include a better solution to fetch external ip

installer/bin/myip.sh

@@ -0,0 +1,96 @@
+#!/bin/bash
+
+## Get my external IP
+
+timeout=2   # seconds to wait for a reply before trying next server
+verbose=1   # prints which server was used to STDERR
+
+dnslist=(
+    "dig +short            myip.opendns.com        @resolver1.opendns.com"
+    "dig +short            myip.opendns.com        @resolver2.opendns.com"
+    "dig +short            myip.opendns.com        @resolver3.opendns.com"
+    "dig +short            myip.opendns.com        @resolver4.opendns.com"
+    "dig +short    -t txt  o-o.myaddr.l.google.com @ns1.google.com"
+    "dig +short -4 -t a    whoami.akamai.net       @ns1-1.akamaitech.net"
+    "dig +short            whoami.akamai.net       @ns1-1.akamaitech.net"
+)
+
+httplist=(
+    4.ifcfg.me
+    alma.ch/myip.cgi
+    api.infoip.io/ip
+    api.ipify.org
+    bot.whatismyipaddress.com
+    canhazip.com
+    checkip.amazonaws.com
+    eth0.me
+    icanhazip.com
+    ident.me
+    ipecho.net/plain
+    ipinfo.io/ip
+    ipof.in/txt
+    ip.tyk.nu
+    l2.io/ip
+    smart-ip.net/myip
+    tnx.nl/ip
+    wgetip.com
+    whatismyip.akamai.com
+)
+
+
+
+# function to shuffle the global array "array"
+shuffle() {
+   local i tmp size max rand
+   size=${#array[*]}
+   max=$(( 32768 / size * size ))
+   for ((i=size-1; i>0; i--)); do
+      while (( (rand=$RANDOM) >= max )); do :; done
+      rand=$(( rand % (i+1) ))
+      tmp=${array[i]} array[i]=${array[rand]} array[rand]=$tmp
+   done
+}
+
+
+# if we have dig and a list of dns methods, try that first
+if hash dig 2>/dev/null && [ ${#dnslist[*]} -gt 0 ]; then
+    eval array=( \"\${dnslist[@]}\" )
+    shuffle
+
+    for cmd in "${array[@]}"; do
+        [ "$verbose" == 1 ] && echo Trying: $cmd 1>&2
+        ip=$(timeout $timeout $cmd)
+        if [ -n "$ip" ]; then
+            echo $ip
+            exit
+        fi
+    done
+fi
+
+
+# if we haven't succeeded with DNS, try HTTP
+
+if [ ${#httplist[*]} == 0 ]; then
+    echo "No hosts in httplist array!" >&2
+    exit 1
+fi
+
+# use curl or wget, depending on which one we find
+curl_or_wget=$(if hash curl 2>/dev/null; then echo curl; elif hash wget 2>/dev/null; then echo "wget -qO-"; fi);
+
+if [ -z "$curl_or_wget" ]; then
+    echo "Neither curl nor wget found. Cannot use http method." >&2
+    exit 1
+fi
+
+eval array=( \"\${httplist[@]}\" )
+shuffle
+
+for url in "${array[@]}"; do
+    [ "$verbose" == 1 ] && echo Trying: $curl_or_wget -s "$url" 1>&2
+    ip=$(timeout $timeout $curl_or_wget -s "$url")
+    if [ -n "$ip" ]; then
+        echo $ip
+        exit
+    fi
+done

installer/etc/rc.local

@@ -2,8 +2,7 @@
 # Let's add the first local ip to the /etc/issue and external ip to ews.ip file
 source /etc/environment
 myLOCALIP=$(hostname -I | awk '{ print $1 }')
-#myEXTIP=$(dig +short myip.opendns.com @resolver1.opendns.com)
+myEXTIP=$(/usr/bin/myip.sh)
-myEXTIP=$(curl -s whatismyip.akamai.com)
 sed -i "s#IP:.*#IP: $myLOCALIP ($myEXTIP)#" /etc/issue
 sed -i "s#SSH:.*#SSH: ssh -l tsec -p 64295 $myLOCALIP#" /etc/issue
 sed -i "s#WEB:.*#WEB: https://$myLOCALIP:64297#" /etc/issue