向防火墙接口的18264/tcp端口发送报文。TTL设置得很低,因此无法转发报文:
14:56:25.169480 IP (tos 0xe0, ttl 255, id 21407, offset 0, flags [none], proto: ICMP (1), length: 68) 193.0.0.1 > 194.0.0.1: ICMP time exceeded in-transit, length 48
IP (tos 0x0, ttl 1, id 5120, offset 0, flags [none], proto: TCP (6), length: 40) 194.0.0.1.9003 > 10.0.0.99.18264: S, cksum 0x03e6 (correct), 2834356043:2834356043(0) win 512
封装IP报文的目标地址为防火墙管理服务器的地址。
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