On 21/01/2019 08:59, Harald Dunkel wrote:
> On 1/18/19 10:36 AM, Harald Dunkel wrote:
>> Do you think dnsmasq could watch/ping its IP address range while it is
>> idle, caching the result? It might examine the local arp table as well:
>> If there is an entry with matching MAC and IP address, isn't it
>> reasonable
>> to assume that the IP address is not in use somewhere else?
> PS: I found https://tools.ietf.org/html/rfc5227 on the web. Interesting
> read, but probably it won't help to avoid the delay.

RFC5227 is an elaboration of the ARP-based method.

Using ARP probes works at the client, but it's never applicable for the
server, because the server may not be located in the same
broadcast-domain as the client(s). Using DHCP relay, the server can be
on another subnet entirely. This is why servers use ICMP for conflict
detection, as it's a routable protocol.



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