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i am in linux environment ,when i run command below

[test@pekphispre03021 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?

i am in linux environment ,when i run command below

[test@pekphispre03021 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?

i am in linux environment ,when i run command below

[test@pekphispre03021 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:
........