topic Re: Cache Engine with a private address in Application Networking

Cache Engine with a private address

m.abdallah — Tue, 29 Oct 2002 11:40:45 GMT

Can I configure my CE590 with a private address ( for ex. 172.16.1.1 )

Should I translate this private address to a public address ?

The sample configuration in the below URL comment :

!---Important: If you configure the Cache Engine

!---with a private address, it must get!---translated to a public address. "

http://www.cisco.com/warp/customer/117/cache_engine/transparentconfig.htm

please advise me

Thanks

Mohamed Abdallah

Re: Cache Engine with a private address

pknoops — Tue, 29 Oct 2002 12:24:56 GMT

Mohamed,

They key with this whole concept is simply that many external websites on the net will perform dns reverse lookups and that will be on the cache engine's ip address. If it is private, then it certainly must be natted somewhere in your network to a public ip address that resolves correctly on the internet. You would need to configure a PTR record in your dns for the cache engines ip address for this reverse lookup senario.

Regards

Pete Knoops

Cisco Systems

Re: Cache Engine with a private address

m.abdallah — Tue, 29 Oct 2002 21:18:17 GMT

Pete,

Thanks for your help

Could you explain in more details ?

Should I configure a static NAT on the router for the CE ip address

OR use the PTR record in my DNS for the CE ip add. for the DNS reverse lookup ??

What if I give the CE a public IP address ? Do I need PTR record in my DNS for the CE ip address?

Regards

Mohamed Abdallah

Re: Cache Engine with a private address

pknoops — Wed, 30 Oct 2002 13:08:37 GMT

Should I configure a static NAT on the router for the CE ip address

OR use the PTR record in my DNS for the CE ip add. for the DNS reverse lookup ??

Answer: In any event, you will need a PTR record configured in your DNS network for the CE ip address. This must be a public record so that the internet sites can do a reverse lookup. Best case senario for security is to configure static nat on the router with a public ip address that resolves to the internal private ip address of the CE

What if I give the CE a public IP address ? Do I need PTR record in my DNS for the CE ip address?

Answer: You can certainly do that and it does make things a bit easier. For security though, I recommend going with the private ip with nat upstream.

Regards

Pete..