Is it possible to perform NAT on reserved IPs

[kujur.sanju]

NAT(Network address Translation) mainly used for private IPs for translation. But can we perform NAT on Reserved IPs. If yes (please provide the reason), If No (then why)?

Thanks in advance.

Sanjeev kujur

[Karsten Iwen]

What do you mean with reserved addresses? In general, a NAT implementation should not care what addresses it translates. You can translate any address in any other address.

• Most typical is private -> public
• In extranet quite common: private -> other private
• comapnies that use "foreign" public IP space internally: public -> public
• CGN: reserved space -> public
• Documentation/Labs: reserved -> other reserved

[kujur.sanju]

reserved addresses (IP address from 169.254.0.0 to 169.254.255.255) 

[Karsten Iwen]

Should be possible but never be done. By definition these APIPA-addresses are not for communication out of the local network.

[devils_advocate]

Can you explain why you are using these addresses?

[ashok_boin]

Technically, this can be done. However, please note that these are reserved mainly for DHCP clients with auto config even if server is not found/reachable.

A caution: Assume your private network is in 169.254.x.x and so are your clients, any new Microsoft client (unauthorized) can communicate with your clients as the new client also assigns itself the IP address from same range (169.254.x.x).

http://www.tcpipguide.com/free/t_DHCPAutoconfigurationAutomaticPrivateIPAddressingA.htm

Regards..

Ashok.