Re: Help: network abuse

To: David Christensen <dpchrist@holgerdanske.com>
Cc: debian-user@lists.debian.org
Subject: Re: Help: network abuse
From: Dan Ritter <dsr@randomstring.org>
Date: Sat, 23 Dec 2023 19:15:30 -0500
Message-id: <[🔎] 20231224001530.gyciejvn4dj3lrks@randomstring.org>
In-reply-to: <[🔎] 1e5311ec-4b04-4743-8e79-3280d2bd848b@holgerdanske.com>
References: <[🔎] ZYQo93yeQTwjML_T@phcomp.co.uk> <[🔎] 69fa45e7-6f53-4c2e-977c-d0062d542714@holgerdanske.com> <[🔎] alpine.DEB.2.21.2312230849430.14395@dirac.home.woodall.me.uk> <[🔎] 1e5311ec-4b04-4743-8e79-3280d2bd848b@holgerdanske.com>

David Christensen wrote: 
> Does Debian and/or Linux support SYN cookies?

Yes.

Put

net.ipv4.tcp_syncookies=1

in an appropriate sysctl.d/ file.

To check on current settings:

sysctl -n net.ipv4.tcp_syncookies

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- Help: network abuse
  - From: Alain D D Williams <addw@phcomp.co.uk>
- Re: Help: network abuse
  - From: David Christensen <dpchrist@holgerdanske.com>
- Re: Help: network abuse
  - From: Tim Woodall <debianuser@woodall.me.uk>
- Re: Help: network abuse
  - From: David Christensen <dpchrist@holgerdanske.com>

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