python - Sniff() function is not filtering packets as mentioned in the option "filter" -


i have python script uses scapy sniff trafic. have line 

sp=input('please enter sourceport number') s="tcp , port "+str(sp) syn=sniff(filter=s, iface="eth0",count=1,timeout=60)

the problem result of includes non tcp packet :

ether / ip / udp / dns qry "daisy.ubuntu.com."

what cause of problem , how can solve it.

thanks in advance.


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