[CLUG] DNS?

[Dermot McGahon]

> I'd be quite interested in hearing more stories, backed up by solid, 
> competent evidence, which I'm quite sure I'm not going to find on 
> Boards.ie, so, I'll not be looking there personally, but if anyone has 
> any please post here.

Daragh,

This thread started, because yesterday, two companies connected over
Eircom DSL, noticed that they couldn't load certain webpages.

Our Dublin office verified that they could view the sites. They are
connected over Esat DSL.

A friend in Cork verified that he could view the sites over their
leased line connection.

Adam verified that he could view the sites over UTV Internet DSL.

I double and triple checked our configuration locally.

On the phone to the Dublin office we compared pings and traceroutes.

They were pretty much the same. Differences would be expected as
we are connected to different networks, but the endpoints were the
same (usually firewalls).

This led my colleague to believe that it was similar to other issues
he has seen in the past, where the ISP doesn't, for some reason that
I don't understand, route the http traffic back to the subscriber.

I don't know the exact technical details. I would tell you if I did.

I'm fairly convinced that this was an Eircom issue. The only thing
that I wasn't able to check during the outage was if another Cork
based Eircom DSL subscriber could view the sites, but I suspect that
they wouldn't have been able to.

Daragh, I will keep a note of your email address and if this happens
again, I will let you know immediately so that you can investigate
 from your end.


Dermot.
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