fix: Gateway MAC generation (#910)

Dockerfile

@@ -37,6 +37,7 @@ RUN set -eu && extra="" && \
         net-tools \
         e2fsprogs \
         qemu-utils \
+        iputils-ping \
         ca-certificates \
         netcat-openbsd \
         qemu-system-x86 \

src/network.sh

@@ -4,6 +4,7 @@ set -Eeuo pipefail
 # Docker environment variables
 
 : "${MAC:=""}"
+: "${MTU:=""}"
 : "${DHCP:="N"}"
 : "${NETWORK:="Y"}"
 : "${USER_PORTS:=""}"
@@ -58,6 +59,10 @@ configureDHCP() {
       fi ;;
   esac
 
+  if ! ip link set dev "$VM_NET_TAP" mtu "$MTU"; then
+    warn "Failed to set MTU size.."
+  fi
+
   while ! ip link set "$VM_NET_TAP" up; do
     info "Waiting for MAC address $VM_NET_MAC to become available..."
     sleep 2
@@ -213,8 +218,11 @@ configureNAT() {
     error "$tuntap" && return 1
   fi
 
-  GATEWAY_MAC=$(echo "$VM_NET_MAC" | rev)
+  if ! ip link set dev "$VM_NET_TAP" mtu "$MTU"; then
-  GATEWAY_MAC="02:${GATEWAY_MAC:0:14}"
+    warn "Failed to set MTU size.."
+  fi
+
+  GATEWAY_MAC=$(echo "$VM_NET_MAC" | md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\).*$/02:\1:\2:\3:\4:\5/')
 
   if ! ip link set dev "$VM_NET_TAP" address "$GATEWAY_MAC"; then
     warn "Failed to set gateway MAC address.."
@@ -345,6 +353,10 @@ getInfo() {
     error "$ADD_ERR -e \"VM_NET_DEV=NAME\" to specify another interface name." && exit 27
   fi
 
+  if [ -z "$MTU" ]; then
+    MTU=$(cat "/sys/class/net/$VM_NET_DEV/mtu")
+  fi
+
   if [ -z "$VM_NET_MAC" ]; then
     local file="$STORAGE/dsm.mac"
     [ -s "$file" ] && VM_NET_MAC=$(<"$file")
@@ -387,7 +399,7 @@ getInfo
 html "Initializing network..."
 
 if [[ "$DEBUG" == [Yy1]* ]]; then
-  info "Host: $HOST  IP: $IP  Gateway: $GATEWAY  Interface: $VM_NET_DEV  MAC: $VM_NET_MAC"
+  info "Host: $HOST  IP: $IP  Gateway: $GATEWAY  Interface: $VM_NET_DEV  MAC: $VM_NET_MAC  MTU: $MTU"
   [ -f /etc/resolv.conf ] && grep '^nameserver*' /etc/resolv.conf
   echo
 fi
@@ -452,6 +464,6 @@ else
 
 fi
 
-NET_OPTS+=" -device $ADAPTER,romfile=,netdev=hostnet0,mac=$VM_NET_MAC,id=net0"
+NET_OPTS+=" -device $ADAPTER,romfile=,netdev=hostnet0,mac=$VM_NET_MAC,host_mtu=$MTU,id=net0"
 
 return 0