Incorrect Hash Error

There are a few reasons why this error turns up in the system logs, some more worrisome than others.

If CARP is not working properly when this error is present, it could be due to a configuration mismatch. Ensure that for a given VIP, that the VHID, password, and IP address/subnet mask all match.

If the settings appear to be proper and CARP still does not work while generating this error message, then there may be multiple CARP instances on the same broadcast domain. Disable CARP and monitor the network with tcpdump to check for other CARP or CARP-like traffic, and adjust VHIDs appropriately.

If CARP is working properly, and this message is in the logs when the system boots up, it may be disregarded. It is normal for this message to be seen when booting, as long as CARP continues to function properly (primary shows MASTER, secondary shows BACKUP for status).