From c5f99af46c1ee905122cbafd7ffffbdf00415cc5 Mon Sep 17 00:00:00 2001
From: DL6ER <dl6er@dl6er.de>
Date: Tue, 3 Jan 2017 18:04:20 +0100
Subject: [PATCH] Detect if IPv6 is used

---
 settings.php | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/settings.php b/settings.php
index 7f5a9ef1..7983e107 100644
--- a/settings.php
+++ b/settings.php
@@ -104,6 +104,17 @@
 		</div>
 <?php
 	// Pi-Hole DHCP server
+
+	// Detect IPv6
+	$usingipv6 = false;
+	if(strlen($piHoleIPv6) > 0 && $piHoleIPv6 != "unknown")
+	{
+		if(substr($piHoleIPv6, 0, 4) != "fe80")
+		{
+			$usingipv6 = true;
+		}
+	}
+
 	if(isset($setupVars["DHCP_ACTIVE"]))
 	{
 		if($setupVars["DHCP_ACTIVE"] == 1)
@@ -138,7 +149,7 @@
 		}
 		else
 		{
-			$DHCPIPv6 = true;
+			$DHCPIPv6 = $usingipv6;
 		}
 
 	}
@@ -158,7 +169,7 @@
 			$DHCProuter = "";
 		}
 		$DHCPleasetime = 24;
-		$DHCPIPv6 = true;
+		$DHCPIPv6 = $usingipv6;
 	}
 	if(isset($setupVars["PIHOLE_DOMAIN"])){
 		$piHoleDomain = $setupVars["PIHOLE_DOMAIN"];