Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 - how to proceed?
Thomas Narten <narten@us.ibm.com> Thu, 22 October 2009 18:14 UTC
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Comments: In-reply-to Thomas Huth <THUTH@de.ibm.com> message dated "Thu, 22 Oct 2009 09:33:28 +0200."
Date: Thu, 22 Oct 2009 14:14:29 -0400
From: Thomas Narten <narten@us.ibm.com>
Subject: Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 - how to proceed?
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I am opposed to relying on DNS round robin as the default/best/recommended approach to do load balancing when booting. Round Robin DNS load balancing is not officially supported in the IETF because the only way you can get it to work properly is to disable DNS caching (i.e, use TTLs of 0) so that a query always goes back to a server than can explicitely modify the ordering. But disabling caching has negative implications for DNS performance, reliability, etc. You then also have to have specially modified servers (that reorder results based on various criteria) that are again not officially blessed by the IETF. The IETF DNS WGs have discussed this many many times, and have so far not been willing to bless such load balancing. I do know that it is used in some environments and can be a useful tool at times. If it is a requirement that remote booting include support for load balancing, I think we need to first make note of that and develop a proper solution. There are number that could work that are fairly simple (e.g., consider the DNS SRV "weight" mechanism). That said, it is not clear to me that load balancing is actually a requirement that needs solving. At least not for preboot loading. Comments? Thomas
- [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt-net… Damien Neil
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Huth
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Narten
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Ted Lemon
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Narten
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Ted Lemon
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Narten
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Damien Neil
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Ted Lemon
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Stephen Jacob
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Alfred Hönes
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Ted Lemon
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Huth
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Bud Millwood
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Huth
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Jarrod Johnson
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Jarrod Johnson
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Jarrod Johnson
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Jarrod Johnson
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Bud Millwood
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Jarrod Johnson
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Huth
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Jarrod Johnson
- Re: [dhcwg] Comments on draft-ietf-dhc-dhcpv6-opt… Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Niall.oReilly+lists
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Chuck Anderson
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … H. Peter Anvin
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Niall.oReilly+lists
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Narten
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … jarrod.b.johnson@gmail.com
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Woundy, Richard
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Narten
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Woundy, Richard
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Thomas Narten
- Re: [dhcwg] netboot load balancing (was: draft-ie… Thomas Huth
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … Ted Lemon
- Re: [dhcwg] draft-ietf-dhc-dhcpv6-opt-netboot-05 … H. Peter Anvin