set a filter of packet length in wireshark

问题:

I've capture a pcap file and display it on wireshark. I want to analysis those udp packets with 'Length' column equals to 443.

On wireshark, I try to found what's the proper filter.

udp && length 443 # invalid usage
udp && eth.len == 443 # wrong result
udp && ip.len == 443 # wrong result

By the way, could the wireshark's filter directly apply on libpcap's filter?

回答1:

All these workable on wireshark's filter

frame.len==243  <- I use this
ip.len=229
udp.length==209
data.len=201