dhcrelay -6 does not work if there are interface aliases up in the system
Hi there,
I've been hit by this issue on Debian stretch through sid (the latest including 4.4.1, I've been unable to test on 4.4.2).
dchrelay -6 doesn't start if there are interface aliases up in the system:
# /usr/sbin/dhcrelay -6 -pf /var/run/dhcrelay6.pid -l vlan.881 -u 2001:db8:cafe::2%vlan.880
Internet Systems Consortium DHCP Relay Agent 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/
Bound to *:547
Listening on Socket/vlan.881:0
Sending on Socket/vlan.881:0
Listening on Socket/vlan.880:0
Sending on Socket/vlan.880:0
Listening on Socket/vlan
Sending on Socket/vlan
setsockopt: IPV6_JOIN_GROUP: Address already in use
If you think you have received this message due to a bug rather
than a configuration issue please read the section on submitting
bugs on either our web page at www.isc.org or in the README file
before submitting a bug. These pages explain the proper
process and the information we find helpful for debugging.
exiting.
The above error can be reproduced with inside a container with the following /etc/network/interfaces:
auto lo
iface lo inet loopback
auto vlan
iface vlan inet dhcp
auto vlan.880
auto vlan.880:0
iface vlan.880 inet static
address 192.168.133.1/24
iface vlan.880 inet6 static
address 2001:db8:cafe::1/64
iface vlan.880:0 inet static
address 10.0.133.1/16
auto vlan.881
auto vlan.881:0
iface vlan.881 inet static
address 192.168.131.1/24
iface vlan.881 inet6 static
address 2001:db8:cafe:1::1/64
iface vlan.881:0 inet static
address 10.1.131.1/16
Just removing (or commenting out) the interface aliases entries makes dchrelay -6 happy (again).
Please note the -l
and -u
filters do not work. But that's another bug.
This seems similar to #88. The patch attached there doesn't fix the problem.