All nameservers unresponsive when master is down
David Hekimian
davidh at aqueduct.com
Wed Apr 10 20:55:27 UTC 2002
You may also want to upgrade to 9.2.0.
Also check your routing to NS3 -
Here is the output from http://www.squish.net/dnscheck/dnscheck.cgi:
Results
25.0% of queries ended in failure at 195.167.246.3 (NS3.HPDSC.COM) - query
timed out
25.0% of queries returned by 212.158.99.194 (NS1.HPDSC.COM) HPDSC.COM. 0
IN SOA ns1.HPDSC.COM. dnsadmin.hpdsoftware.COM. (
1018449090 ; Serial 7200 ; Refresh 3600 ; Retry
604800 ; Expire 0 ) ; Minimum TTL
25.0% of queries returned by 212.158.99.195 (NS2.HPDSC.COM) HPDSC.COM. 0
IN SOA ns1.HPDSC.COM. dnsadmin.hpdsoftware.COM. (
1018449090 ; Serial 7200 ; Refresh 3600 ; Retry
604800 ; Expire 0 ) ; Minimum TTL
25.0% of queries returned by 195.167.246.4 (NS4.HPDSC.COM) HPDSC.COM. 0
IN SOA ns1.HPDSC.COM. dnsadmin.hpdsoftware.COM. (
1018449090 ; Serial 7200 ; Refresh 3600 ; Retry
604800 ; Expire 0 ) ; Minimum TTL
- David
-----Original Message-----
From: Mark_Andrews at isc.org [mailto:Mark_Andrews at isc.org]
Sent: Wednesday, April 10, 2002 8:44 AM
To: Sam Pointer
Cc: 'comp-protocols-dns-bind at isc.org'
Subject: Re: All nameservers unresponsive when master is down
> My domain `hpdsc.com` has 2 "actual" nameservers which we present to the
> world as 4 "logical" nameservers. The 2 boxes are multihomed and all 4
> addresses are given as valid namesevers for the domain (we have 2 leased
> lines and this removes a single point of failure).
>
> My whois informations is:
>
> Domain servers in listed order:
>
> NS2.HPDSC.COM 212.158.99.195
> NS3.HPDSC.COM 195.167.246.3
> NS4.HPDSC.COM 195.167.246.4
> NS1.HPDSC.COM 212.158.99.194 The like-typed
nameserv
> ers
> are actually the same nameserver on the same box (multihomed).
Unless you are playing with /32's you are still subject to single
points of failure.
>
> The relevant part of the Zone data is:
>
> hpdsc.com. IN SOA ns1.hpdsc.com. dnsadmin.hpdsoftware.com. (
> 1018281163 ; Serial
> 7200 ; refresh (2 hour)
> 3600 ; retry (1 hours)
> 604800 ; expire (1 week)
> 1 ; neg. cache
> )
> ...
> hpdsc.com. NS ns1.hpdsc.com.
> hpdsc.com. NS ns2.hpdsc.com.
> hpdsc.com. NS ns3.hpdsc.com.
> hpdsc.com. NS ns4.hpdsc.com.
> ...
>
> ns1.hpdsc.com. IN A 212.158.99.194
> ns2.hpdsc.com. IN A 212.158.99.195
> ns3.hpdsc.com. IN A 195.167.246.3
> ns4.hpdsc.com. IN A 195.167.246.4
Well before you do anything else supply reasonable TTL values.
1 second (above) isn't reasonable nor is zero which the server
currently emitting.
> However, if I stop BIND running on ns1 (which is also ns3 if referenced by
> it's alternative IP address) then the whole Zone stops resolving. And I
> can't for the life of me work out why. If you want to tell me to "FAQ off"
> then please do.
Well the zone resolves fine except for some delays cause by the
zero TTLs you are currently using.
>
> Any help/pointers/soothing words of calm would be most appreciated: I'm
> terrified on ns1/ns3 falling over! I'm running BIND9.
> _________________________________________
>
>
> Sam Pointer - HPD Software Ltd.
> Email: sam.pointer at hpdsoftware.com
>
> Sites: http://slashdot.org http://www.perl.com http://eff.org
> http://www.gnu.org/software/hurd/hurd.html
>
>
>
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>
--
Mark Andrews, Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742 INTERNET: Mark.Andrews at isc.org
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