NNI (towards customer).

Brad



From: AusNOG [mailto:ausnog-bounces at lists.ausnog.net] On Behalf Of Joseph Goldman
Sent: Friday, 7 August 2015 13:38
To: ausnog at lists.ausnog.net
Subject: Re: [AusNOG] Telstra NBN - DSCP Filtering

Have heard the same, and it is common knowledge on Whirlpool forums when people have this problem, DSCP is the first culprit.

I have only seen the complaint about Telstra/Bigpond services myself, so yes I do believe it may be them implementing it.
On 07/08/15 14:02, Dino Sosic wrote:
Hi guys,

Something I discovered after an extensive tshooting. Telstra service on NBN ( TID Service ) actually drops all non 0 marked DSCP markings. They say it's actually NBN doing that, but I do not see this on other providers. I had phones trying to register across the IPsec through that NBN, that were failing to do so as long as they were sending marked packets (phones mark it EF by default ). Once I remarked the voice traffic to DSCP 0(default), the SIP registered immediately. Some heavy traffic manipulation or what? :) So much for unhindered transport from A to B.
Interesting part was also, even though the voice traffic is inside the ESP packet, those packets get dropped, I am guessing due to size+DSCP marking copied to ESP packet. Anyone seen this before?

Dino
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