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From: Sven Anders <anders@anduras.de>
To: Henrik Nordstrom <hno@marasystems.com>
Cc: netfilter-devel@lists.netfilter.org
Subject: Re: New API / POM modules to merge....
Date: Tue, 09 Nov 2004 22:54:00 +0100	[thread overview]
Message-ID: <41913C78.6050109@anduras.de> (raw)
In-Reply-To: <Pine.LNX.4.61.0411092003470.7243@filer.marasystems.com>

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Henrik Nordstrom wrote:

|> Some question:
|>
|> ~ 1. "TTL or HOPLIMIT: no, it's dangerous"
|> ~    Why? Don't use it, if it's dangerous - or does it crash the kernel?
|
| It (TTL) in it's current form violates fundamental aspects of IP, easily
| allowing the administrator to "accidently" create configurations which
| will crash the network.
|
| In case of the TTL match it should be sufficient to change
|
|         if (new_ttl != iph->ttl) {
| to
|         if (new_ttl < iph->ttl) {
|
| and remove the increase option to make it safe, but at the same time you
| loose a lot of the powers of this target so it may not be desireable to
| make this change..

But does a possible misconfiguration justify this?
Simply mark this match as "DANGEROUS" or make the 'Increase' optional.

You did not remove pointers from C, because you could do something wrong... :-)

Regards
~ Sven

- --
~ Sven Anders <anders@anduras.de>

~ ANDURAS service solutions AG
~ Innstraße 71 - 94036 Passau - Germany
~ Web: www.anduras.de - Tel: +49 (0)851-4 90 50-0 - Fax: +49 (0)851-4 90 50-55

Rechtsform: Aktiengesellschaft - Sitz: Passau - Amtsgericht Passau HRB 6032
Mitglieder des Vorstands: Sven Anders, Marcus Junker, Michael Schön
Vorsitzender des Aufsichtsrats: Dipl. Kfm. Karlheinz Antesberger
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  reply	other threads:[~2004-11-09 21:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20041108134743.217B817BE5@grasshopper.anduras.de>
2004-11-08 20:28 ` Re: Unique rule ID?! Sven Anders
2004-11-08 21:32   ` Henrik Nordstrom
2004-11-09 15:53     ` New API / POM modules to merge.... (was: Unique rule ID?!) Sven Anders
2004-11-09 19:09       ` Henrik Nordstrom
2004-11-09 21:54         ` Sven Anders [this message]
2004-11-09 23:07           ` New API / POM modules to merge Henrik Nordstrom
2004-11-09 23:16             ` Patrick McHardy
2004-11-09 23:27               ` Sven Anders
2004-11-09 23:55                 ` Patrick McHardy
2004-11-09 23:46               ` Henrik Nordstrom

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