On Thu, Apr 22, 2021 at 6:17 PM Bruce A. Johnson <bjohnson@xxxxxxxxxxxxxxxxxxxxx> wrote:
Silvio, thanks for the suggestion. I'm not concerned with keeping the lease forever; the system actually experiences a topology change as it's switched from one network to another, and I can catch that from the DBus events that occur. The problem we're trying to solve is to contact some address that we're sure exists on the network, without knowing anything about that network. The default gateway was an obvious choice, but someone wants to cover the case of there being a private LAN with no gateway. The only other choice I could see is the DHCP server that issues the lease.
Hmm, don't you also have the case of there being a private LAN with no gateway and no DHCP? Or possibly the case of a DHCP relay. And since you don't know anything about the network, you also don't know whether the address will respond to your communication attempts (other than ARP) -- it might be pingable but it might be not.
I'm curious about what brought this problem into existence in the first place. Why *is* it necessary to contact a random address within the network? (If it's to check that the physical interface is working, then just the fact that you somehow acquired a lease would be enough. no?)
Mantas Mikulėnas
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