done
## Fill in the black holes in the network. Some of these might actually be
-## known networks, so don't fill those in again. See RFC5735 or its
-## successors.
+## known networks, so don't fill those in again. See RFC5735 and RFC4291,
+## and their successors.
for addr in \
10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 \
127.0.0.0/8 \
done
for addr in \
fc00::/7 \
+ ::0:0/96 ::ffff:0:0/96 \
2001:db8::/32
do
case $alladdrs in *!$addr!*) continue ;; esac