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Cisco Bug: CSCvs75416 - ASA allows ip local pool to use a pool larger than the configured mask

Last Modified

Apr 13, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.10(1) 9.12(1) 9.12(2) 9.8(2) 9.9(2)

Description (partial)

Symptom:
some addresses are not assigned from the local pool even though the ASA shows them as available addresses

Conditions:
ASA configured with "ip local pool" with a mask smaller than the number of addresses configured
i.e ip local pool test 192.168.0.1-192.168.0.30 mask 255.255.255.240
192.168.0.15 and 192.168.0.16 will be available in the ASA but will not actually get assigned because the mask breaks 192.168.0.x into subnets with usable addresses 192.168.0.1-14, 192.168.0.15 is actually a broadcast address for the first subnet, and 192.168.0.16 is the network address for the next subnet so end devices will not accept it as a usable address.
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