Help abt TOMCAT [LAN-INTERNET]

i have installed tomcat on a system(SYS123) on the LAN....with ip address: 192.168.1.100
this is connected to internet through a wireless router.
lets say my router has the ip address 11.11.11.11 that all my systems on the LAN share for internet.
now how do i access the page hosted on SYS123 from outside the lan, i mean from the internet.
how should i specify the url to reach the webpages hosted by the SYS123 server.
any idea would be appreciated.

This idea is fine but... in environments where i do not have permissions to do port forwarding on the router.. how do i connect to port 8080 on SYS123 from outside the LAN. i mean.....how do i access index.html on SYS123 8080->tomcat listens to 8080 on SYS123

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