Date: Mon, 28 Aug 2000 15:10:04 -0700 (PDT) From: volf@oasis.IAEhv.nl (Frank Volf) To: freebsd-bugs@FreeBSD.org Subject: Re: kern/20877: ICMP error msg on UDP port unreachable is incorrect Message-ID: <200008282210.PAA28289@freefall.freebsd.org>
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The following reply was made to PR kern/20877; it has been noted by GNATS.
From: volf@oasis.IAEhv.nl (Frank Volf)
To: Sheldon Hearn <sheldonh@uunet.co.za>
Cc: Frank Volf <volf@oasis.IAEhv.nl>,
freebsd-gnats-submit@freebsd.org
Subject: Re: kern/20877: ICMP error msg on UDP port unreachable is incorrect
Date: Mon, 28 Aug 2000 23:59:50 +0200 (CEST)
Sheldon Hearn wrote:
>
> On Sun, 27 Aug 2000 19:45:22 +0200, Frank Volf wrote:
>
> > I disagree with the fact that you simply close this pr as being a duplicate
> > case of PR 16240.
> >
> > PR 16240 tries to address the generic problem, which is indeed present in
> > many network implementations and may or maynot be difficult to fix.
>
> Do you not agree that the resolution to PR 16240 will resolve PR 20877
> as a side-effect?
Yes, I agree. But the impression that I got from PR 16240 is, that the
general problem is too difficult to solve and I got the feeling that it
would not be solved at all....
The reason that I want this fixed are twofold:
1) OS finger printing. Because FreeBSD returns the wrong data, you can
use that information to
2) I'm working on fixing a bug in IP-Filter that has to do with NAT and ICMP
error messages associated with the NAT-ed connection. However, before I
can fix that, I must first make sure that the host OS behaves properly :-)
> I know that we're not altogether keen on applying hack-arounds for more
> general problems unless the more general problems can't be resolved in
> the foreseeable future.
If someone is going to tackle the generic problem, that would be great. But,
then you should say: hey we are working on fixing the general case so we
are closing your PR....
Frank
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