![]() ![]() ![]() The signs are used to add multiple filter port where packages will be listed where one of the port number match. You can manually account for variable IP header lengths or you can make life easy and test for specific offsets (counting from 0 from the start of the outer IP header) by using: ip=0x13c4 or ip[:2=0x13c4Ĭould you upload a small example capture file on and post the link here, then we can assist you in building a proper capture filter. udp.port 53 Wireshark UDP Port Filter Filter Multiple Ports Wireshark also supports multi-port filtering where multiple ports can be specified to math with an OR logic. I don't think there is a similar keyword for IP-in-IP. This also happens when there is vlan tagging, but for vlan tagging, you can add the word "vlan" to your filter to make it correct the offsets. When I do this for "udp port 5060", I get: (000) ldh Īs BPF is not aware of IP-in-IP encapsulation, it will check for the value of 5060 (0x13c4) in the wrong place. There are some cases where this would fail like when the OS reallocates a port to a different app just before Wireshark queries the OS for PID for a port. With code changes, it should be possible for Wireshark to map port to PID. You can see the way the filter works by using "tcpdump -d ". Wireshark knows which port is being used and the OS knows the PID of the process that is using the port. BPF (the engine responsible for filtering) uses fixed offsets to look for things. Run RawCap on command prompt and select the Loopback Pseudo-Interface (127.0.0.1) then just write the name of the packet capture file (. ![]() Yes, the IP-in-IP encapsulation is messing up your capture filter. For Windows, You cannot capture packets for Local Loopback in Wireshark however, you can use a very tiny but useful program called RawCap RawCap. ![]()
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