nanog mailing list archives
Re: ISP customer assignments
From: Mark Andrews <marka () isc org>
Date: Thu, 22 Oct 2009 13:38:39 +1100
In message <op.u156b0mztfhldh () rbeam xactional com>, "Ricky Beam" writes:
On Tue, 20 Oct 2009 19:38:58 -0400, Bill Stewart <nonobvious () gmail com> wrote:... If you've got a VPN tunnel device, too often the remote end will want to contact you at some numerical IPv4 address and isn't smart enough to query DNS to get it.As I was told by Cisco, that's a security "feature". Fixed VPN endpoints are supposed to be *fixed* endpoints. Yes, it is a pain when an address changes, for whatever reason. But relying on DNS to eventually get the endpoint(s) right is an even bigger mess... how often is the name<->IP updated?
It should be automatically updated by the end point. We do have the technology to do that.
how often do the various DNS servers revalidate those records?
If you are talking about caching servers then they will honour the TTL in the records.
how often do the VPN devices revalidate the names?
At startup. A well designed VPN protocol will support end point address mobility.
what happens when the dns changes while the vpn is still up?
This should be transparent to everything other than the vpn end points.
I'll stick with entering IP addresses. --Ricky
-- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: marka () isc org
Current thread:
- Re: ISP customer assignments, (continued)
- Re: ISP customer assignments Nathan Ward (Oct 19)
- Re: ISP customer assignments Bill Stewart (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Karl Auer (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Roland Dobbins (Oct 20)
- Re: ISP customer assignments Mark Andrews (Oct 20)
- Re: ISP customer assignments Roland Dobbins (Oct 20)
- Message not available
- Re: ISP customer assignments Tim Chown (Oct 21)
- Re: ISP customer assignments Ricky Beam (Oct 21)
- Re: ISP customer assignments Mark Andrews (Oct 21)
- Re: ISP customer assignments Justin Shore (Oct 13)
- Re: ISP customer assignments Chris Hills (Oct 13)
- Re: ISP customer assignments Michael Dillon (Oct 13)
- Re: ISP customer assignments eric clark (Oct 13)
- Re: ISP customer assignments Adam Armstrong (Oct 13)
- Re: ISP customer assignments Scott Morris (Oct 13)
- Re: ISP customer assignments Ricky Beam (Oct 13)
- Re: ISP customer assignments Mark Andrews (Oct 13)
- RE: ISP customer assignments TJ (Oct 13)
- Re: ISP customer assignments Adrian Chadd (Oct 13)