From fae14f4dd9e8089a6294549429b86de6a76d46fe Mon Sep 17 00:00:00 2001
From: Kroese <kroese@users.noreply.github.com>
Date: Thu, 9 Oct 2025 11:48:08 +0200
Subject: [PATCH] feat: Set listening interface for Passt (#1052)

---
 src/network.sh | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/network.sh b/src/network.sh
index 936a1b4..d39d7de 100644
--- a/src/network.sh
+++ b/src/network.sh
@@ -20,6 +20,7 @@ set -Eeuo pipefail
 : "${VM_NET_MASK:="255.255.255.0"}"
 
 : "${PASST:="passt"}"
+: "${PASST_MTU:=""}"
 : "${PASST_OPTS:=""}"
 : "${PASST_DEBUG:=""}"
 
@@ -295,13 +296,14 @@ configurePasst() {
   PASST_OPTS+=" -a $ip"
   PASST_OPTS+=" -g $gateway"
   PASST_OPTS+=" -n $VM_NET_MASK"
+  [ -n "$PASST_MTU" ] && PASST_OPTS+=" -m $PASST_MTU"
 
   exclude=$(getHostPorts "$HOST_PORTS")
 
   if [ -z "$exclude" ]; then
-    exclude="all"
+    exclude="%${VM_NET_DEV}/all"
   else
-    exclude="~${exclude//,/,~}"
+    exclude="%${VM_NET_DEV}/~${exclude//,/,~}"
   fi
 
   PASST_OPTS+=" -t $exclude"