I don't think it's reasonable for clients to cache responses across disconnect/reconnect, especially when the network has observably changed (new default gatewa

I don't think it's reasonable for clients to cache responses across disconnect/reconnect, especially when the network has observably changed (new default gateway, for example), and even more so when the resolver has changed. Based on my own personal experience I'd also say that no (modern) clients do so although that could be wrong.