DATAPUISTOKEMISTI

# Install tftpd-hpa package apt-get update apt-get -y install tftpd-hpa # Fix config file broken by default # - use correct tftpboot directory rather than random location under /var # - chroot to tftpboot # - allow uploading of files but not overwriting existing # - listen IPv4 and IPv6 instead of IPv6 only # - enable logging mv /etc/default/tftpd-hpa /etc/default/tftpd-hpa.old cat <<'__EOF__' >/etc/default/tftpd-hpa TFTP_USERNAME="tftp"  TFTP_DIRECTORY="/tftpboot"  TFTP_ADDRESS=":69" TFTP_OPTIONS="--secure --create --listen --verbose" __EOF__ # Create tftpboot directory and use proper permissions mkdir /tftpboot chmod -R 1770 /tftpboot  chown -R root:tftp /tftpboot # Restart service service tftpd-hpa restart P.S. There's config file bug causing tftpd to listen only IPv6 connections by default... https://bugs.launchpad.net/ubuntu/+source/tftp-hpa/+bug/1448500

Sonera recently started offering 6rd tunnels to their customers in Finland. Based on this Comcast example it was easy to get Sonera 6rd up with Cisco 892 running IOS 15.5(1)T.

To prefer IPv4 (A) addresses over IPv6 (AAAA) on CentOS 6 you need to add new file named /etc/gai.conf with following content. Last line is what controls if IPv4 or IPv6 should be tried first.

# dnsmasq --version Dnsmasq version 2.68 Copyright (c) 2000-2013 Simon Kelley Compile time options: IPv6 GNU-getopt DBus i18n IDN DHCP DHCPv6 no-Lua TFTP conntrack ipset auth # md5sum dnsmasq* 8a704b6aa977df9485b3faf940cc5e35 dnsmasq_2.68-1_all.deb 60bafb9b863671bb02595505a447270c dnsmasq-base_2.68-1_amd64.deb There was odd " [icmp6 sum ok] ICMP6, destination unreachable, unreachable port " going out from my server every time DNS reply was received. Turns out it was because dnsmasq IPv6 support is buggy .