Security Basics mailing list archives
Re: Private IP Address from Exchange
From: "Jason Ross" <algorythm () gmail com>
Date: Thu, 31 May 2007 23:39:17 -0400
On 5/30/07, Danux <danuxx () gmail com> wrote:
When i send a message from my local area to yahoo, the local ip address of my local mail box server is shown in Internet, i would like to know if there is a way to hide the local ip address. How could i hide the local ip address??????
<snip>
Microsoft says "it is the way the protocol works!!!", following the related RFC.
I'm not an Exchange expert by any means, so can't really answer the "how to" part of the question you're asking, but I wanted to throw my 2bits in the bucket by saying that, in this case, Microsoft is correct, and having the mail server's real IP in the headers is the "correct" behaviour. A relevant snippet from RFC 3821 is section 3.8.1: When forwarding a message into or out of the Internet environment, a gateway MUST prepend a Received: line, but it MUST NOT alter in any way a Received: line that is already in the header. <snip> However, the most important use of Received: lines is for debugging mail faults, and this debugging can be severely hampered by well-meaning gateways that try to "fix" a Received: line. While this particular example from the RFC doesn't specifically state that the IP must be accurate, it does indicate *why* doing so is desired. See also section 4.4 of the same RFC. -- jason
Current thread:
- Re: Private IP Address from Exchange Jason Ross (Jun 01)
- <Possible follow-ups>
- RE: Private IP Address from Exchange Mike Alexander (Jun 01)
- Re: Private IP Address from Exchange Danux (Jun 01)
- Re: Private IP Address from Exchange TheGesus (Jun 01)
- Re: Private IP Address from Exchange Buz Dale (Jun 01)
- Re: Private IP Address from Exchange Kurt Buff (Jun 01)