On Thu, 25 Aug 2011, Patrik Fältström wrote:

On 25 aug 2011, at 17:52, Paul Wouters wrote:

I think the easiest is to configure multiple unbound instances. One with 
defaults, one with do-tcp:no

In svn there is also the tcp-upstream:yes|no option that controls if tcp can be 
used by the resolver to obtain data (as opposed to the client method of 
accessing unbound itself)

Hmm...I am using pyldns as a stub resolver, so what you suggest is not really 
helping.

have a look at http://git.xelerance.com/cgi-bin/gitweb.cgi?p=ldnsx.git;a=summary

If there is functionality you need exposed, Chris will be able to implement 
them for you.

I know he has usage cases where he sets TCP specifically. Though then you're 
not using unbound
(or its cache), as the client cannot tell the server how it should fetch 
results. And even if
we'd add such a flag, how would you deal with cached data?

If you are trying to figure out TCP or EDNS connectivity, you cannot really go 
through an
intermediate resolver (unless you're just testing this specific last mile 
resolver)

If you can tell us a bit more, perhaps we can help you, as we're doing similar 
things with
ldnsx on top of ldns-python.

Paul
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