I can not write normal filter in wireshark filter input

Question

Why I can not write normal filter in wireshark filter input?

you see I write the filter:

ip.src==192.168.2.228

there seems do not work.

Answer 1

The field you are in is looking for a Capture Filter, which uses a different syntax than a display filter. The Capture Filter you are looking for is:

host 192.168.2.228

That will capture only traffic to or from IP address 192.168.2.228.

Once you have packets captured, you can use a Display Filter to further filter them. For a Display Filter, your example syntax is correct.

ip.src==192.168.2.228