From 9b3dfbf65231bfb5b82b315a10f2d1b2428d655b Mon Sep 17 00:00:00 2001
From: Manevolent <Manevolent@users.noreply.github.com>
Date: Wed, 12 Apr 2023 22:28:42 -0600
Subject: [PATCH] Update subnet-up.tmpl

---
 tinc/subnet-up.tmpl | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tinc/subnet-up.tmpl b/tinc/subnet-up.tmpl
index 866536d..a64840c 100644
--- a/tinc/subnet-up.tmpl
+++ b/tinc/subnet-up.tmpl
@@ -1,2 +1,12 @@
 #!/bin/ash
 echo "Route up: \$SUBNET weight \$WEIGHT via \$NODE (\$REMOTEADDRESS:\$REMOTEPORT)"
+nonMACChars=`echo \$SUBNET | tr -d "[:digit:]" | tr -d [:ABCDEF]`
+macFile="/tmp/tinc_peer_mac_\$NODE"
+if [ -z "\$nonMACChars" ]; then
+  # This subnet is a MAC
+  echo "\$SUBNET" > \$macFile
+else
+  # This subnet is likely an IP address, add it to the ARP table
+  mac=`cat \$macFile`
+  arp -s "\$SUBNET" "\$mac"
+fi