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WAN ○ ------- <span style="color:red">● LAN ------- ● localhost</span> | WAN ○ ------- <span style="color:red">● LAN ------- ● localhost</span> | ||
* testing on LAN: Is service alive? The different servers between LAN or with the same ip class (ex: 1.2.3.*) may not have the firewall limit. | * testing on LAN (local network, subnet scope): Is service alive? The different servers between LAN or with the same ip class (ex: 1.2.3.*) may not have the firewall limit. | ||
** connect to localhost ex: {{kbd | key= telnet 172.18.0.1 23}} (1) IP start with 172.18... is [http://www.itcom.itd.umich.edu/backbone/umnet/privateIP.html Private IP Network Numbers] (2) where 23 is the port number where the service running | ** connect to localhost ex: {{kbd | key= telnet 172.18.0.1 23}} (1) IP start with 172.18... is [http://www.itcom.itd.umich.edu/backbone/umnet/privateIP.html Private IP Network Numbers] (2) where 23 is the port number where the service running | ||
*** if the local service is web server, you can also try {{kbd | key = <nowiki>lynx http://172.18.0.1</nowiki>}} for {{Linux}} | *** if the local service is web server, you can also try {{kbd | key = <nowiki>lynx http://172.18.0.1</nowiki>}} for {{Linux}} | ||