[LINK] Re: Linkers with stray bounces

[Roger Clarke]

Tony Barry <me@Tony-Barry.emu.id.au>:
>Needless to say they are both peeved - and Roger has been sending me 
>the very vigorous and robust comments he is making to his ISP. And 
>while no four letter words were used, the effect was definitely 
>DEFCON 4.

The more constructive parts of my messages to my ISP (:-)} have been 
as follows.  Observations gratefully received!

>550 5.1.2 Roger.Clarke@xamax.com.au... Host unknown (Name server: 
>mail2.apex.net.au.: host not found)
>Reporting-MTA: dns; web.anu.edu.au

The fact that the ANU's DNS server is reporting this means that
{ns1,ns2}.apex.net.au are both unreachable at the same time.
Surely it's a major problem if your name-server(s) can't be found?!

Do you have your two name-servers on separate networks, as required 
under DNS rules?  [Answer received: 'yes'!].

[I was fudging the bit about 'DNS rules require it', because I know 
it would take me too damned long to search through the RFC database; 
but I have a vague memory of reading that sometime]

Surely if your name-servers are both on the same segment there will 
be frequent such glitches.  I thought the norm was for small ISPs to 
team up with distant ISPs, say Canberra with Sydney or Perth, and 
house one another's secondaries ...

-- 
Roger Clarke              http://www.anu.edu.au/people/Roger.Clarke/

Xamax Consultancy Pty Ltd, 78 Sidaway St, Chapman ACT 2611 AUSTRALIA
                 Tel: +61 2 6288 1472, and 6288 6916
mailto:Roger.Clarke@xamax.com.au            http://www.xamax.com.au/

Visiting Professor, Uni of Hong Kong, Dept of Comp Sci and Info Sys
Visiting Fellow, Australian National University, Dept of Comp Sci
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