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| author | Denys Vlasenko | 2017-04-06 00:53:43 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2017-04-06 00:53:43 +0200 |
| commit | 9c192e7f946a351c811e2278bbf56b4dc6a4b663 (patch) | |
| tree | f5692f4976dbb828858545dc6990c70658429d37 /examples/udhcp/sample.renew | |
| parent | 19578b4edf84927705cab33b9e3d39645461c69b (diff) | |
| download | busybox-9c192e7f946a351c811e2278bbf56b4dc6a4b663.zip busybox-9c192e7f946a351c811e2278bbf56b4dc6a4b663.tar.gz | |
examples: make udhcpc script handle /32 netmasks
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'examples/udhcp/sample.renew')
| -rwxr-xr-x | examples/udhcp/sample.renew | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/examples/udhcp/sample.renew b/examples/udhcp/sample.renew index 4dce848..efd98cf 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 |