Re: [Dproxy-devel] 0.5 vs nexgen?

[Matthew P. <mat...@ya...>]

--- Mark Horn
<mar...@ho...> wrote:
> Hello,
> 
> I've been looking for something like dproxy for some
> time now and am
> glad that I found it.  I have a question re:
> dproxy's behavior.
> 
> The behavior that is exhibited in 0.5 is what I was
> looking for.
> Specifically, I wanted a DNS proxy that could listen
> for requests on my
> private network, and then generate queries to one of
> several different
> networks each with different DNS servers.

If I'm understanding what you are saying, then the
nexgen version should be able to do this as well.
 
Just list the multiple servers in the config file. The
OS should take care of routing them over the correct
network.

> The 0.5 behavior did not require you to
> pre-configure a DNS server in
> dproxy's config, but nexgen does.  This behavior
> does not really do
> what I'm looking for, and I'm much more interested
> in the 0.5 behavior,
> which indirectly uses /etc/resolve.conf.

Could you please explain a little more?

> Is this a strategic design change or an experiment? 
> If this is strategic,
> will the 0.5 behavior be available in future
> releases?

It is a strategic design. Basically since
gethostbyname() is blocking we fork a new process for
each query. Unfortunately this leads to syncronisation
issues when writing back to the cache file, and is
quite a heavy weight solution.

I deemed it easier and more efficient to write my own
resolvers than work out these issues.

Having thought about this some more, it may not be so
hard to fix these issues, and if nexgen truly doesn't
suite your needs I could have a go at implementing
these.

One thing that the nexgen version does that the 0.5
version doesn't  is parallel queries. It will
simultaneously query all the DNS servers listed in its
config file and reply with which ever anwser happens
to come back first.

Matt


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