[LINK] Yet More Strange DNS Behaviour

[Peter Batchelor]

I had the same problem in Melbourne yesterday.
On my Win98 PC, web access went down mid afternoon, but mail was still ok 
for another  hour or so and then it stopped as well.
To make it even stranger, when I used my Mac there weren't any problems at 
all with web access (same DNS settings as the PC).
Any ideas why?
Even some of the Telstra pages kept timing out for me, and I have to say 
that their new design makes it really hard to find the support pages. I had 
to do a search to find it...  (and I thought the old design was pretty bad 
- this is far worse!)

Cheers, Peter

At 22:21 20/11/02 +1100, Roger Clarke wrote:

>Telstra ADSL was a complete mess this afternoon.
>
>I'm still on my fallback dial-up connection, and testing to see if the 
>Telstra Support Page (which is *dreadful* HTML, but that's another story) 
>is telling the truth when it says that nothing's wrong (and, by 
>implication, that nothing ever *was* wrong ...).
>
>But I get rather strange behaviour.
>
>A traceroute to my normal SMTP server, at:
>mail-hub.bigpond.net.au
>implies that what I asked to speak to was:
>203.18.76.88    pitt7-ispmail-r02.nsw.ipm.bigpond.com (details below)
>
>If I do a domain-name lookup, I get:
>mail-hub.bigpond.net.au = 144.135.25.13, 144.135.24.13
>
>I assumed that:
>(a)  a Mac Interarchy 4.1 domain-name lookup simply asks the DNS for the
>      IP-address corresponding to the domain-name provided;  and
>(b)  a Mac Interarchy 4.1 traceroute uses the DNS to look up the IP-address
>      and then sends packets in that hopscotch-style pattern to successive
>      nodes along the route until it gets a time-measure back from the
>      target IP-address, i.e. the requested domain-name (orright, substitute
>      node-name for domain-name, but if you've got this far, then you know
>      what I mean).
>
>But judging by the above data, my assumption must be wrong !?
>
>Why does a traceroute to A return a set of data for B??
>
>
>
>1       3/3     0.111   0.115   0.120   203.20.62.3     cisco1.apex.net.au
>2       3/3     0.118   0.127   0.144   203.20.62.18
>3       3/3     0.112   0.137   0.153   203.20.62.1
>4       3/3     0.101   0.121   0.158   203.220.47.73
>5       3/3     0.153   0.173   0.198   203.194.57.61
>6       3/3     0.123   0.151   0.168   203.194.1.25 
>s3-0.cor02-kent-syd.comindico.com.au
>7       3/3     0.138   0.153   0.178   203.194.1.2 
>pos3-0-0.cor01-dryb-mel.comindico.com.au
>8       3/3     0.126   0.144   0.176   203.194.56.56 
>fe1-0.bdr01-dryb-mel.comindico.com.au
>9       3/3     0.130   0.163   0.221   202.139.138.197 
>atm11-0-0-19.mn1.optus.net.au
>10      3/3     0.135   0.144   0.159   139.130.6.25 
>pos-6-1-0.lon20.melbourne.telstra.net
>11      3/3     0.127   0.182   0.260   203.50.79.129 
>gigabitethernet3-0.win-core1.melbourne.telstra.net
>12      3/3     0.121   0.137   0.167   203.50.6.165 
>pos2-0.ken-core4.sydney.telstra.net
>13      3/3     0.154   0.176   0.191   203.50.19.168 
>gigabitethernet1-1.chw30.sydney.telstra.net
>14      3/3     0.126   0.134   0.150   139.130.7.10 
>bphcwip3.lnk.telstra.net
>15              0.132   0.180   0.229   203.18.76.88 
>pitt7-ispmail-r02.nsw.ipm.bigpond.com
>
>--
>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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