There are many users who have created multiple ids with the same IP address and using them in a wrong way. Regarding this, what are the actions we should take?
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Given it is normal for all people working at a company to access the internet with the same IP address due to firewalls etc - and it is normal for many programmers to work at a single company, I don't think this is a good ideal.
The best way to deal with this is to flag their accounts, If there is any suspicious activity the mods will nuke those accounts.
If you own both accounts, You can flag any of your posts and ask the moderator to merge these two accounts.