networking - TCP/IP Socket Programming Static Web IP between Dynamic IP -


i confused tcp/ip socket programming. know internet protocols in theory...

i explaining problem (what need )

i have server working on x.x.x.x ip adress. , listens y port.

when want connect server on pc, have no problem because wrote ip adress (x.x.x.x) , port (y) , pc connects..

when connect server server keeps ip adress , local ip adress.. after connection end.

here problem starting... sad server knows local pc informations. how can connect local pc on server web server , sent tcp or udp packets ? did port forwarding on modem dont want it. when did port forwarding there no problem dont want ...

thanks replies , sorry engislih if have mistakes .

if router/nat sits between server , outside client, must use port forwarding on router. outside client not connecting server's private lan ip/port directly, connecting router's public wan ip/port instead. router needs know forward inbound packets ip/port server's private lan ip/port.

a client running on local pc able connect server because both on same lan side of router, connection direct , not go through router's wan. not case clients on wan side of router.


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