If someone knows what is your IP address of WAN link, if someone knows what ISP you are currently using, if someone knows where your link is connected, isn’t that scary ? Of course, that is definitely "NO GOOD". Your traffic would be the easy target for hackers.
How they know all the information? It’s quit simple. Most of ISP assigns /30 IP address block for connectivity between their edge device and CPE(Customer Premises Equipment) from big chunk of reserved IP block such as /16, B class IP block. So easy to recognize WAN IP address by traceroute. I don’t want to make a list of the IP blocks that ISP reserves for customer WAN link here. However, just googling the information, you will get it easily.
Another security warning on reverse-lookup data. Some of ISP update customer account#, interface and customer name on DNS reverse-lookup zone file.
Try reserve-lookup data on your WAN IP address, what information comes to you.
DOS prompt> nslookup x.x.x.x
You might surprise with the output.
If you are allocated IP block from your upstream provider, try reserve-lookup date for your IP block. It might expose your company name or IP assignment information.
Security hole is where you never expect!
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