How to check whether the IP addresses of interfaces in an OSPF area conflict

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For details about how to check whether the IP addresses of interfaces in an OSPF area conflict, see FAQ-How to Determine that the IP Addresses of Interfaces in an OSPF Area Conflict.

Other related questions:
How to check whether the configured OSPF router IDs conflict
For details about how to check whether the configured OSPF router IDs conflict, see FAQ-How to Determine that Configured OSPF Router IDs Conflict.

How to check whether an ARP Conflict Occurs ?
Run the display logbuffer command to display the system log and check whether the ARP conflict occurs, resulting in slow network access.

When prompted to configure NAT Server,AR router report ARP conflict or interface conflict ?
When configure NAT Server, if use the network interface IP address, there may be the following configuration error. [AR2200-GigabitEthernet0/0/1] IP 22.1.1.1 address 24 [AR2200-GigabitEthernet0/0/1] NAT protocol 80 global inside 22.1.1.1 10.1.1.1 server Error: The conflicts with or ARP interface address IP. At this time, need to configure NAT server command when the network port IP address to current-interface, as follows: [AR2200-GigabitEthernet0/0/1] NAT protocol 80 global inside current-interface 10.1.1.1 server

Method used to check the IP address conflict on the USG2000, USG5000, and USG6000
You can check the IP address conflict on the USG2000, USG5000, and USG6000 as follows: On the CLI, enter the display logbuffer command. For example: [USG5500]display logbuffer Logging buffer configuration and contents:enabled Allowed max buffer size : 1024 Actual buffer size : 1024 Channel number : 4 , Channel name : logbuffer Dropped messages : 0 Overwritten messages : 1200 Current messages : 514 %2015-04-24 10:56:26 USG5500 %%01ARP/4/DUP_IPADDR(l): Receive an ARP packet with duplicate ip address 192.168.101.207 from GigabitEthernet0/0/0, source MAC is 3400-a3d9-1897! //The conflicted address is 192.168.101.207.// %2015-04-24 10:56:21 USG5500 %%01ARP/4/DUP_IPADDR(l): Receive an ARP packet with duplicate ip address 192.168.101.207 from GigabitEthernet0/0/0, source MAC is 3400-a3d9-1897!

Remove IP address conflict on S series switch
In an ARP entry on an S series switch, except S1700, when one IP address matches multiple MAC addresses: If the switch functions as a DHCP server to assign IP addresses to clients, configure IP address conflict probing on the switch. If the switch functions as a gateway and IP addresses are statically assigned to clients, determine the clients using conflicting IP addresses and change the IP addresses for them manually.

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