diff --git a/README.md b/README.md
index b97e37f..05dcbbb 100644
--- a/README.md
+++ b/README.md
@@ -16,8 +16,8 @@ One crucial thing to know before starting is the docker-pi-hole container needs
 
 ```
 IMAGE='diginc/pi-hole'
-NIC='eth0'
-IP=$(ip addr show $NIC | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)
+IP_LOOKUP="$(ip route get 8.8.8.8 | awk '{ print $NF; exit }')"  # May not work for VPN / tun0
+IP="${IP:-$IP_LOOKUP}"  # use $IP, if set, otherwise IP_LOOKUP
 docker run -p 53:53/tcp -p 53:53/udp -p 80:80 --cap-add=NET_ADMIN -e ServerIP="$IP" --name pihole -d $IMAGE
 
 # Recommended auto ad list updates & log rotation:
diff --git a/docker_dev.sh b/docker_dev.sh
index 7116bc8..2d3b4a5 100755
--- a/docker_dev.sh
+++ b/docker_dev.sh
@@ -3,7 +3,8 @@ docker build -f alpine.docker -t diginc/pi-hole:alpine .
 docker tag diginc/pi-hole:alpine diginc/pi-hole:latest
 docker build -f debian.docker -t diginc/pi-hole:debian .
 
-IP=$(ip addr show eth0 | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)
+IP_LOOKUP="$(ip route get 8.8.8.8 | awk '{ print $NF; exit }')"  # May not work for VPN / tun0
+IP="${IP:-$IP_LOOKUP}"  # use $IP, if set, otherwise IP_LOOKUP
 
 # Alternative ports to not conflict with my real instance
 # shellcheck disable=SC2068
@@ -15,4 +16,3 @@ docker run -it --rm --cap-add=NET_ADMIN \
   -e VIRTUAL_HOST='pihole.diginc.lan:5080' \
   $@ \
   diginc/pi-hole:"${image:-alpine}"
-
diff --git a/docker_run.sh b/docker_run.sh
index 2a6799c..54ae685 100755
--- a/docker_run.sh
+++ b/docker_run.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 IMAGE=${1:-'diginc/pi-hole:alpine'}
-NIC=${2:-'eth0'}
-IP=$(ip addr show "$NIC" | grep "inet\b" | awk '{print $2}' | cut -d/ -f1)
+IP_LOOKUP="$(ip route get 8.8.8.8 | awk '{ print $NF; exit }')"  # May not work for VPN / tun0
+IP="${IP:-$IP_LOOKUP}"  # use $IP, if set, otherwise IP_LOOKUP
 
 # Default ports + daemonized docker container
 docker run -p 53:53/tcp -p 53:53/udp -p 80:80 \