The problem here is that you have 2 UDP headers, and thus 2 UDP source ports to consider. The other one is for GTP-C and I don't really care about it. UDP inside GTP is GTP-U and this is the one I am looking into. Thanks the question is, how to just filter the UDP header inside GTP and disregard the port of UDP header beyond GTP? Thus there are two source ports to be considered while filtered. The problem is there are two UDP headers in the capture. I am trying to filter the traffic by udp port and find out that range filter is not working.įilter 2: (udp.port > 48776) and (udp.port 48776) and (udp.srcport < 48778)
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