nanog mailing list archives
Re: DNS Flag Day, Friday, Feb 1st, 2019
From: Mark Tinka <mark.tinka () seacom mu>
Date: Thu, 31 Jan 2019 19:04:40 +0200
On 31/Jan/19 18:32, James Stahr wrote:
I think the advertised testing tool may be flawed as blocking TCP/53 is enough to receive a STOP from the dnsflagday web site. It's been my (possibly flawed) understanding that TCP/53 is an option for clients but primarily it is a mechanism for the *server* to request the client communicate using TCP/53 instead - this could be due to UDP response size, anti-spoofing controls, etc...
On a similar note, we tested for all our self-hosted zones OK 2 weeks ago. However, in previous days, the summary result said "NO GOOD, THINGS WILL BE SLOW COME FLAG DAY". The detailed test showed IPv4 tested perfect, but IPv6 probes timed out. The issue turned out to be an internal IPv6 routing/forwarding issue for our service within Century Link's (Level(3)'s) network. CL finally fixed that issue today and the flag day test tool is happy again. Some of our partners/customers were concerned our name servers were not ready, based purely on the summary result of the test tool. Perhaps adding some intelligence about whether the issue is the name server or the transport may be helpful. Mark.
Current thread:
- Re: DNS Flag Day, Friday, Feb 1st, 2019, (continued)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 30)
- Message not available
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 30)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Radu-Adrian Feurdean (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Matthew Petach (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Jimmy Hess (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Stephen Satchell (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 James Stahr (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Tinka (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Jimmy Hess (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Doug Barton (Jan 31)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Mark Andrews (Jan 31)
- RE: DNS Flag Day, Friday, Feb 1st, 2019 Keith Medcalf (Jan 30)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Christopher Morrow (Jan 30)
- Re: DNS Flag Day, Friday, Feb 1st, 2019 Owen DeLong (Jan 31)