Security Basicsmailing list archives
RE: IP announce DOS
From: "David Gillett" <gillettdavid () fhda edu>
Date: Fri, 10 Jun 2005 10:42:21 -0700
It most definitely is not possible to transfer IP ranges between ISP.
Ahem. If you have done the necessary dance to get an AS number, you have your own block of addresses associated with it. You then arrange with your ISP(s!) to "announce" your block as being reachable through them. If the rest of your message were correct, it would be impossible to achieve routing redundancy by advertising your corporate server addressesvia multiple ISPs. (And it's NOT impossible; I've done it three times so far for different organizations.) While an ISP announces summarized routes to keep the core tables small,there's no requirement that it (or any other AS) summarize down to a *single* address block. A browse through a whois database will findseveral major ISPs (and other large enterprises) who have multiplenon-contiguous address blocks assigned to them.David Gillett
Current thread:
- IP announce DOSAlex Thurlow (Jun 09)
- Re: IP announce DOSMicheal Espinola Jr (Jun 09)
- RE: IP announce DOSBurton Strauss (Jun 10)
- RE: IP announce DOSDavid Gillett (Jun 09)
- RE: IP announce DOSThomas Ng (Jun 10)
- RE: IP announce DOSBurton Strauss (Jun 10)
- <Possible follow-ups>
- RE: IP announce DOSAndrew Shore (Jun 10)
- RE: IP announce DOSDavid Gillett (Jun 13)
- Re: IP announce DOSAlex Thurlow (Jun 10)
- Re: Re: IP announce DOScrabdog (Jun 13)
- Re: IP announce DOSMicheal Espinola Jr (Jun 09)