netdev - Re: [PATCH] document danger of '-j REJECT'ing of '-m state INVALID' packets

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Message-ID: <CANP3RGeonDWcL72_zGrucvsGpyZchDML5DzSbHgiJBDHX=Zn4A@mail.gmail.com>
Date:   Sat, 9 May 2020 11:02:23 -0700
From:   Maciej Żenczykowski <zenczykowski@...il.com>
To:     Jan Engelhardt <jengelh@...i.de>
Cc:     Pablo Neira Ayuso <pablo@...filter.org>,
        Florian Westphal <fw@...len.de>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>,
        Netfilter Development Mailing List 
        <netfilter-devel@...r.kernel.org>
Subject: Re: [PATCH] document danger of '-j REJECT'ing of '-m state INVALID' packets

Side note, it doesn't have to be nearly as aggressive as the above.

With just:
  tc qdisc replace dev ifb0 root netem reorder 99.9% 0% delay 1s
I still see 169.58M @ 7.02MB/s in 26s:
  [24263:180667450] -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
  [27:174654] -A INPUT -m state --state INVALID -j DROP
  [0:0] -A INPUT -p tcp -j REJECT --reject-with tcp-reset

And the connection still freezes without the INVALID/DROP rule (after
43MiB this time)