我的日志中有很多这些条目：
Sep 22 12:20:23 server0187 kernel: [ 7.267934] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=27738 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:23 server0187 kernel: [ 7.688848] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=27738 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep 22 12:20:24 server0187 kernel: [ 7.992988] [UFW BLOCK] IN=ens3 OUT= MAC=56:00:21:32:65:eb:fe:00:00:32:65:eb:08:99 SRC=113.69.80.129 DST=se.rv.er.ip LEN=40 TOS=0x00 PREC=0x00 TTL=48 ID=63510 PROTO=TCP SPT=27738 DPT=23 WINDOW=31379 RES=0x00 SYN URGP=0
Sep …