I currently have a WAN link setup consisting of a 1721 router with 1 x WIC1-ADSL and 1 x FastEthernet Int (with static public IP) that is connected to a 1841 router that is configured to establish VPN tunnels to the WAN and provide DHCP to the LAN.
Internet -- 1721 -- 1841 -- LAN
The problem we have is that this site now requires an additional ADSL link for the Fire & Intruder Alarm and rather than take out another broadband line for this function we would like to utilise the existing one if possible.
Can someone please give me some advise as to whether I could add another interface to the 1721 router and use this for the alarm, bearing in mind that i must also assign this new interface a public ip too?
Can this be done using a single WIC1ADSL and if so please could you explain how?
Many many thanks