OT: strange network problem

[Ohad Levy]

On Tue, Jan 11, 2022 at 9:19 AM Erez D <erez0001 at gmail.com> wrote:

> The windows 169.25. ip is from APIPA and not from any DHCP server
> (ipconfig does not specify a dhcp server).
> to be on the safe side I verified udp port 67 is unused on my mac (via
> netstat, fuser and socat)
>
> what boggles me is why can't the window machine access the router and get
> an ip when the mac is sleeping
>
> as the AP switch is layer 2, i would susspect the switch disables the
> windows machin for some reason,
> e.g. it sees the same mac address from another port or detects abuse of
> somewhat from the windows eth port
> however i do not understand how is this related to the mac sleeping
>
> I thought the AP switch maybe defective but puting another GB switch
> instead causes the same results ...
>

can you run tcpdump on your router? does it show the dhcp requests from
your windows machine?

>
> why do you thing HOMEGROUP is related ? it is a higher layer protocol when
> the problems seems to me on layer 2
>
> Thanks,
> Erez
>
>
>
>
> On Tue, Jan 11, 2022 at 8:36 AM <borissh1983 at gmail.com> wrote:
>
>> On Monday, 10 January 2022 19:30:55 IST Erez D wrote:
>> > I've encountered a network problem
>> >
>> > i have a mac and a win10 machine connected to a 4 port Gbit wifi6 AP
>> > (switch mode).
>> > a third eth from the AP goes to the router which is also a DHCP server
>> >
>> > everything works well until the mac goes to sleep.
>> > when the mac goes to sleep, the win10 machine looses it's ip address
>> > which becomes a 169. address
>> >
>> > as soon as i wake the mac up, the win machine regain a valid 10.0.0.x ip
>> >
>> > i tried to replace the AP with a 4 port switch and got same results
>> >
>> >
>> > any idea ?
>> >
>>
>> IP in the  169.254.0.0/16 range is related to bonjour protocol , it is a
>> link local communication.
>>
>> your windows would move to a bonjur ip in many cases but most common that
>> can happen if your machine has a bonjour service enabled and an Ethernet
>> card with dhcp that can not get an ip from the router.
>>
>> 1. Check if when the mac is running your windows machine got it's ip from
>> the mac and not from the router. in some cases mac can have dhcpd running
>> on it, if that is the case you should disable it if you do not need it.
>> 2. Check if homegroup is enabled on win10, if it is disable it (by
>> version 1803 it is no longer active by default, but you could have hacked
>> to enable it).
>>
>>
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