I believe Register.com (or any for that matter) has the right to use internal address space where ever they want. The fact that internal address space is showing in a traceroute between you and them might mean a wide range of things. In this case, Register.com 'might' be using internal address space on some(all) of their WAN links. You <-> Internet <-> Company A Router <-> WAN Link (internal IP space) <-> Company A Router <-> Web Servers Whether or not people should used RFC reserved IP space for WAN links is not a discussion I wish to have. Chris Kleban -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu]On Behalf Of Los, Ralph Sent: Wednesday, September 05, 2001 4:13 PM To: 'nanog@merit.edu' Subject: Register.com .....routing issue? Sensitivity: Confidential Hey folks, Has anyone tried to trace to Register.com's main page yet? I haven't been able to hit it, and when I try to trace down to them I end up hitting a 10.0.30.x network, then go back to public IP's...how is that possible? Anyone else having trouble connecting to them? Happy Monday! (still) Ralph M. Los Asst. Vice-President, Internet Systems and Security EnvestNetPMC rlos@envestnet.com (312) 827-3945 (direct) (312) 296-9003 (wireless w/voicemail) * If you haven't been hacked, you don't know where your vulnerabilities lie*

Oh Gawd. Not this again! That is because someone who doesn't care about PMTU working end-to-end has used RFC1918 addresses on WAN links inside their network. --- John Fraizer EnterZone, Inc On Wed, 5 Sep 2001, Los, Ralph wrote:

Hey folks,

Has anyone tried to trace to Register.com's main page yet? I haven't been able to hit it, and when I try to trace down to them I end up hitting a 10.0.30.x network, then go back to public IP's...how is that possible?

Anyone else having trouble connecting to them?

Happy Monday! (still)

Ralph M. Los Asst. Vice-President, Internet Systems and Security EnvestNetPMC rlos@envestnet.com (312) 827-3945 (direct) (312) 296-9003 (wireless w/voicemail) * If you haven't been hacked, you don't know where your vulnerabilities lie*

On Wed, 5 Sep 2001, Los, Ralph wrote:

Has anyone tried to trace to Register.com's main page yet? I haven't been able to hit it, and when I try to trace down to them I end up hitting a 10.0.30.x network, then go back to public IP's...how is that possible?

RFC 1918 space is very commonly used (although it should be almost universal by now) between the public internet and the final destination [also public] space. Simple resource conservation. As for "How", remember that private space is no different from public space, except for the "gentlemans agreement" we all have not to route it externally. For use as transit networks, private space _almost always_ a Good Idea. -- Yours, J.A. Terranson sysadmin@mfn.org If Governments really want us to behave like civilized human beings, they should give serious consideration towards setting a better example: Ruling by force, rather than consensus; the unrestrained application of unjust laws (which the victim-populations were never allowed input on in the first place); the State policy of justice only for the rich and elected; the intentional abuse and occassionally destruction of entire populations merely to distract an already apathetic and numb electorate... This type of demogoguery must surely wipe out the fascist United States as surely as it wiped out the fascist Union of Soviet Socialist Republics. The views expressed here are mine, and NOT those of my employers, associates, or others. Besides, if it *were* the opinion of all of those people, I doubt there would be a problem to bitch about in the first place... --------------------------------------------------------------------