<div dir="ltr">Hello,<div><br></div><div>I would like permission to contribute information to the wiki...</div><div><br></div><div>Username: CaseyDoyle</div><div><br></div><div>To append an additional method for ssh blocking with firewallD:</div><div><br></div><div>Page: </div><div><div><a href="https://wiki.centos.org/HowTos/Network/SecuringSSH#head-3579222198adaf43a3ecbdc438ebce74da40d8ec">https://wiki.centos.org/HowTos/Network/SecuringSSH#head-3579222198adaf43a3ecbdc438ebce74da40d8ec</a></div><div><br></div><div>Suggest to add the following info to it pertinent section:</div><div><br></div><div>------</div><div>6. Filter SSH at the Firewall</div><div><br></div><div>complementary to iptables method, there is firewall-cmd for newer systems using FirewallD:</div><div><br></div><div>firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT_direct 0 -p tcp --dport 22 -m state --state NEW -m recent --set</div><div>firewall-cmd --permanent --direct --add-rule ipv4 filter INPUT_direct 1 -p tcp --dport 22 -m state --state NEW -m recent --update --seconds 30 --hitcount 4 -j REJECT --reject-with tcp-reset</div><div>firewall-cmd --reload</div></div><div>------</div><div><br></div><div>Please advise.</div><div><div>Kind Regards,</div>-- <br><div class="gmail_signature">Casey Doyle<br>617-903-8254<br><a href="mailto:Cdoyle@TimelesslyPrecise.com" target="_blank">Cdoyle@TimelesslyPrecise.com</a><br><span style="font-size:10pt;color:green">Please consider the environment before printing this e-mail<br><br><br></span>***<br>This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they are
addressed. If you have received this email in error, please notify the
system manager. This message contains confidential information and is
intended only for the individual named. If you are not the named
addressee, you should not disseminate, distribute or copy this email.
Please notify the sender immediately by email if you have received this
email by mistake and delete this email from your system. If you are not
the intended recipient, you are notified that disclosing, copying,
distributing or taking any action in reliance on the contents of this
information is strictly prohibited.<br>***<span style="color:rgb(31,73,125)"></span></div>
</div></div>