On 6/9/23 18:09, Didier Kryn wrote:
> Thanks for your answer, but there is still something I don't
> understand: the laptops also get their network configuration from the
> same DHCP server of the ISP box; how is it then that they get an
> answer from the additional DNS service offered by my desktop?

This is only speculation, but there are local multicast DNS services
that work on a LAN. Perhaps your desktop is advertising its DNS
capability by multicast?