From 9c192e7f946a351c811e2278bbf56b4dc6a4b663 Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 6 Apr 2017 00:53:43 +0200 Subject: examples: make udhcpc script handle /32 netmasks Signed-off-by: Denys Vlasenko --- examples/udhcp/sample.renew | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) (limited to 'examples/udhcp/sample.renew') diff --git a/examples/udhcp/sample.renew b/examples/udhcp/sample.renew index 4dce8486a..efd98cf15 100755 --- a/examples/udhcp/sample.renew +++ b/examples/udhcp/sample.renew @@ -1,5 +1,5 @@ #!/bin/sh -# Sample udhcpc bound script +# Sample udhcpc renew script RESOLV_CONF="/etc/udhcpc/resolv.conf" @@ -18,11 +18,18 @@ then 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 $((metric++)) done fi -# Only replace resolv.conf is we have at least one DNS server +# Only replace resolv.conf if we have at least one DNS server if [ -n "$dns" ] then echo -n > $RESOLV_CONF -- cgit v1.2.3