OT: strange network problem

[Erez D]

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 ...

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 1803 it is no longer active by default, but you could have hacked to enable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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