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sudo tcpdump -i any tcp port 9501

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13:29:07.788802 IP localhost.42333 > localhost.9501: Flags [S], seq 828582357, win 43690, options [mss 65495,sackOK,TS val 2207513 ecr 0,nop,wscale 7], length 0
13:29:07.788815 IP localhost.9501 > localhost.42333: Flags [S.], seq 1242884615, ack 828582358, win 43690, options [mss 65495,sackOK,TS val 2207513 ecr 2207513,nop,wscale 7], length 0
13:29:07.788830 IP localhost.42333 > localhost.9501: Flags [.], ack 1, win 342, options [nop,nop,TS val 2207513 ecr 2207513], length 0
13:29:10.298686 IP localhost.42333 > localhost.9501: Flags [P.], seq 1:5, ack 1, win 342, options [nop,nop,TS val 2208141 ecr 2207513], length 4
13:29:10.298708 IP localhost.9501 > localhost.42333: Flags [.], ack 5, win 342, options [nop,nop,TS val 2208141 ecr 2208141], length 0
13:29:10.298795 IP localhost.9501 > localhost.42333: Flags [P.], seq 1:13, ack 5, win 342, options [nop,nop,TS val 2208141 ecr 2208141], length 12
13:29:10.298803 IP localhost.42333 > localhost.9501: Flags [.], ack 13, win 342, options [nop,nop,TS val 2208141 ecr 2208141], length 0
13:29:11.563361 IP localhost.42333 > localhost.9501: Flags [F.], seq 5, ack 13, win 342, options [nop,nop,TS val 2208457 ecr 2208141], length 0
13:29:11.563450 IP localhost.9501 > localhost.42333: Flags [F.], seq 13, ack 6, win 342, options [nop,nop,TS val 2208457 ecr 2208457], length 0
13:29:11.563473 IP localhost.42333 > localhost.9501: Flags [.], ack 14, win 342, options [nop,nop,TS val 2208457 ecr 2208457], length 0