[Dnsmasq-discuss] 3 secs dhcp delay

[Harald Dunkel]

Hi Simon,

On 1/17/19 11:58 PM, Simon Kelley wrote:>
 > The delay is while dnsmasq tests the address it's about to allocate in
 > case some host is already using it. It sends a ICMP echo request
 > (essentially a ping) and if it gets a reply, the test fails. After a 3
 > second timeout the test succeeds and the address is allocated. If you're
 > happy that there are no machines using IP addresses without leasing
 > them, or that the similar test that DHCP clients do will find this, then
 > you can disable the check in dnsmasq using the --no-oing config flag.
 >

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?


Regards
Harri