perfsonar-user - Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records
Subject: perfSONAR User Q&A and Other Discussion
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- From: Eli Dart <>
- To: Brian Candler <>
- Cc: "" <>
- Subject: Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records
- Date: Thu, 5 May 2016 10:38:53 -0700
Hi Brian,
In general, if there is an A record and a AAAA record for the same name, host stacks prefer IPv6.
My understanding is that this is intended to facilitate the transition from IPv4 to IPv6.
This is host-level behavior. I expect that it's unlikely to change. It certainly causes problems for test and measurement in multi-address-family environments - we have struggled with this at ESnet as well. We currently have a separate name for the IPv6 address for most of our testers (e.g. bost-pt1.es.net vs. bost-pt1-v6.es.net). One exception to that is sacr-pt1.es.net (it helps to have a dual-stack host around to see what the behavior of a dual-stack host is).
Thanks,
Eli
On Thu, May 5, 2016 at 9:28 AM, Brian Candler <> wrote:
When I have a maddash mesh which includes hostX.example.com and hostY.example.com, and there are only A records for those names, it runs tests over V4 fine.
But when the names have both A and AAAA records, the tests only run on IPv6; the IPv4 tests stop. This is seen from looking at the collected graphs at the /toolkit/ home page. The v4->v4 and v6->v6 graphs are both listed, but the v4->v4 data stops at the time the AAAA records were added.
(I do realise that the dashboard itself is going to have difficulty rendering a single traffic light where there are multiple data sources, so perhaps that's the underlying cause of this behaviour)
So my question is: is running a maddash where the same hostname has both A and AAAA records not supported? Does this mean I need to create separate v4 and v6 hostnames, *and* create two separate meshes (i.e. one between the v4 interfaces and one between the v6 interfaces?) Or is this likely to be allowed in future?
I can give some sample URLs off-list if required.
Regards,
Brian Candler.
P.S. Running latest perfsonar; these boxes auto-updated to 3.5.1
Eli Dart, Network Engineer NOC: (510) 486-7600
ESnet Office of the CTO (AS293) (800) 333-7638
Lawrence Berkeley National Laboratory
PGP Key fingerprint = C970 F8D3 CFDD 8FFF 5486 343A 2D31 4478 5F82 B2B3
- [perfsonar-user] Mesh where same hostname has both A and AAAA records, Brian Candler, 05/05/2016
- Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records, Andrew Lake, 05/05/2016
- Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records, Brian Candler, 05/05/2016
- Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records, Tim Chown, 05/10/2016
- Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records, Brian Candler, 05/05/2016
- Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records, Eli Dart, 05/05/2016
- <Possible follow-up(s)>
- [perfsonar-user] Mesh where same hostname has both A and AAAA records, Brian Candler, 05/05/2016
- Re: [perfsonar-user] Mesh where same hostname has both A and AAAA records, Andrew Lake, 05/05/2016
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