On Thu, Apr 22, 2021 at 6:17 PM Bruce A. Johnson < bjohn...@blueridgenetworks.com> 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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