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Cisco Bug: CSCvt14572 - Huge numbers of low TCP ports displayed in "show ip nat pool NAME"

Last Modified

Mar 23, 2020

Products (1)

  • Cisco 4000 Series Integrated Services Routers

Known Affected Releases

16.9.4

Description (partial)

Symptom:
No relevant log is being displayed, we must have NAT pool configuration, example:

ip nat pool NAT_Pool X.X.X.X X.X.X.X prefix-length 24
ip nat inside source list IP_permitted pool NAT_Pool redundancy 1 mapping-id 1 overload

Conditions:
We are seeing a wrong amount of low TCP ports available under "show ip nat pool NAT_Pool":

                              Assigned            Available
  Addresses                          1                    0
  UDP Low Ports                      0                  512
  TCP Low Ports             42345456792 194000744069414584836
  UDP High Ports                     0                64512
  TCP High Ports                    60                64492
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