#!/bin/sh
-# Sample udhcpc bound script
+# Sample udhcpc renew script
RESOLV_CONF="/etc/udhcpc/resolv.conf"
metric=0
for i in $router
do
+ if [ "$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.
+ /sbin/ip route add $i dev $interface
+ fi
/sbin/route add default gw $i dev $interface metric $((metric++))
done
fi
-echo -n > $RESOLV_CONF
-[ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
-for i in $dns
-do
- echo adding dns $i
- echo nameserver $i >> $RESOLV_CONF
-done
+# Only replace resolv.conf if we have at least one DNS server
+if [ -n "$dns" ]
+then
+ echo -n > $RESOLV_CONF
+ [ -n "$domain" ] && echo domain $domain >> $RESOLV_CONF
+ for i in $dns
+ do
+ echo adding dns $i
+ echo nameserver $i >> $RESOLV_CONF
+ done
+fi