Want to host 2 servers on same machine

[sieze]

Ok

to start i am hosting a live server it is joinable no problems its running a deathrun server for my friend ({TMG} deathrun) coded himself. im onyly hosting it becouse he himself is already hosting his mirrors edge gamemode (and yes its epic) but the main problem i have is i want to host my own server BUT my IP that is on the DMZ is in use by the server im already hosting and as far as i know the only UDP that SRCDS works with is port 27015 so if i launch another srcds my ip is already using port 27015 and sets the port of the new server to 27016 witch is not a valid SRCDS port i was wandering how i can go about changing the ip's of the servers.

Game: Garrysmod
OS Name Microsoft Windows 7 Ultimate
Version 6.1.7600 Build 7600
OS Manufacturer Microsoft Corporation
System Manufacturer Gigabyte Technology Co., Ltd.
System Model 965GM-S2
System Type X86-based PC
Processor Intel® Core™2 CPU 6300 @ 1.86GHz, 1867 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. F7, 5/28/2007
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume1
Installed Physical Memory (RAM) Not Available
Total Physical Memory 2.00 GB
Total Virtual Memory 4.00 GB
Available Virtual Memory 2.11 GB
(i know a very detailed PC spec list)

[Glazz]

Why do you tell 27016 is not a valid port? I try that port myself and worked.. and my friends could join the server too..

[Beaverbeliever]

You can set the port for the 2nd SRCDS to be on 27016. Just add the -port 27016 argument on the startup command line.

[sieze]

when i do no one can join i have all ports opened that are required