I got asked by a customer about handing out random UDP ports through a Cisco 831 router running DHCP and NAT. Apparently this is common in the gaming world. It is not something I have seen before. Can the customer do this with an 831? Apparently, it also works on the 67X series of DSL routers.
Is he providing a gaming server, or he want to allow game traffic in/out of his network ??
You can use NAT or PAT to achieve a translation to a public address.