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New Member

Response from nonexistent IPs

Good afternoon!

At my work I'm having an interesting issue.  I am trying to map out ip space in certain areas of my network through firewalls and determine what IPs are active and not.  The issue I am running into is that when I run NMAP or just a regular ping sweep I get a response no matter if there is a device on that IP or not.

Any ideas as to why this is?  Is there a config in the firewall that could cause the firewall to respond to any port or ICMP sweep and act as the nonexistent device?

Thanks!

Jay

2 REPLIES
Hall of Fame Super Silver

Response from nonexistent IPs

If the firewall has a static NAT rule it will respond to a ping on behalf of the true device IP.

New Member

Response from nonexistent IPs

There are no static NAT rules currently in the device.

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