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Old 07-06-2008, 06:03 PM
 
Default Bug#431066: install network/ip-up.d script to check for IP duplicates

On Jun 29, Robert Millan <robert.millan@ackstorm.es> wrote:

> Note that duplicate IPs can be very harmful and even cause loss of data. For
Come on, how often this happens? And it's disabled by default anyway.
The major effect of this patch is to waste time on almost every system
every time *any* interface is raised.
It's concerning that more and more packages are adding useless scripts
to the if-*.d directories, apparently without thinking about the
consequences for firewalls with a large number of interfaces.

--
ciao,
Marco
 
Old 07-07-2008, 11:20 AM
Bastian Blank
 
Default Bug#431066: install network/ip-up.d script to check for IP duplicates

On Mon, Jul 07, 2008 at 01:48:23AM +0100, Ben Hutchings wrote:
> On Sun, Jul 06, 2008 at 08:03:13PM +0200, Marco d'Itri wrote:
> > On Jun 29, Robert Millan <robert.millan@ackstorm.es> wrote:
> > Come on, how often this happens? And it's disabled by default anyway.
> > The major effect of this patch is to waste time on almost every system
> > every time *any* interface is raised.
> And DHCP clients should double-check their assigned address with ARP
> anyway, so it's duplicating this check on most systems.

Where is this specified? The DHCP server is authorative about the
addresses it assigns.

Bastian

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Old 07-07-2008, 11:23 AM
Bastian Blank
 
Default Bug#431066: install network/ip-up.d script to check for IP duplicates

On Mon, Jul 07, 2008 at 11:28:51AM +0200, Bernd Eckenfels wrote:
> IMHO it is an RFC requirement, however the solution with a synchronous
> script is not that well suited for default-on.

Can you please stat which RFC? Especially as there are many setups where
it can't check if an address is already used.

Bastian

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Old 07-07-2008, 11:38 AM
Bastian Blank
 
Default Bug#431066: install network/ip-up.d script to check for IP duplicates

On Mon, Jul 07, 2008 at 01:20:47PM +0200, Bastian Blank wrote:
> > And DHCP clients should double-check their assigned address with ARP
> > anyway, so it's duplicating this check on most systems.
> Where is this specified? The DHCP server is authorative about the
> addresses it assigns.

ISC dhcp seems to implement the state in the scripts, but never actually
run such a check.

Just to outline the consequences of such a check: Windows systems does
this and I managed to make all of them remove there (static assigned)
address. It is a DoS only using ARP packets.

Bastian

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Old 07-08-2008, 10:39 PM
Wouter Verhelst
 
Default Bug#431066: install network/ip-up.d script to check for IP duplicates

On Mon, Jul 07, 2008 at 11:28:51AM +0200, Bernd Eckenfels wrote:
> In article <20080707004823.GZ7253@decadentplace.org.uk> you wrote:
> > Seems like this script really belongs in the examples directory.
>
> IMHO it is an RFC requirement, however the solution with a synchronous

Eh, that does not parse. Either it is a matter of opinion, or it is a
matter of standard. Please pick one, not both; they are incompatible.

--
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