On 25.09.20 10:17, Tuxo wrote:
I'm trying to find better ways to reclaim all active dhcp leases on my
local subnet after my home router running dnsmasq occasionally has to
reboot.
why the need to reclaim them?
Usually after a reboot the lease file set with dhcp-leasefile= is
empty and will remain empty until the client renews or rebinds it's
lease (T1 lease and T2 lease time).
that's because the lease file is stored in /tmp , which resides on transient
filesystem on most routers, The filesystem gets empty and dhcp server has no
idea who used what IPs before.
I thought the dhcp-authoritative could be of help here, but that seems
not to be the case for the dhcp-leasefile: it stays empty until the
client does renew or rebind it's lease.
So my clumsy fix for the matter was a short lease time of 1h to make
sure it would renew the lease after 30 minutes (T1 time) upon my
router reboots.
I'd like to improve the server configuration, but don't know what else
to try.
I give home machines static IPs (using /etc/ethers and /etc/hosts) outside
of dynamic range. That way they aren't in lease file after reboot, but it's
much more likely to avoid collisions.
So without further ado here's my /etc/dnsmasq.conf file as it stands:
listen-address=127.0.0.1
listen-address=192.168.10.1
interface=br0
dhcp-leasefile=/tmp/dnsmasq.leases
dhcp-lease-max=20
dhcp-range=192.168.10.10,192.168.10.90,255.255.255.0,1h
dhcp-option=3,192.168.10.1
dhcp-authoritative
log-dhcp
domain=MyDomain
no-resolv
stop-dns-rebind
server=my.dns.provider.ip
--
Matus UHLAR - fantomas, [email protected] ; http://www.fantomas.sk/
Warning: I wish NOT to receive e-mail advertising to this address.
Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu postu.
My mind is like a steel trap - rusty and illegal in 37 states.
_______________________________________________
Dnsmasq-discuss mailing list
[email protected]
http://lists.thekelleys.org.uk/mailman/listinfo/dnsmasq-discuss
