Hi! Can anybody state what can be the problems if we use ip addresses in our LAN that are in use publicily? We are behind a firewall. Thanks!

Hello, using public ip ranges can result in DNS resolution problems as this address can exist also in the public and is used fomr somebody who paid for it. For the LAN use only the private ip range, that's where they are reserved for.Best regards Meinolf Weber Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

As Meinolf indicated, you may have an issue if you use a public range within your network. Let's say for instance that you used the same range that Bing.com uses and configured a subnet as 65.55.175.x/24. When you try to resolve Bing.com from inside your network, the result is currently 65.55.175.254 (according to my nslookup result). Since your PC is on that subnet, the packet will NOT be sent to the router. Your PC will arp for this IP on the segment and no computer will respond. The process will fail. So, if your network will not be connected to the internet, technically, you can safely use any range. However, I would recommend that you use a range within the private IP space: 10.x.x.x, 172.16.x.x, 192.168.x.x Visit: anITKB.com, an IT Knowledge Base.

OK Thanks a lot.