Port forwarding section is what you're looking for, i'll try to explain it briefly
Step 1. Find out the Internal Ip Address of the Computer you are using..while in mIrc type
/localinfo -h (then look in status screen) after you find that info, be sure to type
/localinfo -u to revert your IP back to what mIRC expects it to be.
now lets assume it told you the Internal IP was 192.168.1.100
Note the IP Address, (you need this to configure the Router), in our case 192.168.1.100 (Yours may Differ)
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Step 2. Open up your Router Configuration and forward ports to the IP Address you just got when doing step 1......In this case we will forward ports 4000 up to 4004 to your IP Address 192.168.1.100 (Yours may Differ) .. Thats a total of 5 ports for DCC...(Should you want more ports..its 1 port per dcc). Then in your routers Port forwarding section forward these 5 ports to your Internal IP...After making changes to your router configuration click Apply or Save or whatever option it gives you to save changes and exit.
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Step 3. Go back to mirc Options (normally accessible by holding down the ALT-key and hitting the letter O (Alt + O) ...then look for Connect > Options [Advanced] button..and look where it says DCC Ports First Last (The default options here are First 1024 Last 5000) we change these to First 4000 and Last 4004 (This tells mirc to use only ports 4000 to 4004 for DCC) ... The above assumes you are using a recent version of mIRC
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Thats it, you just configured your router and mirc to use ports 4000 to 4004, for DCC ..easy huh.?
