[AusNOG] Telstra NBN - DSCP Filtering

[Dino Sosic]

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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