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Date: Tue, 19 Nov 2024 17:06:17 +0100
From: Florian Westphal <fw@strlen.de>
To: Slavko <linux@slavino.sk>
Cc: netfilter@vger.kernel.org
Subject: Re: set with limit
Message-ID: <20241119160617.GA21970@breakpoint.cc>
References: <756a9507-5ecf-4ba4-a8d3-d364f13dbfd5@slavino.sk>
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User-Agent: Mutt/1.10.1 (2018-07-13)

Slavko <linux@slavino.sk> wrote:
> with nft v1.0.6 and kernel 5.10.226 i want to limit logging count
> by IP. I setup set:
> 
>     set log_base4 {
>         typeof ip saddr
>         size 1000
>         flags dynamic,timeout
>         limit rate 1/minute burst 2 packets
>         timeout 1h
>         comment "IPv4 base log limit"
>     }
> 
> It is then used in chain:
> 
>     chain input {
>         type filter hook input priority filter + 5; policy accept;
>         ...
>         update @log_base4 { ip saddr } log group 0
>     }
> 
> I see, that set is filled/updated by particular IP:
> 
>     elements = { X.Y.Z.W timeout 1h expires 59m59s360ms }
> 
> But i see 15 lines per minute (it sends packet every 4 sec) for that
> IP. I expect max 2 lines per minute...
> 
> Please what i did wrong?

Looks like 5.10 is too old, listing should show limit expression was
attached, i.e.:

 elements = { x.y.z.w limit rate 1/minute burst 2 packets timeout 1h expires 59m55s504ms, ...

... (this is with 6.11.5 and your rules above).