# To avoid UDP checksum problems.
installDebianPackage ${prefix} ethtool
-sed -i'' -e 's/^exit 0$/ethtool -K eth0 tx off\n\0/' ${prefix}/etc/rc.local
+if ! sed -i -e 's/^\(\s*\)#\s*post-up\s\+ethtool/\1post-up ethtool -K eth0 tso off\n\0/' ${prefix}/etc/network/interfaces; then
+ echo "ERROR: unable to disable network segmentation offloading"
+ exit 1
+fi
#
# Log our finish