diff --git a/build.sh b/build.sh
index dc3c0c4..dbade16 100755
--- a/build.sh
+++ b/build.sh
@@ -7,7 +7,12 @@ KEYFILE="$HOME/.ecdsakey"
 
 set -eu
 
-export GLUON_SITEDIR="$(dirname "$(realpath "$0")")"
+if which realpath > /dev/null; then
+  GLUON_SITEDIR="$(dirname "$(realpath "$0")")"
+else
+  GLUON_SITEDIR="$(dirname "$(readlink -f "$0")")"
+fi
+export GLUON_SITEDIR
 
 get_GLUON_TAG() {
   if ! git --git-dir="${GLUON_DIR}/.git" describe --exact-match; then
diff --git a/site.conf b/site.conf
index 45e1700..e2d95f7 100644
--- a/site.conf
+++ b/site.conf
@@ -3,7 +3,7 @@
 	site_code = 'ffhb',
 
 	prefix4 = '10.196.0.0/17',
-	prefix6 = '2001:bf7:540::/64',
+	prefix6 = '2a06:8782:ffbb:1337::/64',
 
 	timezone = 'CET-1CEST,M3.5.0,M10.5.0/3', -- Europe/Berlin
 	ntp_servers = {
@@ -51,7 +51,7 @@
 
 	next_node = {
 		ip4 = '10.196.0.127',
-		ip6 = '2001:bf7:540::127',
+		ip6 = '2a06:8782:ffbb:1337::127',
 		mac = '16:41:95:40:f7:dc',
 	},
 
@@ -83,8 +83,8 @@
 						remotes = {'ipv4 "vpn05.bremen.freifunk.net" port 10000', 'ipv4 "vpn05.ffhb.de" port 10000'},
 					},
 					vpn06 = {
-						key = '95d907f77128177d073cf7537a81f78bcd6d10fb04cfcda493915944c477fd87',
-						remotes = {'ipv4 "vpn06.bremen.freifunk.net" port 10000', 'ipv6 "vpn06.ffhb.de" port 10000'},
+						key = '99cb85ea2e6346b52abf5eb5ca824f7f037324d4e476f4f068c48b9da98f30e3',
+						remotes = {'ipv4 "vpn06.bremen.freifunk.net" port 10000', 'ipv4 "vpn06.ffhb.de" port 10000'},
 					},
 				},
 			},
@@ -110,13 +110,11 @@
 					'http://downloads.bremen.freifunk.net/firmware/testing/sysupgrade',
 					'http://[2001:bf7:540::c8]/testing/sysupgrade', -- jplitza
 					'http://[2a03:b0c0:3:d0::19:4001]/ffhb-mirror/firmware/testing/sysupgrade', -- janeric
-					'http://[2001:bf7:540::6f]/ffhb-mirror/testing/sysupgrade', -- ec8or
-					'http://[2001:bf7:540::82]/firmware/testing/sysupgrade', -- mortzu
+					'http://[2a06:8782:ffbb:1337::6f]/ffhb-mirror/testing/sysupgrade', -- ec8or
 				},
 				good_signatures = 1,
 				pubkeys = {
 					'c3e3f0486664e4ae692fa8d773038eb7347b8ea1cd1cb670b33eff980ad65d62', -- jplitza
-					'159ff7cdf2646f027bf8f901f8bd950cc3feca9ac13e29b70c57e162f7dafb1f', -- mortzu
 					'5a83733dec4de52c238548194d85b5ff54a92836f7a5a75579f5ddcf8dd90ee8', -- corny
 					'99d180f2e3d5b0844ebbe4a4cee2b305e1d35e3112f0ab09f162c988ffc63131', -- SimJoSt
 					'd22449306f5e592a5554053714e40101c6a7b053acb715504d68ef82fce9ccbe', -- oliver
@@ -131,13 +129,11 @@
 					'http://downloads.bremen.freifunk.net/firmware/stable/sysupgrade',
 					'http://[2001:bf7:540::c8]/stable/sysupgrade', -- jplitza
 					'http://[2a03:b0c0:3:d0::19:4001]/ffhb-mirror/firmware/stable/sysupgrade', -- janeric
-					'http://[2001:bf7:540::6f]/ffhb-mirror/stable/sysupgrade', -- ec8or
-					'http://[2001:bf7:540::82]/firmware/stable/sysupgrade', -- mortzu
+					'http://[2a06:8782:ffbb:1337::6f]/ffhb-mirror/stable/sysupgrade', -- ec8or
 				},
 				good_signatures = 2,
 				pubkeys = {
 					'c3e3f0486664e4ae692fa8d773038eb7347b8ea1cd1cb670b33eff980ad65d62', -- jplitza
-					'159ff7cdf2646f027bf8f901f8bd950cc3feca9ac13e29b70c57e162f7dafb1f', -- mortzu
 					'5a83733dec4de52c238548194d85b5ff54a92836f7a5a75579f5ddcf8dd90ee8', -- corny
 					'99d180f2e3d5b0844ebbe4a4cee2b305e1d35e3112f0ab09f162c988ffc63131', -- SimJoSt
 					'd22449306f5e592a5554053714e40101c6a7b053acb715504d68ef82fce9ccbe', -- oliver