From: Florian Westphal <fw@strlen.de>
To: Alberto <alberto@bersol.info>
Cc: netfilter@vger.kernel.org
Subject: Re: [nftables] Log to DNAT rule
Date: Mon, 12 Oct 2020 13:08:36 +0200 [thread overview]
Message-ID: <20201012110836.GH5723@breakpoint.cc> (raw)
In-Reply-To: <d847854e-8457-fc84-dca7-f1a4fedb978a@bersol.info>
Alberto <alberto@bersol.info> wrote:
> > I'm starting with nftables, and I want to log SSH inputs, but I have SSH
> > port in another port with "prerouting" with this rule:
> >
> > -----------------------------------------------
> > table ip my-nat {
> > chain PREROUTING {
> > type nat hook prerouting priority 0; policy accept;
> > iifname "enp1s0" tcp dport 9999 dnat to 192.168.1.3:22
> > <http://192.168.1.3:22>
> > ...
> > But this log any try to 22 port (there are thousands daily), and I want
> > log only conections to 9999 port, because only on this port, return
> > login.
> >
> > If my Inputs rule are the following...
> >
> > -----------------------------------------------
> > ...
> > iifname "enp1s0" tcp dport 9999 ct state new log prefix "[NFTABLES]
> > SSH: " accept
> > iifname "enp1s0" tcp dport 22 ct state new accept
> > ...
> > -----------------------------------------------
> >
> > It log nothing.
iifname "enp1s0" meta l4proto tcp ct state new ct original proto-dst 9999 log prefix "[NFTABLES] SSH: " accept
prev parent reply other threads:[~2020-10-12 11:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <dfc15fba-2fff-a658-c4db-fc0a64603fb6@bersol.info>
2020-10-11 10:43 ` [nftables] Log to DNAT rule Alberto
2020-10-11 18:31 ` Eliezer Croitor
[not found] ` <CAKcfE+aM_r4J9t=8GnjhXbZfBeDj7B2_66O_CYeY94NpvWcxOw@mail.gmail.com>
2020-10-12 10:31 ` Alberto
2020-10-12 11:08 ` Florian Westphal [this message]
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