UDNS issue

[Abhijit Pandey]

Hi Michael,

Setting $ RES_OPTIONS="udpbuf=512" ./dnsget ...   did solved the problem.

I was using Rich formatting of Gmail, which probably your E-mail
client didn't understand.

I am investigating using UDNS for asynchronous queries(A and TXT
records), in a production environment for heavy loads.
dnsget seems to give a fairly good idea, of how to use the API's

I see UDNS is being used in various distributions(Gentoo/Ubuntu/Fedora etc).
Hopefully I wouldn't any bugs to fix.

Thanks and Regards,
Abhijit






On Mon, Feb 2, 2009 at 12:31 AM, Michael Tokarev <mjt+udns at corpit.ru> wrote:
>
> Abhijit Pandey wrote:
> > Hi Michael,
> >
> > Thanks for your mail. Couple more question.
> > I don't have a DNS server running locally.
> >
> > Is UDNS not maintaing the resolver cache on my PC?
>
> There's no "resolver cache" on "your PC" unless
> you're running some sort of caching DNS server.
>
> > Does your UDNS also depends on BIND-Utils ?
>
> No.
>
> > 1) Here is the output when I rerun the Query.
> >           I see the additional section and Answer section getting flipped.
>
> Aha.  I see.
> Damn.  Your email is garbled quite seriously, all this http:// cruft...
>
> > [apandey at localhost udns-0.0.9]$ ./dnsget -vv www.yahoo.com
>
> > ;; received 58 bytes response from 192.168.15.1 port 53
> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 30366, size: 58
> > ;; flags: qr rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
> >
> > ;; QUERY SECTION (1):
> > ;www.yahoo.com IN A
> >
> > ;; ANSWER section (1):
> > ;EDNS0 OPT record (UDPsize: 4096): 0 bytes
> >
> > ;; ADDITIONAL section (1):
> > www.yahoo.com 10000 IN A 209.131.36.158
> >
> > dnsget: unable to lookup A record for www.yahoo.com: valid domain but no data of requested type
>
> Lovely.  So whatever is running at 192.168.15.1, it looks like it
> does not understand or implement EDNSO properly, AND actually
> garbles the result, because there's no CNAME record shown as below.
> What it is, anyway - I mean, which DNS server is running there?
>
> > Here is the output query when I provide the same arguments 3 times in
> > the command line with -vv mode.
> >
> []
> > ;; received 96 bytes response from 192.168.15.1 port 53
> > ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40089, size: 96
> > ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1
> >
> > ;; QUERY SECTION (1):
> > ;www.yahoo.com <http://www.yahoo.com>. IN A
> >
> > ;; ANSWER section (2):
> > www.yahoo.com <http://www.yahoo.com>. 110 IN CNAME
> > www.yahoo-ht3.akadns.net <http://www.yahoo-ht3.akadns.net>.
> > www.yahoo-ht3.akadns.net <http://www.yahoo-ht3.akadns.net>. 53 IN A
> > 209.131.36.158
> >
> > ;; ADDITIONAL section (1):
> > ;EDNS0 OPT record (UDPsize: 4000): 0 bytes
>
> And this one looks correctly.
>
> Try this:
>
>  $ RES_OPTIONS="udpbuf=512" ./dnsget ...
>
> (i.e, set variable RES_OPTIONS to value "udpbuf=512" before
> running the test).  It should fix the problem.  But in any
> way, the proper solution is to fix your resolver running
> at 192.168.15.1.
>
> /mjt