FortiGate - Guía de resolución de problemas

by Efren Teruel Dominguez

He tenido la suerte y el privilegio de poder trabajar, primero como asesor técnico, y luego como traductor al español, de la obra de un colega y amigo mío:

https://lnkd.in/gbkqjTT

FortiGate - Guía de resolución de problemas

Fortigate, a Troubleshooting Guide es un excelente trabajo de Hubert Wisniewski, aprovechando sus muchos años de experiencia en el sector de la seguridad y la formación.

Conté con su confianza para este proyecto, que llevó bastantes horas y muy contento de que esté ya disponible a la venta a través de la plataforma de Amazon.

Se aceptan críticas constructivas! :D

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I have had the privilege and luck of being able to work, first as technical reviewer, and then as translator, for my friend and colleague Hubert's guide:

https://lnkd.in/gbkqjTT

FortiGate - Guía de resolución de problema

Fortigate, a Troubleshooting Guide is an excellent work by Hubert Wisniewski, using his many years of experience in Security Field. I got his trust to translate his book to Spanish, learning a lot during the process.

Happy to have the product already available in Amazon, hope you all enjoy it!

Efren Teruel Dominguez

Comments

What should you know about HA 'override enabled' setting on Fortigate?

High availability is mandatory in most of today's network designs. Only very small companies or branches can run their business without redundancy. When you have Fortigate firewall in your network you have many options to increase network availability. You can use Fortigate Clustering Protocol ( FGCP ) or Virtual Router Redundancy Protocol ( VRRP ). FGCP has two modes: 'override' disabled (default) and 'override' enabled . I'm not going to explain how to set up HA as you can find many resources on Fortinet websites: https://cookbook.fortinet.com/high-availability-two-fortigates-56/ https://cookbook.fortinet.com/high-availability-with-fgcp-56/ Let's recap what is the main difference between them. The default HA setting is 'override' disabled and this is an order of selection an active unit: 1) number of monitored interfaces - when both units have the same number of working (up) interfaces check next parameter 2) HA uptime - an

MAC Authentication Bypass

One of the method to control your network is using MAB feature. It is helpful in case you have devices without dot1x functionality. Today I will try to implement basic configuration and analyze log messages. There is only one switch SW1 and one device attached to port Fa1/0/2. ! aaa new - model aaa authentication dot1x default group radius ! ! int Fas1 / 0 / 2 authentication host - mode single - host authentication port - control auto mab ! I haven’t configured ACS yet but let’s see what error message I receive: SW1 ( config - if ) # mab - ev ( Fa1 / 0 / 2 ): Received MAB context create from AuthMgr mab - ev ( Fa1 / 0 / 2 ): Created MAB client context 0x1100000F mab : initial state mab_initialize has enter mab - ev ( Fa1 / 0 / 2 ): Sending create new context event to EAP from MAB for 0x1100000F ( 0000.0000 . 0000 ) mab - sm ( Fa1 / 0 / 2 ): Received event 'MAB_START' on handle 0x1100000F mab : during state mab_initia

Inpection of asymmetric sessions on FortiGate

There is one feature available on FortiGate, and I think you should know it, as it modifies a bit what we know about stateful firewalls. In past every packet was treated individually and you had to create policies in both directions. With stateful firewalls we can track connections, and by checking couple of attributes, we can treat them as part of the same session. For example when you initiate connection from a host1 to host2, the returning connection from host2 to host1 will be treated as part of the same connection (session). They have to have the same source/destination and destination/source IPs, port numbers and interfaces.There is an exception from this rule and FortiGate in some specific cases can accept connections on port which was not used in the initial connection. Let me explain how it works on the below example: The host1 has a default gateway on R1 (10.0.1.2), but you may notice that it is not the optimal path to host2 subnet. When we analyze the packet flo

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