tested and adapted for Hetzner, DigitalOcean (IPv6) and Linode (IPv4 …

…only) now, mini-fix

install.sh

@@ -593,11 +593,16 @@ function prepare_mn_interfaces() {
         echo "Default interface is down, fallback didn't work. Break here."
         exit 1
     fi
-
-    # DO ipv6 fix, are we on DO?
-    if [[ -z $(grep --quiet "::8888" ${DO_NET_CONF}) ]] && [[ -f ${DO_NET_CONF} ]]; then
-        sed -i '/iface eth0 inet6 static/a dns-nameservers 2001:4860:4860::8844 2001:4860:4860::8888 8.8.8.8 127.0.0.1' ${DO_NET_CONF}
-        ifdown ${ETH_INTERFACE}; ifup ${ETH_INTERFACE};
+
+    # DO ipv6 fix, are we on DO? 
+    # check for DO network config file
+    if [ -f ${DO_NET_CONF} ]; then
+        # found the DO config
+		if ! grep -q "::8888" ${DO_NET_CONF}; then
+			echo "ipv6 fix not found, applying!"
+			sed -i '/iface eth0 inet6 static/a dns-nameservers 2001:4860:4860::8844 2001:4860:4860::8888 8.8.8.8 127.0.0.1' ${DO_NET_CONF}
+			ifdown ${ETH_INTERFACE}; ifup ${ETH_INTERFACE};
+		fi
     fi
 
     IPV6_INT_BASE="$(ip -6 addr show dev ${ETH_INTERFACE} | grep inet6 | awk -F '[ \t]+|/' '{print $3}' | grep -v ^fe80 | grep -v ^::1 | cut -f1-4 -d':' | head -1)" &>> ${SCRIPT_LOGFILE}