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Downlink GTP-U packet with extension dropped in ASTF mode #1158

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hoannd opened this issue Jan 6, 2025 · 0 comments

hoannd commented Jan 6, 2025

I am using T-Rex to simulate HTTP traffic in ASTF mode to test our UPF. I setup Trex as the topo like this:

Client (gNodeB - Trex - port 1, server 1) <---- N3 (GTP-U) ----> UPF (server 2) <---- N6 ----> server (DN - Trex - port 2, server 1)

On uplink, GTP-U packet generated by Trex does not contain extension.

TRex dropped downlink GTP-U packet with extension encapsulated by UPF. So client and DN cannot setup TCP connection.

If UPF does not encapsulate extension in downlink GTP-U packet, Trex client and server send and receive HTTP traffic.

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