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How do I disable automatic IP address updating (when conflict is detected with ISP)?
I use a non-routing range on my LAN and use static IP addresses for certain hosts. The automatic change accompanied by: Important Update To avoid conflict with your Internet Service Provider,...
You may not like the automatic changing of IP addresses, but the behavior is a sign that your LAN and WAN subnets conflict with each other. I don't know how your other router was able to work correctly with such a conflict, but you should fix it. For example, if your ISP is using subnet 192.168.1.0/255.255.255.0, then set your LAN to use 192.168.2.0/255.255.255.0. Problem solved.
Netgear made this change almost 2 years ago. You could try a older FW version.
You may not like the automatic changing of IP addresses, but the behavior is a sign that your LAN and WAN subnets conflict with each other. I don't know how your other router was able to work correctly with such a conflict, but you should fix it. For example, if your ISP is using subnet 192.168.1.0/255.255.255.0, then set your LAN to use 192.168.2.0/255.255.255.0. Problem solved.