Re: Help: network abuse

[David Christensen <dpchrist@holgerdanske.com>]

On 12/23/23 16:15, Dan Ritter wrote:
> 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


It looks like SYN cookies are enabled by default since 
debian-11.6.0-amd64-netinst (what I installed and have since tried to 
keep up to date):

2023-12-23 18:51:24 root@taz ~
# cat /etc/debian_version ; uname -a
11.8
Linux taz 5.10.0-26-amd64 #1 SMP Debian 5.10.197-1 (2023-09-29) x86_64 
GNU/Linux

2023-12-23 18:51:57 root@taz ~
# sysctl -n net.ipv4.tcp_syncookies
1


Thank you for the incantations.  :-)


David