[Bug 192888] New: ipfw NAT vulnerable to simple DOS attacks

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192888

            Bug ID: 192888
           Summary: ipfw NAT vulnerable to simple DOS attacks
           Product: Base System
           Version: 9.2-RELEASE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: napTu at front.ru

ipfw NAT vulnerable to DOS attacks by sending ip packets to external ip address
and any port.
In this situation CPU usage goes to 100%.

NAT should find a matched internal address, and, if not, skip the packet to
external ip.

This process (with failed search) take a many time and resources.

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