Differences

This shows you the differences between two versions of the page.

--- networking:ziggo:changed-ip [2024/09/13 06:42] – oscar
+++ networking:ziggo:changed-ip [2025/09/04 16:03] (current) – [IPv6 change] oscar
@@ Line 8: / Line 8: @@
   - On the router update: network/firewall/traffic rules --> Allow-HTTPS-ipv6 to new address of webserver
+Note that the routers IPv6 WAN address is different / outside of the Prefix Delegation (PD) range!
 ===== IPv4 change =====
 When Ziggo change our IPv4 address. The following steps are required:
@@ Line 14: / Line 15: @@
   - Update the TransIP A record with the new IP of the webserver
+====== Monitor ======
+On the main OpenWRT router a script is running to monitor changed IP addresses. It compares the IPV4 and IPv6 address between:
+  * DNS as registered at TransIP with: nslookup -type=a  oscardegroot.nl ns0.transip.net
+  * IP address as observed by external websites, with: wget -4 --quiet -O - https://www.transip.nl/ip-check/
+===== OpenWRT prerequisites =====
+For sending notification email install the following package on the router:
+  mailsend
+===== ip-change-detect.sh =====
+The following script is created on main OpenWRT router:
+<code>
+# nano /root/ip-change-detect.sh
+------------------------------------
+#!/bin/sh
+#
+# OdG  13/09/2024
+#
+DNS_1="192.168.178.1"    # Use router DNSMasq as DNS server
+DNS_2="192.168.178.83"   # Use mailserver unbound as DNS server
+DNS_3="ns0.transip.net"  # Use TransIP DNS server
+STATUS_V4="OK"
+STATUS_V6="OK"
+MAIL_FILE="/tmp/ip-mail-body.txt"
+MAIL_HEADER=">> IP CHANGE DETECTED <<"
+# Get the IPv4 DNS registrations & currenty used IP
+IP4_DNS=$(nslookup -type=a  oscardegroot.nl ${DNS_3} | awk '/^Address: / { print $2 }')
+RESPONSE=$(wget -4 --quiet -O - https://www.transip.nl/ip-check/)
+RESPONSE=${RESPONSE:19:16}
+IP4_1=$(echo $RESPONSE | cut -d . -f 1 )
+IP4_2=$(echo $RESPONSE | cut -d . -f 2 )
+IP4_3=$(echo $RESPONSE | cut -d . -f 3 )
+IP4_4=$(echo $RESPONSE | cut -d . -f 4 )
+IP4_CURRENT=$IP4_1"."$IP4_2"."$IP4_3"."$IP4_4
+# Get the IPv6 DNS registrations & currenty used IP
+RESPONSE=$(nslookup -type=aaaa  oscardegroot.nl ${DNS_3} | awk '/^Address: / { print $2 }')
+IP6_DNS=${RESPONSE:0:14}
+RESPONSE==$(wget -6 --quiet -O - https://www.transip.nl/ip-check/)
+IP6_CURRENT=${RESPONSE:20:14}
+if [[ $IP4_DNS != $IP4_CURRENT ]] ; then
+       STATUS_V4="ERROR"
+fi
+if [[ $IP6_DNS != $IP6_CURRENT ]] ; then
+        STATUS_V6="ERROR"
+fi
+#if [[ $STATUS_V4 == "ERROR" || $STATUS_V6 == "ERROR" ]] ; then
+if [[ 1 ]] ; then
+        echo "-------- IPv4 --------" > $MAIL_FILE
+        echo "STATUS  :"$STATUS_V4    >> $MAIL_FILE
+        echo "DNS     :"$IP4_DNS      >> $MAIL_FILE
+        echo "CURRENT :"$IP4_CURRENT  >> $MAIL_FILE
+        echo "" >> $MAIL_FILE
+        echo "-------- IPv6 --------" >> $MAIL_FILE
+        echo "STATUS  :"$STATUS_V6    >> $MAIL_FILE
+        echo "DNS     :"$IP6_DNS      >> $MAIL_FILE
+        echo "CURRENT :"$IP6_CURRENT  >> $MAIL_FILE
+        mailsend -f root@openwrt -t oscar@oscardegroot.nl -smtp 192.168.178.83 -sub "$MAIL_HEADER" -cs "utf-8" -mime-type "text/plain" -msg-body "$MAIL_FILE"
+        rm $MAIL_FILE
+fi
+exit 0
+</code>
+===== Crontab Scheduling =====
+Add the following line via the OpenWRT GUI (System/Scheduled tasks) or to the **/etc/crontabs/root** file:
+0-23/3 * * * /root/ip-change-detect.sh
+This runs the check every 3 hours between 0-23 hours every day