From 15acbad935feff843b201b3379c744173a588441 Mon Sep 17 00:00:00 2001
From: Giulio Cervera <giulio.cervera@dxc.com>
Date: Mon, 27 Aug 2018 15:11:15 +0200
Subject: [PATCH] interfaces: get pfsync0 mtu from real interface

in some situation, like OpenStack, mtu is less then default (1500) and
it cause replication issue
we have noticed on a low used firewall with 2/3k State table size more
then 100k State table size on the backup server

copy mtu from real interface fix this issue
---
 src/etc/inc/interfaces.inc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/etc/inc/interfaces.inc b/src/etc/inc/interfaces.inc
index c7ddee158..5a6338262 100644
--- a/src/etc/inc/interfaces.inc
+++ b/src/etc/inc/interfaces.inc
@@ -1525,6 +1525,8 @@ function interfaces_carp_setup($verbose = false)
 {
     global $config;
 
+    $intf_stats = legacy_interfaces_details();
+
     if ($verbose) {
         echo 'Configuring CARP settings...';
         flush();
@@ -1542,6 +1544,7 @@ function interfaces_carp_setup($verbose = false)
         }
 
         mwexec("/sbin/ifconfig pfsync0 syncdev {$carp_sync_int} {$syncpeer} up", false);
+        mwexec("/sbin/ifconfig pfsync0 mtu {$intf_stats[$carp_sync_int]['mtu']}", false);
     } else {
         mwexec("/sbin/ifconfig pfsync0 -syncdev -syncpeer down", false);
     }