best practice to provide access to a network whic uses RFC 1918 private add

[amuthu]

I would like to know what''s the best practice as far as using IP numbers if i want to provide access to our customers who are also using RFC 1918 address on their internal network like me ??? Can i use part of public IP ( Class C) assigned by my ISP by taking the chunk that''s not used as of now (VLSM) with NAT?? I read abt NAT in overlapping RFC 1918 address network , looks cumbersome to implement with the intro of DNS...is this solution widely used??? Are there any other avenue i should be researching ???

[beth-martin]

There are plenty of rfc1918 addresses available for any size network. I wouldn’t mix in your assigned address pool if you can avoid it. It would probably turn out to be an administrative headache. One of the main advantages of private numbering is you can control your public addresses centrally through NAT.