Juniper JUNOS SRX NAT – Static ‘One-to-One’
SRX NAT KB ID 0000995 Problem Setting up ‘Static NAT’ is the process of taking one of your ‘spare’ public IP addresses, and permanently mapping that public IP to a private IP address on your network. In the example above I want to give my web sever which has an internal IP address of 192.168.1.10/24, the public IP address of 1.1.1.5/24. So if someone out on the Internet wants to view my website, they can...
Cisco ASA Static (One to One) NAT Translation
KB ID 0000691 Problem Note: This is for Cisco ASA 5500, 5500-x, and Cisco Firepower devices running ASA Code. If you have a spare/available public IP address you can statically map that IP address to one of your network hosts, (i.e. for a mail server, or a web server, that needs public access). This is commonly referred to as a ‘Static NAT’, or a ‘One to One translation’. Where all traffic destined for public...
Cisco ASA – DNS Doctoring
KB ID 0001113 Problem Cisco DNS doctoring is a process that intercepts a DNS response packet as it comes back into the network, and changes the IP address in the response. Why Would you want to do this? Well lets say you have a web server on your network, and its public IP is 111.111.111.111, and on your LAN its internal IP address is 192.168.1.100, its public DNS name, (or URL) is www.yoursite.com. When a user types www.yoursite.com...
BT Business ADSL – Configure a 2Wire Router to Allocate a Static (Public) IP Address
KB ID 0000760 Problem I know BT are now shipping the BT Business Hub, to their business ADSL clients, but there’s still a few 2Wire routers out there in the wild. Essentially if you have a range of public IP addresses, this is how to allocate one of the public IP addresses to one of your devices. In my case its a Cisco ASA firewall that I need to have a public IP. Solution Firstly I’m going to assume the router is working and...
Cisco Router – Configure NAT (NAT Overload)
KB ID 0000971 Problem NAT is the process of taking one or more IP adresses and tranlsating it/them into differnet IP addreses. You may require your router to translate all your internal IP addresses to your public (ISP allocated) IP address. To do that we use a process called NAT Overload. Solution 1. Connect to the router, and got to enable mode, then global configuration mode. PetesRouter#configure terminal Enter configuration...