A 3rd party has asked me to open a range of ports for a new phone system they are installing. However, I can't figure out how to open a range of ports on my Cisco 1921. They are asking me to open ports 10000 to 20000 I have done this for port 5060 but that is just one port.
We only have 1 WAN interface (Dialer 1) and the NAT only needs to go to 1 device 192.168.20.240 does anybody have any ideas on how to do this? I have had a look and can see some people have had mixed results with route maps or they have just ented a thousand lines of NAT.
As I said NATing port 5060 was simple as per below
ip nat inside source static udp 192.168.20.240 5060 interface Dialer1 5060
Thanks