From 8d4b63d3063e7a6757f75bc4d2ba2c462b774fd9 Mon Sep 17 00:00:00 2001
From: Franco Fichtner <franco@opnsense.org>
Date: Tue, 19 Jul 2022 11:26:31 +0200
Subject: [PATCH] system: Net_IPv6::compress() should not compress "::" to ""

---
 src/etc/inc/IPv6.inc | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/etc/inc/IPv6.inc b/src/etc/inc/IPv6.inc
index ac85b218e..273495b74 100644
--- a/src/etc/inc/IPv6.inc
+++ b/src/etc/inc/IPv6.inc
@@ -589,8 +589,10 @@ class Net_IPv6
             $cip = preg_replace('/' . $match . '/', ':', $cip, 1);
         }
 
-        $cip = preg_replace('/((^:)|(:$))/', '', $cip);
-        $cip = preg_replace('/((^:)|(:$))/', '::', $cip);
+        if ($cip != '::') {
+            $cip = preg_replace('/((^:)|(:$))/', '', $cip);
+            $cip = preg_replace('/((^:)|(:$))/', '::', $cip);
+        }
 
         if ('' != $netmask) {
             $cip = $cip . '/' . $netmask;