[Config: CC]

There is one host on my DHCP network that is receiving DHCPDECLINE every two weeks or so.  The host is renewing its lease every 4 hours (or so), so it is working most of the time.

For example, here is the start of a DECLINE and OFFER new address:

Sun Jul 10 08:44:08 2016 daemon.info dnsmasq-dhcp[1539]: DHCPREQUEST(br-lan) {net}.173 {mac}
Sun Jul 10 08:44:08 2016 daemon.info dnsmasq-dhcp[1539]: DHCPACK(br-lan) {net}.173 {mac} {host}
# 30 seconds later, DHCPDECLINE
Sun Jul 10 08:44:36 2016 daemon.info dnsmasq-dhcp[1539]: DHCPDECLINE(br-lan) {net}.173 {mac}
Sun Jul 10 08:44:49 2016 daemon.info dnsmasq-dhcp[1539]: DHCPDISCOVER(br-lan) {mac}
# changed from 173 to 174
Sun Jul 10 08:44:49 2016 daemon.info dnsmasq-dhcp[1539]: DHCPOFFER(br-lan) {net}.174 {mac}
Sun Jul 10 08:44:49 2016 daemon.info dnsmasq-dhcp[1539]: DHCPDISCOVER(br-lan) {mac}
Sun Jul 10 08:44:49 2016 daemon.info dnsmasq-dhcp[1539]: DHCPOFFER(br-lan) {net}.174 {mac}
Sun Jul 10 08:44:50 2016 daemon.info dnsmasq-dhcp[1539]: DHCPREQUEST(br-lan) {net}.174 {mac}
Sun Jul 10 08:44:50 2016 daemon.info dnsmasq-dhcp[1539]: DHCPACK(br-lan) {net}.174 {mac} {host}

Every few hours, for 21 days:

<repeat>
Mon Jul 11 07:40:27 2016 daemon.info dnsmasq-dhcp[1539]: DHCPREQUEST(br-lan) {net}.174 {mac}
Mon Jul 11 07:40:27 2016 daemon.info dnsmasq-dhcp[1539]: DHCPACK(br-lan) {net}.174 {mac} {host}
</repeat>

Then, DHCPDECLINE, but same address:

Sun Jul 31 20:00:45 2016 daemon.info dnsmasq-dhcp[16256]: DHCPREQUEST(br-lan) {net}.174 {mac}
Sun Jul 31 20:00:45 2016 daemon.info dnsmasq-dhcp[16256]: DHCPACK(br-lan) {net}.174 {mac} {host}
Sun Jul 31 20:01:20 2016 daemon.info dnsmasq-dhcp[16256]: DHCPDECLINE(br-lan) {net}.174 {mac}
Sun Jul 31 20:01:33 2016 daemon.info dnsmasq-dhcp[16256]: DHCPDISCOVER(br-lan) {mac}

Then, renewal every few hours for 8 days. After 8 days, DHCPDECLINE and OFFER new address:

Mon Aug 8 19:45:32 2016 daemon.info dnsmasq-dhcp[16256]: DHCPREQUEST(br-lan) {net}.174 {mac}
Mon Aug 8 19:45:32 2016 daemon.info dnsmasq-dhcp[16256]: DHCPACK(br-lan) {net}.174 {mac} {host}
# 35 seconds later, DHCPDECLINE
Mon Aug 8 19:46:07 2016 daemon.info dnsmasq-dhcp[16256]: DHCPDECLINE(br-lan) {net}.174 {mac}
Mon Aug 8 19:46:20 2016 daemon.info dnsmasq-dhcp[16256]: DHCPDISCOVER(br-lan) {mac}
Mon Aug 8 19:46:20 2016 daemon.info dnsmasq-dhcp[16256]: DHCPOFFER(br-lan) {net}.175 {mac}
Mon Aug 8 19:46:20 2016 daemon.info dnsmasq-dhcp[16256]: DHCPDISCOVER(br-lan) {mac}
Mon Aug 8 19:46:20 2016 daemon.info dnsmasq-dhcp[16256]: DHCPOFFER(br-lan) {net}.175 {mac}
Mon Aug 8 19:46:21 2016 daemon.info dnsmasq-dhcp[16256]: DHCPREQUEST(br-lan) {net}.175 {mac}
Mon Aug 8 19:46:21 2016 daemon.info dnsmasq-dhcp[16256]: DHCPACK(br-lan) {net}.175 {mac} {host}

Why would dnsmasq send an unsolicited DHCPDECLINE? Also, it only seems to be affecting one host.

--
-Justin
[email protected]

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