dnsmasq's TFTP does not bind to DHCP'd interfaces

[Michał Sawicz]

Having enabled tftp in dnsmasq:

 cat /etc/dnsmasq.d/tftp
enable-tftp=lo,em1
tftp-root=/var/tftp

On boot, it only binds on localhost:

 sudo netstat -anp | grep dnsmasq
udp 0 0 127.0.0.1:69 0.0.0.0:* 1946/dnsmasq
udp6 0 0 ::1:69 :::* 1946/dnsmasq

This is likely due to my em1 interface being configured via DHCP, as restarting dnsmasq gets it to bind to it again:

 sudo netstat -anp | grep dnsmasq
udp 0 0 127.0.0.1:69 0.0.0.0:* 12250/dnsmasq
udp 0 0 10.0.1.100:69 0.0.0.0:* 12250/dnsmasq
udp6 0 0 ::1:69 :::* 12250/dnsmasq
udp6 0 0 fe80:::::: :::* 12250/dnsmasq

Should dnsmasq only start after the network got configured? Or do I need to add an explicit dependency in my dnsmasq unit?

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: dnsmasq 2.75-1ubuntu0.16.04.1
ProcVersionSignature: Ubuntu 4.4.0-72.93-generic 4.4.49
Uname: Linux 4.4.0-72-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.20.1-0ubuntu2.5
Architecture: amd64
Date: Thu Apr 13 15:50:24 2017
PackageArchitecture: all
SourcePackage: dnsmasq
UpgradeStatus: Upgraded to xenial on 2016-10-28 (167 days ago)

[Joshua Powers (powersj)]

Hi, I am marking this as a dup of LP: #1531184 as this sounds a lot like the same issue and could be resolved in the same manner. If I have misunderstood or overlooked something please feel free to add details here. Thanks!