Resolver error while parsing DNS replies

Alex Rousskov rousskov at
Tue May 27 17:01:17 UTC 2008

On Fri, 2008-05-23 at 17:35 -0700, isb wrote:

> I am trying to replay a trace using Polygraph. I am seeing this error
> when Polygraph's DNS resolver fails to parse DNS replies on certain
> lookups:
> error: 256/256 (c94) failed to parse DNServer response
> In my limited tests, it seems to fail when CNAME records are returned
> in the reply. It also fails on certain other replies. Is this a known
> limitation?

Yes, it is a known limitation. Polygraph does not know how to deal with
CNAME and other non-IP responses.

>  If so, are there any plans to fix it?

It would be nice to add such support, but it is currently only a wish
list item:


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