We have a network setup so that we have a feed coming in from the Internet to our router and the LAN behind our router consists of some webservers configured with a subnet of public IP addresses, our provider is routing packets to this network to our router and then our router routes them to the correct server on the LAN, this works fine.
The issue is that we now need some more IP addresses (for SSL hosted sites on the webservers) and the new block we will get most likely won't continue on from the block we already have. What I'm trying to do is work out how to setup our router so that the LAN has 2 (or more) networks configured so that the servers can listen on both blocks of addresses.
The router we have is a Cisco 861 and in the web inteface you can simply set a WAN IP and mask and a LAN (or rather VLan) IP and mask, this worried me that it wouldn't be possible but after connecting using SSH and checking out some of the CISCO commands I'm starting to think this may be possible with this router?
What I am currently thinking is I simply need to create a new VLAN for each block of IPs we need, is this correct? If so then I've been looking at this but it appears at that a VLAN is attached to a particular interface (or interfaces), there are 4 physical LAN ports on this router and it seems a bit wrong that I would have to connect a seperate cable to each port with a VLAN on it all going into the same router so they can get to the webserver.
So I guess my question is can I a) have multiple IP addresses/subnets on a single VLAN or b) can I set up multiple VLANs and attach them to a single phyical interface?
Thanks for taking the time to read this and I hope my questions is clear enough and makes sense.