aws: Configure MTU to maximum of 9001 on GREEN/ORANGE

AWS supports jumbo-frames which IPFire can take advantage of
to increase network throughput internally.

The MTU for RED was left as 1500 to avoid packet fragmentation
in the cloud network and have IPFire do that job.

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

src/initscripts/helper/aws-setup

@@ -6,6 +6,9 @@
 # Set PATH to find our own executables
 export PATH=/usr/local/sbin:/usr/local/bin:${PATH}
 
+# AWS supports an MTU of up to 9001 bytes
+DEFAULT_MTU=9001
+
 get() {
 	local file="${1}"
 
@@ -167,6 +170,7 @@ import_aws_configuration() {
 					echo "RED_NETMASK=${netmask}"
 					echo "RED_NETADDRESS=${netaddress}"
 					echo "RED_BROADCAST=${broadcast}"
+					echo "RED_MTU=1500"
 					echo "DEFAULT_GATEWAY=${gateway}"
 				) >> /var/ipfire/ethernet/settings
 
@@ -188,6 +192,7 @@ import_aws_configuration() {
 					echo "GREEN_NETMASK=${netmask}"
 					echo "GREEN_NETADDRESS=${netaddress}"
 					echo "GREEN_BROADCAST=${broadcast}"
+					echo "GREEN_MTU=${DEFAULT_MTU}"
 				) >> /var/ipfire/ethernet/settings
 				;;
 
@@ -204,6 +209,7 @@ import_aws_configuration() {
 					echo "ORANGE_NETMASK=${netmask}"
 					echo "ORANGE_NETADDRESS=${netaddress}"
 					echo "ORANGE_BROADCAST=${broadcast}"
+					echo "ORANGE_MTU=${DEFAULT_MTU}"
 				) >> /var/ipfire/ethernet/settings
 				;;
 		esac