Ethereal-users: Re: [Ethereal-users] Source/Destination Display (bug?)

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From: "Mike Kenning" <mkenning@xxxxxxxx>
Date: Fri, 27 Oct 2000 21:45:41 -0700
- 0.8.13
  Correct startup/shutdown of windows sockets for name resolution (Graham)

It looks like a fix for the broken DNS lookups was incorporated in the new
release.  It's working great for me now.

Hats off to the author of the fix, I believe it was Graham Bloice.  Thanks!

Mike K.

----- Original Message -----
From: "Mike Kenning" <mkenning@xxxxxxxx>
To: "Guy Harris" <gharris@xxxxxxxxxxxx>
Cc: <ethereal-users@xxxxxxxxxxxx>; <rickard@xxxxxxxxxxxxx>
Sent: October 23, 2000 11:39 PM
Subject: Re: [Ethereal-users] Source/Destination Display (bug?)


> I'm not seeing DNS queries failing.  It looks like Ethereal is not trying
to
> translate, it does not generate any DNS queries.
>
> As an experiment, I just ran Ethereal and Tethereal simultaneously on the
> same PC.  Tethereal is issuing DNS queries and displaying the resolved
names
> in place of the IP addresses.  Ethereal is still only displaying IP
> addresses, no names.
>
> I've tried every option/setting I could find including adding the
"resolved
> address" columns; and turning off name resolving and then using the
> right-click menu option to resolve names.  Nothing happens... no DNS
> queries, no resolved names.
>
> As I said, I'm not sure what makes Ethereal work properly every once in
> awhile... I've tried to repeat the success I had once before when running
> Tethereal first before Ethereal - but no luck, Ethereal refused to resolve
> the next time I tried it.
>
> Mike K
>
> ----- Original Message -----
> From: "Guy Harris" <gharris@xxxxxxxxxxxx>
> To: "Mike Kenning" <mkenning@xxxxxxxx>
> Cc: <ethereal-users@xxxxxxxxxxxx>; <rickard@xxxxxxxxxxxxx>;
> <gharris@xxxxxxxxxxxx>
> Sent: October 23, 2000 10:58 PM
> Subject: Re: [Ethereal-users] Source/Destination Display (bug?)
>
>
> > On Mon, Oct 23, 2000 at 10:45:58PM -0700, Mike Kenning wrote:
> > > Nearly every time I use Ethereal it is not doing any IP address to DNS
> name
> > > resolution for Source and Destination addresses, even though I have th
e
> > > "Enable name resolution" option on (both for Capture and Display).
> > > Sometimes it will resolve an address or two by learning from a DNS
> response
> > > that goes past in the trace, but it never issues its own DNS queries.
> >
> > I.e., you haven't seen DNS queries while watching the network to which
> > the machine running Ethereal is connected?  (If it displays IP addresses
> > rather than host names, that could either be due to Ethereal not trying
> > to translate the IP address to a host name or due to it trying to do so
> > but failing, either because there's no "in-addr.arpa" DNS entry for that
> > IP address, or because the DNS server didn't respond.)
> >
> > Ethereal doesn't itself contain code to issue DNS queries; it calls the
> > routine "gethostbyaddr()" (which, on Windows, should be part of the
> > Winsock library, I suspect), which should issue those queries.
> >
> > It should do that if the internal "Enable name resolution" flag is set;
> > if it's not even sending out DNS queries, perhaps that flag getting
> > unset internally, somehow, even though you've requested it, or perhaps
> > there's something broken in the Winsock library.
> >
> > > However, just a couple of times it actually has worked and resolves IP
> to
> > > DNS names by issuing it's own DNS queries for each new IP address that
> > > appears in the trace.  I'm not sure what triggers it to start working,
> but
> > > one time it was after I ran the text-based version Tethereal first.
By
> the
> > > way, Tethereal 0.8.12 always seems to work for me by resolving IP to
> names
> > > via it's own DNS queries.  I'm sure this is what Ethereal is supposed
to
> be
> > > doing also, but it seems to be broken.
> >
> > That suggests some weird problem with Winsock (or perhaps suggests that
> > somehow Ethereal is scribbling on Winsock's data).
> >
>
>
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