examples: make udhcpc script handle /32 netmasks

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/examples/udhcp/simple.script b/examples/udhcp/simple.script
index 2a917eb6c..e4c1f2d76 100755
--- a/examples/udhcp/simple.script
+++ b/examples/udhcp/simple.script
@@ -29,8 +29,14 @@ case "$1" in
 			metric=0
 			for i in $router ; do
 				echo "Adding router $i"
-				route add default gw $i dev $interface metric $metric
-				: $(( metric += 1 ))
+				if [ "$subnet" = "255.255.255.255" ]; then
+	# special case for /32 subnets:
+	# /32 instructs kernel to always use routing for all outgoing packets
+	# (they can never be sent to local subnet - there is no local subnet for /32).
+	# Used in datacenters, avoids the need for private ip-addresses between two hops.
+					ip route add $i dev $interface
+				fi
+				route add default gw $i dev $interface metric $((metric++))
 			done
 		fi