How does Discovery handle IP address duplicates?

[Astrid Peraza1]

We are currently using Discovery to manage inventory. However I noticed that there are a couple of different devices with the same IP address and this is happening for multiple IP addresses, they have multiple records related to the address. How does Discovery handles this? is there a way to look for the serial number and update the IP address? No duplicates with same serial number are being created, but IP addresses are having more than 1 record associated to them. 

[Ishita Shrivast]

Hey there,

Please go through below links, may be this will help you.

https://community.servicenow.com/community?id=community_blog&sys_id=3efc66a5dbd0dbc01dcaf3231f96193b

https://community.servicenow.com/community?id=community_question&sys_id=362fc445db625f005129a851ca96...

If it helps you in anyway, please mark it as correct or helpful.

Thanks and Regards,

Ishita Shrivastava.

[Anil Shewale]

There are 2 identification rules on IP Address table for IP Address and Netmask

         1)CI duplicates with same name but different in discovery Source(Either the Source is empty or the Source is Service now)

         2)For some duplicate records discovery source is empty even then updates are being done(checked based on updates column) 

        3)While comparing the difference between duplicates ,I found that DNS Name is linked for a record which has Discovery source as empty .

        4)While checking updates Count most of the records with Discovery source as null are having updates than records with source as Service now.

find attached doc. 

Mark my ANSWER as CORRECT and HELPFUL if it helped

Regards

Anil Shewale

[David Casper]

You will need to make sure to update your identification rules for the related CI classes. This is what SNOW uses to identify CIs being brought it and it tells it to either update existing records or create new ones. 

Duplicate IPs is not uncommon, but it's all dependent on your unique environment.

Have you reviewed those rules at all yet?