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Unknown protocol -- "pn_rt"

i am in linux environment ,when i run command below

[[email protected] test]$ tshark -r test.pcapng -d ethertype==0x8892,pn_rt -T fields -e _ws.col.Source -e _ws.col.Destination -e _ws.col.Protocol -E header=n -E separator=, -E occurrence=f tshark: Unknown protocol -- "pn_rt" tshark: Valid protocols for layer type "ethertype" are: ....

how to resolve this problem?

Unknown protocol -- "pn_rt"

i am in linux environment ,when i run command below

[[email protected] test]$ tshark -r test.pcapng -d ethertype==0x8892,pn_rt -T fields -e _ws.col.Source -e _ws.col.Destination -e _ws.col.Protocol -E header=n -E separator=, -E occurrence=f occurrence=f

tshark: Unknown protocol -- "pn_rt" "pn_rt"

tshark: Valid protocols for layer type "ethertype" are: ....

how to resolve this problem?

Unknown protocol -- "pn_rt"

i am in linux environment ,when i run command below

[[email protected] test]$ tshark -r test.pcapng -d ethertype==0x8892,pn_rt -T fields -e _ws.col.Source -e _ws.col.Destination -e _ws.col.Protocol -E header=n -E separator=, -E occurrence=f

occurrence=f

tshark: Unknown protocol -- "pn_rt"

"pn_rt"

tshark: Valid protocols for layer type "ethertype" are: ....

....

how to resolve this problem?