Timeout and NS specification

Unbound
1

Hi,

I have read through

http://www.unbound.net/documentation/info_timeout.html

and understood that there is basically no way I could specify a
timeout of the resolve operation? Say, I'd like to perform this query
using UDP, 3 attempts with 5 seconds timeout (15 seconds max timeout).

Another question, can I specify that I need to make a TCP request?

Also I could not find a way to specify a particular nameserver when
doing a request, is unbound always using a local resolver
configuration (resolv.conf)? I basically need to specify an NS for
every request, e. g. I can not just have a list in resolv.conf or
something.

I am using an async call ub_resolve_async() .

Please, let me know if you know some other library that I should be using.

Cheers,

VL

2

Hi,

I have read through

http://www.unbound.net/documentation/info_timeout.html

and understood that there is basically no way I could specify a
timeout of the resolve operation? Say, I'd like to perform this query
using UDP, 3 attempts with 5 seconds timeout (15 seconds max timeout).

Another question, can I specify that I need to make a TCP request?

Also I could not find a way to specify a particular nameserver when
doing a request, is unbound always using a local resolver
configuration (resolv.conf)? I basically need to specify an NS for
every request, e. g. I can not just have a list in resolv.conf or
something.

I am using an async call ub_resolve_async() .

Please, let me know if you know some other library that I should be using.

I have noticed that this list is active after all. :slight_smile: Good, maybe I
just asked my questions in too complicated way. I'll try to keep it
short and simple.

1). Is there a way I could specify the timeout and number of retries
with a query?
2). Is there a way I could specify TCP/UDP to use when doing a query?
3). Is there a way I could specify a target nameserver with every
query I make (without reading a file containing nameserver entries)?

Cheers,

VL

3

Hi Vladimir,

4

Hi Wouter,

1). Is there a way I could specify the timeout and number of
retries with a query? 2). Is there a way I could specify TCP/UDP to
use when doing a query? 3). Is there a way I could specify a target
nameserver with every query I make (without reading a file
containing nameserver entries)?

No, no and no. Unbound picks the fastest server (or probes for
servers). It falls back to TCP when it receives a +TC flag.

Are you looking for libldns, where you can specify this?

Thank you for the answer! Exactly, I'm looking for (and already using)
ldns. But was missing the async functionality you have in unbound. I
guess I will just have to take care of parallelization myself. :slight_smile:

Cheers,

VL

5

https://code.google.com/p/evldns/ perhaps?

Paul

6

Hi Paul,

Are you looking for libldns, where you can specify this?

Thank you for the answer! Exactly, I'm looking for (and already using)
ldns. But was missing the async functionality you have in unbound. I
guess I will just have to take care of parallelization myself. :slight_smile:

https://code.google.com/p/evldns/ perhaps?

Thanks for the suggestion but it looks like it's not exactly what I
need. I don't need to implement a DNS server I basically need to test
the responsiveness of the particular name servers. Besides it's
written that evldns is single-threaded but I could use some
parallelization.

Cheers,

VL

7

Op 19-06-13 16:19, Paul Wouters schreef:

https://code.google.com/p/evldns/ perhaps?

like!