netdev - Re: amplifying qdisc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200708232634.0fa0ca19@hermes.lan>
Date:   Wed, 8 Jul 2020 23:26:34 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Russell Strong <russell@...ong.id.au>
Cc:     netdev@...r.kernel.org
Subject: Re: amplifying qdisc

On Thu, 9 Jul 2020 16:10:34 +1000
Russell Strong <russell@...ong.id.au> wrote:

> Hi,
> 
> I'm attempting to fill a link with background traffic that is sent
> whenever the link is idle.  To do this I've creates a qdisc that will
> repeat the last packet in the queue for a defined number of times
> (possibly infinite in the future). I am able to control the contents of
> the fill traffic by sending the occasional packet through this qdisc.
> 
> This is works as the root qdisc and below a TBF.  When I try it as a
> leaf of HTB unexpected behaviour ensues.  I suspect my approach is
> violating some rules for qdiscs?  Any help/ideas/pointers would be
> appreciated.

Netem can already do things like this. Why not add to that