diff --git a/Dockerfile b/Dockerfile
index 402ecc8..9a75357 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -21,6 +21,7 @@ RUN apt-get -y install \
         php-cgi \
         php-curl \
 		sudo \
+		iproute2 \
 		&& apt-get -y clean
 
 RUN cd /tmp && \
diff --git a/files/runScanner.sh b/files/runScanner.sh
index a0ccef3..0f1002b 100755
--- a/files/runScanner.sh
+++ b/files/runScanner.sh
@@ -13,6 +13,11 @@ touch /var/log/scanner.log
 chown $USERNAME /var/log/scanner.log
 env > /opt/brother/scanner/env.txt
 chmod -R 777 /opt/brother
+
+subnet=$(echo $IPADDRESS | sed 's/\([0-9]*\.[0-9]*\.\)[0-9]*\.[0-9]*/\1/')
+interface=$(ip addr show | grep -B10 $subnet | grep mtu | tail -1 | sed 's/[0-9]*: \(.*\): .*/\1/')
+echo "eth=$interface\n" >> /opt/brother/scanner/brscan-skey/brscan-skey.config
+
 su - $USERNAME -c "/usr/bin/brsaneconfig4 -a name=$NAME model=$MODEL ip=$IPADDRESS"
 su - $USERNAME -c "/usr/bin/brscan-skey"