[Scottish] Strange DNS problem

Thu Aug 29 14:49:03 2002

So DNS may well be up, you just can't see it - it's the network that's down,
got any crontabs running monthly on the 27th?
what does an ifconfig and a route show give when your getting this outage?
maybe even a dump of netstat -ap might reveal something, are your modem
light (dial-up right?) going mental when you are down, is someone dossing
you for a few hours a month?

Rgds,

Ian

-----Original Message-----
From: Ben Thorp [mailto:THORPB@uk.ibm.com]
Sent: 29 August 2002 14:05
To: scottish@mailman.lug.org.uk
Subject: RE: [Scottish] Strange DNS problem

>You say DNS outage but I'm not sure how you come to that conclusion.

Because I don't know what I talking about :o(

>Were
>you able to resolve names to IP addresses and then unable to reach those
>addresses?

I was not able to ping addresses. First time round I thought the DNS was
out because I couldn't ping the IP address of the server, but this time I
realised that I couldn't ping any of the DNS addresses I had.

>If so this would not be a DNS failure but sounds more like a
>routing problem.  Or were you unable to resolve names but could reach any
>(previously known) IP addresses?  This would be a DNS outage and if you
use
>names for mail/ping/web then would obviously mean you could not reach
those
>services (but only because you didn't know the address.  How this would
>occur if you had 3 DNS servers configured is strange, if one was not
>responding then the others whould be used.

>Why the 27th of each month?  Why
>not?  Maybe they update user accounts on a monthly basis and it is not a
>transparent process, who knows.

Remember - now been using 2 ISP (+Freeserve as a test) and none worked.

The only thought in my mind was the fact that 27 is the biggest positive
number for a signed 5-bit binary word (-28 to +27 if I remember correctly)
but this seemed a little far fetched.

>MC

Ben

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