Public IP impassability outside the network connection-CodePudding

I adsl, have public IP, trying, there is a small server network SSH connection is no problem, but whether do port mapping or set DMZ zone, outside the network cannot SSH to the server, to prevent shielding port operators, I put the SSH port is set to a value, but still invalid, caught package also found that the server received a package, I wonder, stick the log out for everybody to help to analyze,
15:27:01. 222418 IP 114.242.248.100.53793 & gt; 192.168.1.120.36000: Flags [S], seq 2149074970, Windows 65535, the options (1440 MSS, nop, wscale 4, nop, nop, TS 251514818 ecr 0, val sackOK, eol], length 0
15:27:01. 222570 IP 192.168.1.120.36000 & gt; 114.242.248.100.53793: Flags [S], seq 4092207423, ack, 2149074971, 14480, win the options [MSS 1460, sackOK, TS val 564185 ecr 251514818, nop, wscale 7], length 0
15:27:01. 595176 IP 114.242.248.100.53793 & gt; 192.168.1.120.36000: Flags [S], seq 2149074970, Windows 65535, the options (1460 MSS, nop, wscale 4, nop, nop, TS 251515895 ecr 0, val sackOK, eol], length 0
15:27:01. 595302 IP 192.168.1.120.36000 & gt; 114.242.248.100.53793: Flags [S], seq 4092207423, ack, 2149074971, 14480, win the options [MSS 1460, sackOK, TS val 564223 ecr 251514818, nop, wscale 7], length 0
15:27:02. 413803 IP 192.168.1.120.36000 & gt; 114.242.248.100.53793: Flags [S], seq 4092207423, ack, 2149074971, 14480, win the options [MSS 1460, sackOK, TS val 564305 ecr 251514818, nop, wscale 7], length 0
15:27:02. 623005 IP 114.242.248.100.53793 & gt; 192.168.1.120.36000: Flags [S], seq 2149074970, Windows 65535, the options (1460 MSS, nop, wscale 4, nop, nop, TS 251516902 ecr 0, val sackOK, eol], length 0
15:27:02. 623134 IP 192.168.1.120.36000 & gt; 114.242.248.100.53793: Flags [S], seq 4092207423, ack, 2149074971, 14480, win the options [MSS 1460, sackOK, TS val 564325 ecr 251514818, nop, wscale 7], length 0
15:27:03. 648781 IP 114.242.248.100.53793 & gt; 192.168.1.120.36000: Flags [S], seq 2149074970, Windows 65535, the options (1460 MSS, nop, wscale 4, nop, nop, TS 251517909 ecr 0, val sackOK, eol], length 0