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From: mm0fmf <none@invalid.com>
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Subject: Re: Getting along without a keyboard
Date: Tue, 17 Sep 2024 12:18:45 +0100
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On 16/09/2024 21:41, druck wrote:
> On 15/09/2024 23:37, bp@www.zefox.net wrote:
>> Chris Green <cl@isbd.net> wrote:
>>> 3 - Is the Pi2 connected to the same network/router as the Pi5?
>> The DHCP range is limited to 192.168.1.nnn, with no distinction between
>> wired and wireless connections. There's clearly bridging from wirless to
>> wired devices such as the printer, which works and can be pinged.
> 
> Unfortunately at one location I have to use an externally managed 
> router/AP which bridges wireless and wired networks, but not between 
> 2.4GHz and 5GHz WiFi.
> 
> I couldn't talk to a Pi Zero which only uses 2.4GHz from the laptop 
> which had connected to 5GHz. I had to go via another Raspberry Pi which 
> was connected by Ethernet and could see devices both WiFi frequencies.
> 
> ---druck

That's AP Isolation at work.  It stops Wifi devices communicating with 
each. The idea is if you have lots of guest devices connecting, AP 
Isolation stops them talking direct to each other and is meant to limit 
a rogue guest device ability to do bad things to other guests.