IPv6 addrconf: prefix with wrong length 48
February 15th, 2010
If your hosting provider gives out an entire /48 for every hosted server, your syslog may get overwhelmed with messages concerning the subnet mask:
1 Time(s): [705959.619704] IPv6 addrconf: prefix with wrong length 48
To solve this temporarily you can disable auto-configuration and router advertisements:
echo 0 > /proc/sys/net/ipv6/conf/eth0/accept_ra echo 0 > /proc/sys/net/ipv6/conf/eth0/autoconf
This seems to suppress the annoying log messages on my Ubuntu based environment. If you would like to make this persistent through reboots, add the following lines to /etc/sysctl.conf:
net.ipv6.conf.all.accept_ra = 0 net.ipv6.conf.all.autoconf = 0