Re: DNS Lookup

At 9:22 AM -0700 10/12/01, Tenon Support wrote:
>
>WebTen does not have a problem with cnames.

Why, after my DNS server returns the CNAME record, do I not then see a query 
(at the name server) for the host name to which the original host is CNAMEd? I 
don't see the second query.

>
>WebTen does a lookup to the specified DNS server.  If the server cannot get 
>the entry it will return a 'no such host' error.

Since the machine queried for the lookup is authoritative for that host, it 
doesn't seem likely that the lookup (the first -part, the CNAME) is failing. 
I've heard no explanation for why WT does not then do a subsequent lookup for 
the A record.

>There is really no such thing as a recursive lookup from the client side. 

Of course not. But WT doesn't know if recursion is necessary or not for the 
query it made. It therefore shouldn't conclude, in less time than it would take 
for a recursive lookup, that the lookup failed.

>The server either returns the requested info or it returns failed, and WebTen 
>will wait for the response.  If your DNS is set up correctly it should get the 
>entry in well less than a second.

Agreed. Funny thing is though, when I went to my web browser and entered the 
VHost name (before it was successfully added) I hit my WebTen server just fine, 
and I was fed the default site, as I should have been. So, the browser's lookup 
resolved to the correct IP address.

In fact, I Timbuktu'd to the WT machine and opened a web browser there and 
entered the VHost I was trying to add. It too hit the WT server. So, a browser 
on the same machine as WebTen can find the IP address, but WT itself cannot.

>If OpenTransport and WebTen have different specified DNS servers, this could 
>be the problem.

Well, I was using a non-authoritative DNS server for WT until I tried adding a 
VHost and had this problem. I I changed the DNS server configured in WT to be 
my own, authoritative server. Restarted WT and got the same failed result -- 
but only when it was WT doing the lookup.

>Open a shell window and type:
>
>ping www2.thecassandraproject.org
>
>Does it return an error?  If it works correctly you may want to restart the 
>admin server.  If it does not work correctly, reset the DNS server for WebTen 
>and restart it

The next time I try to add a VHost and have this problem, I'll try this.

Still unanswered:

1) Why don't I see a second lookup at the DNS server when the lookup of the 
VHost being added returns a CNAME?

2) Why does WT do a lookup on other configured VHosts when I am doing an add of 
a new VHost?

-- 

Internet Tools for Business --  <http://www.CyberSpaces.net/>
E-commerce web hosting


---------                    ----------
Tenon Intersystems' webten Mailing List
To unsubscribe: send mailto://webten-request@xxxxxxxxxxxxxxx
with the body: unsubscribe
Find searchable Mailing List archives at:
http://listsearch.blueworld.com/webtensearch.lasso