We have a Draytek Vigor 2820 in our office and we have a few servers running websites and email applications. These servers each have their own public ip using WAN aliases that are mapped to their local IP.
I am looking to extend our IP block (from our ISP) from 5 static IP addresses to 15. The problem is, I can't find a medium business type router that supports more than 8 WAN aliases.
Is there an alternative way of routing public IP addresses to local servers that bypasses the 8 alias limit. Or do we need a much more expensive router? Our current router cost about £200. The top Draytek router I found with the same limitation is around £500.