Has this ever been fixed? This is pretty nasty, and brings down the
whole Docker swarm cluster.
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Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu.
https://bugs.launchpad.net/bugs/1670303
Title:
dhcpd does
IMHO this is an important bug because it randomly interferes with other
applications - lots of which use defined ports above 1024.
My recent case caused an OpenVPN instance to fail to start. More
seriously it created a security risk since the port in question was of
course open on the firewall
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: isc-dhcp (Ubuntu)
Status: New => Confirmed
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WORKAROUND: if the other application which needs to bind to a UDP port
can be configured to bind to a specific interface, then you can make
isc-dhcp-server bind to a different interface in dhcpd.conf. e.g.
ddns-local-address4 127.0.0.1;
ddns-local-address6 ::1;
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strace shows that dhcpd is binding to explicit ports which it has chosen
itself:
setsockopt(20, SOL_SOCKET, SO_TIMESTAMP, [1], 4) = 0
setsockopt(20, SOL_IP, IP_MTU_DISCOVER, [0], 4) = 0
getsockopt(20, SOL_SOCKET, SO_RCVBUF, [212992], [4]) = 0
setsockopt(20, SOL_IP, IP_RECVTOS, [1], 4) = 0
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