How to use a IP block on cisco 877
Posted on 2016-11-04
HI all, More newbie questions!
I have an adsl service with a single static IP terminated on a Cisco 877.
I need to have multiple services on 443 and I thought the best way to separate them was to order another static ip from my telco which I did. I was expecting just to get another single ip address which I could add as a secondary address on my router however its more complex than that
My Config (Ip's changed to protect the innocent!)
My current static ip is 220.127.116.11
I ordered two additional IPs and I received a block. with the following details
So my usable IP's should be 18.104.22.168, 22.214.171.124
I don't seem to be able to add these as secondary IP's and my telco couldn't answer questions about what a default gateway would be for those addresses so I new I maybe was on the wrong track
I have found other people on a forum with similar tales from the same isp and the solution seemed to be that you don't assign these ip's to interfaces, rather you just create static maps to inside devices. I'm not sure how the magic works in terms of routing but anyhow I gave it a go and added the following nat statement to my 877
ip nat inside source static 192.168.100.1 126.96.36.199
Am I going about this wrong? or is there something my ISP still needs to do?