防火墙映射服务器22端口，从公网访问异常

组网：防火墙将服务器22端口映射到公网的1005端口，利用公网IP加端口（1055）的方法（ssh）远程访问服务器22端口，流量进入防火墙，下联交换机，交换机直连服务器。

异常情况：从公网远程防火墙映射的1005端口时，出现频繁远程失败的原因，访问6次，有三次远程失败。防火墙上有开启dbg有看到远程信息经过服务器。

*Aug 15 09:05:16:368 2024 SJWFW_toDZZWWW IPFW/7/IPFW_PACKET: -COntext=1;

Receiving, interface = Ten-GigabitEthernet1/2/2

version = 4, headlen = 20, tos = 0

pktlen = 52, pktid = 42187, offset = 0, ttl = 126, protocol = 6

checksum = 26569, s = 172.24.133.253, d = 10.24.180.1

channelID = 0, vpn-InstanceIn = 0, vpn-InstanceOut = 0.

prompt: Receiving IP packet from interface Ten-GigabitEthernet1/2/2.

Payload: TCP

  source port = 58255, destination port = 1005

  sequence num = 0xf64c5989, acknowledgement num = 0x00000000, flags = 0x2

  window size = 64240, checksum = 0x4c9d, header length = 32.

*Aug 15 09:05:16:368 2024 SJWFW_toDZZWWW IPFW/7/IPFW_PACKET: -COntext=1;

Sending, interface = Ten-GigabitEthernet1/2/1

version = 4, headlen = 20, tos = 0

pktlen = 52, pktid = 42187, offset = 0, ttl = 125, protocol = 6

checksum = 46144, s = 172.24.133.253, d = 10.129.104.33

channelID = 0, vpn-InstanceIn = 0, vpn-InstanceOut = 0.

prompt: Sending IP packet received from interface Ten-GigabitEthernet1/2/2 at interface Ten-GigabitEthernet1/2/1.

Payload: TCP

  source port = 58255, destination port = 22

  sequence num = 0xf64c5989, acknowledgement num = 0x00000000, flags = 0x2

  window size = 64240, checksum = 0x9beb, header length = 32.