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Cisco Bug: CSCur24883 - 6500 :: allows overwriting of ARP belonging to IP from NAT pool

Last Modified

Feb 03, 2017

Products (1)

  • Cisco IOS

Known Affected Releases

15.1(2.12)

Description (partial)

Symptom:
On catalyst 6500 ARP entry for IP belonging to NAT pool points to incorrect MAC.
The MAC should be belonging to 6500, instead it belongs to other devices in the network.
Problem is seen whenever catalyst6500 receives GARP for IP belonging to NAT pool.

Conditions:
- Catalyst6500 performing nat.
- There is device in the network that would sent GARP for IP belonging to NAT pool eg. nexus configured with "ip local-proxy-arp"
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