DISCOVERs from "unkown network segment" - suppress log messages?

[Brennan,Andrew]

On Nov 28, 2022, at 10:26 AM, Sten Carlsen <stenc at s-carlsen.dk<mailto:stenc at s-carlsen.dk>> wrote:


External.

On 28 Nov 2022, at 16.14, Brennan,Andrew <andrew.brennan at drexel.edu<mailto:andrew.brennan at 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 <tina at ieu.uzh.ch<mailto:tina at 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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