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Today's Topics:
1. Re: DISCOVERs from "unkown network segment" - suppress log
messages? (Sten Carlsen)
2. Re: DISCOVERs from "unkown network segment" - suppress log
messages? (Brennan,Andrew)
----------------------------------------------------------------------
Message: 1
Date: Mon, 28 Nov 2022 16:26:26 +0100
From: Sten Carlsen <st...@s-carlsen.dk>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DISCOVERs from "unkown network segment" - suppress log
messages?
Message-ID: <e9d54484-43e8-4869-ac8d-7d0fb4c5a...@s-carlsen.dk>
Content-Type: text/plain; charset="utf-8"
> On 28 Nov 2022, at 16.14, Brennan,Andrew <andrew.bren...@drexel.edu> wrote:
>
> I?m of the mind that ?embedded OS networking? is frequently crap and I don?t
> trust them to get anything right, but maybe the end-run here is to have the
> guy with the printer simply stick a manually configured, static IP on there?
I come to think of an earlier thread where some printers were described that
would only accept a lease of more than IIRC one year - this could be one of
those.
If you hand out bogus leases, make them 10 years or so.
>
> Or (if feeling malicious), feed the damn printer bad network settings until
> it stops asking your server for them?
>
> andrew.
>
>> On Nov 28, 2022, at 9:36 AM, Christina Siegenthaler <t...@ieu.uzh.ch
>> <mailto:t...@ieu.uzh.ch>> wrote:
>>
>> Tried that today, unfortunately to no avail. macOS has pf installed, but
>> obviously pf does not / cannot block DHCP packets or the other way round,
>> dhcpd grabs the DISCOVERs before pf rules come into effect. So I?m back to
>> field one?
>>
>> Any other ideas?
>>
>>
>> Thanks, Tina
>>
>
> --
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
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Message: 2
Date: Mon, 28 Nov 2022 15:30:54 +0000
From: "Brennan,Andrew" <andrew.bren...@drexel.edu>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: DISCOVERs from "unkown network segment" - suppress log
messages?
Message-ID: <341ba48c-c121-4fc5-8881-12edccf5f...@drexel.edu>
Content-Type: text/plain; charset="utf-8"
On Nov 28, 2022, at 10:26 AM, Sten Carlsen
<st...@s-carlsen.dk<mailto:st...@s-carlsen.dk>> wrote:
External.
On 28 Nov 2022, at 16.14, Brennan,Andrew
<andrew.bren...@drexel.edu<mailto:andrew.bren...@drexel.edu>> wrote:
I?m of the mind that ?embedded OS networking? is frequently crap and I don?t
trust them to get anything right, but maybe the end-run here is to have the guy
with the printer simply stick a manually configured, static IP on there?
I come to think of an earlier thread where some printers were described that
would only accept a lease of more than IIRC one year - this could be one of
those.
If you hand out bogus leases, make them 10 years or so.
My favorite one of these that I?ve had to deal with was where the network might
be larger than /24, but if the device had been assigned a x.x.x.0 or x.x.x.255
address ? the networking stack would choke.
Or (if feeling malicious), feed the damn printer bad network settings until it
stops asking your server for them?
andrew.
On Nov 28, 2022, at 9:36 AM, Christina Siegenthaler
<t...@ieu.uzh.ch<mailto:t...@ieu.uzh.ch>> wrote:
Tried that today, unfortunately to no avail. macOS has pf installed, but
obviously pf does not / cannot block DHCP packets or the other way round, dhcpd
grabs the DISCOVERs before pf rules come into effect. So I?m back to field one?
Any other ideas?
Thanks, Tina
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