[sf-lug] DNS, testing/troubleshooting ... (Re: Looks great, thanks! Re: linuxmafia.com/svlug.org DNS slaves for sf-lug.{com, org}! :-))

[Rick Moen]

Quoting Michael Paoli (Michael.Paoli at cal.berkeley.edu):

> Dang, over 24 hours and nobody else took a stab at it and posted to the
> list?

I'll readily confess that I didn't try because I lacked time and also
had never noticed or used dig's +nssearch flag before you demonstrated
its usage.  (As you say, there's a lot to be said for re-reading man
pages occasionally.)

I see it boils down to 'find and report the authoritative name servers 
for this DNS zone using iterative queries only (not recursive ones), 
and return each one's copy of the SOA record'.



> Anyway, some hints:
> $ dig -4 sf-lug.com. +nssearch

(Return values show _no_ timeouts with the IPv4-only querying flag '-4'
added.)

I'm guessing your local nameserver was timing out on the IPv6 phrase of
the queries it made when you said 'dig +nssearch sf-lug.com.' or 
'dig +nssearch sf-lug.org.' (without the -4 flag).  Because it has IPv6
problems whereby things attempt IPv6 queries, fail, timeout, and retry
and succeed on the followup IPv4 attempt.

The laptop in front of me has no timeouts when doing the same queries
with default IP stack semantics (not limited to IPv4 only):

Litte-Datamaskin:~ rick$ dig +nssearch sf-lug.com.
SOA ns1.sf-lug.com. jim.well.com. 2015072000 10800 3600 1209600 10800 from server 198.144.195.186 in 8 ms.
SOA ns1.sf-lug.com. jim.well.com. 2015072000 10800 3600 1209600 10800 from server 64.62.190.98 in 134 ms.
SOA ns1.sf-lug.com. jim.well.com. 2015072000 10800 3600 1209600 10800 from server 198.144.194.12 in 136 ms.
SOA ns1.sf-lug.com. jim.well.com. 2015072000 10800 3600 1209600 10800 from server 208.96.15.252 in 143 ms.
SOA ns1.sf-lug.com. jim.well.com. 2015072000 10800 3600 1209600 10800 from server 72.249.38.88 in 211 ms.
Litte-Datamaskin:~ rick$ dig +nssearch sf-lug.org.
SOA ns1.sf-lug.org. jim.well.com. 113020527 10800 3600 1209600 3600 from server 198.144.195.186 in 4 ms.
SOA ns1.sf-lug.org. jim.well.com. 113020527 10800 3600 1209600 3600 from server 64.62.190.98 in 55 ms.
SOA ns1.sf-lug.org. jim.well.com. 113020527 10800 3600 1209600 3600 from server 198.144.194.12 in 61 ms.
SOA ns1.sf-lug.org. jim.well.com. 113020527 10800 3600 1209600 3600 from server 208.96.15.252 in 69 ms.
SOA ns1.sf-lug.org. jim.well.com. 113020527 10800 3600 1209600 3600 from server 72.249.38.88 in 107 ms.
Litte-Datamaskin:~ rick$ 


('Litte-Datamaskin') is my laptop's hostname in Norsk.  Quick, without
using Google Translate, what does it mean in English?)