1

I am trying to apply below nftables rule which I adopted from this guide:

nft add rule filter INPUT tcp flags != syn counter drop

somehow this is ending up with:

Error: Could not process rule: No such file or directory

Can anyone spot what exactly I might be missing in this rule?

2

You're probably missing your table or chain.

nft list ruleset

will give you what you are working with. If it prints out nothing, you're missing both.

nft add table ip filter # create table
nft add chain ip filter INPUT { type filter hook input priority 0 \; } # create chain

Then you should be able to add your rule to the chain.

NOTE: If you're logged in with ssh, your connection will be suspended.

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