# [DUPLICATE_ADDRESS](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS)

## SYSLOG Details
- **Message**: intf <variable>ip-address</variable> DAD detected duplicate IPv6 address <variable>interface-name</variable>, manual intervention required
- **Help**: Duplicate address detected in the network
- **Description**: The Neighbour Discovery Protocol process (NDP) received a NS/NA packet packet during Duplicate Address Detection (DAD) with an ipv6 address same as a local ipv6 address. Duplicate Address Detection (DAD) [RFC4862] is performed when an IPv6 node verifies the uniqueness of a tentative IPv6 address. Node sends a Neighbor Solicitation (NS) message with the IP destination set to the solicited-node multicast address of the tentative address. This NS message is multicasted to other nodes on the same link. When the tentative address is already used on the link by another node, this last one replies with a Neighbor Advertisement (NA) message to inform the first node. So, when performing DAD, a node expects the NS messages to be received by any node currently using the tentative address.
- **Type**: Error: An error occurred
- **Severity**: error
- **Cause**: -
- **Action**: -
- **Attributes**: ip-address
interface-name
- **Facility**: LOG_DAEMON

## Found this message in the following releases:
- [Junos OS Evolved 26.2R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=26.2R1)
- [Junos OS Evolved 25.4R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=25.4R1)
- [Junos OS Evolved 25.2R2](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=25.2R2)
- [Junos OS Evolved 25.2R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=25.2R1)
- [Junos OS Evolved 24.4R2](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=24.4R2)
- [Junos OS Evolved 24.4R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=24.4R1)
- [Junos OS Evolved 24.2R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=24.2R1)
- [Junos OS Evolved 23.4R2](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=23.4R2)
- [Junos OS Evolved 23.4R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=23.4R1)
- [Junos OS Evolved 23.2R2](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=23.2R2)
- [Junos OS Evolved 23.2R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=23.2R1)
- [Junos OS Evolved 22.4R3](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=22.4R3)
- [Junos OS Evolved 22.4R2](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=22.4R2)
- [Junos OS Evolved 22.4R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=22.4R1)
- [Junos OS Evolved 22.2R3](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=22.2R3)
- [Junos OS Evolved 22.2R2](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=22.2R2)
- [Junos OS Evolved 22.2R1](https://apps.juniper.net/syslog-explorer/?msg=DUPLICATE_ADDRESS&sw=Junos%20OS%20Evolved&rel=22.2R1)