Tag Archives: Fortinet

CPU Usage FortiGate 100D - 90D featured image

CPU Usage Increase FortiGate 100D -> 90D

A few weeks ago I swapped a FortiGate 100D firewall to a 90D firewall. The 100D was defective and needed to be replaced. Since the customer only has a 20 Mbps ISP connection, I thought that a FortiGate 90D would fit for the moment, since it has a firewall throughput of 3,5 Gbps, compared to the lower value of 2,5 Gbps from the 100D.

Indeed, it worked. However, the CPU usage increase was huge, almost related to the NGFW throughput. Here are some graphs:

Continue reading CPU Usage Increase FortiGate 100D -> 90D

Fortinet Feature Requests featured image

Fortinet Feature Requests

I really like the FortiGate firewalls. They are easy to manage and have lots of functionality. However, I am also aware of some other firewall products and therefore have some feature requests to Fortinet that are not currently implemented in their firewalls. I am sometimes forwarding these FRs to the Fortinet support or to an SE, but they are not really interested in that. ;( So here is a list of my ideas that could improve the firewall. Hopefully/maybe some of them will be implemented one day…

Continue reading Fortinet Feature Requests

FortiGate VIP SNAT featured image

FortiGate Virtual IPs without Reference

Migrating from Juniper ScreenOS firewalls to FortiGates, there are some differences to note with static NATs, i.e., Mapped IPs (MIPs) on a Netscreen and Virtual IPs (VIPs) on a FortiGate. While the Juniper MIPs on an interface are always used by the firewall whenever a packet traverses the interface, the virtual IP objects on a FortiGate must be used at least once in the security policy before they are really used by the firewall.

Continue reading FortiGate Virtual IPs without Reference

FortiGate VIP with Interface featured image

FortiGate Virtual IPs with Interface “Any”

On the FortiGate firewall, address objects and virtual IPs (VIPs) can be set up with an interface. For address objects this has no technical relevance – the address objects simply only appear on policies if the appropriate interface is selected. But for virtual IPs, this setting has relevance on how connections are NATed. This can be problematic.

Continue reading FortiGate Virtual IPs with Interface “Any”

FortiGate IPv4-vs-IPv6 featured image

FortiGate IPv4 vs. IPv6 Performance Speedtests

I was interested in the performance of my FortiGate firewall when comparing IPv4 and IPv6 traffic. Therefore I built a small lab consisting a FortiWiFi 90D firewall and two Linux clients running Iperf. I tested the network throughput for both Internet Protocols in both directions within three scenarios: 1) both clients plugged into the same “hardware switch” on the FortiGate, 2) different subnets with an “allow any any” policy without any further security profiles, and finally, 3) activating antivirus, application control, IPS, and SSL inspection.

Continue reading FortiGate IPv4 vs. IPv6 Performance Speedtests

FortiGate VPN Speedtests featured image

FortiGate VPN Speedtests

Triggered by a customer who had problems getting enough speed through an IPsec site-to-site VPN tunnel between FortiGate firewalls I decided to test different encryption/hashing algorithms to verify the network throughput. I used two FortiWiFi 90D firewalls that have an official IPsec VPN throughput of 1 Gbps. Using Iperf I measured the transfer rates with no VPN tunnel as well as with different IPsec proposals.

I first ran into really slow performances which were related to the default “Software Switch” on the FortiGate. After deleting this type of logical switch, the VPN throughput was almost as expected.

Continue reading FortiGate VPN Speedtests

FortiGate Switch Modes

FortiGate: Software-/ Hardware-/ VLAN-Switch

I am still a bit confused about the different switch types a FortiGate firewall is able to handle. While there are a lot of information on the Internet about the “internal-switch-mode” of “switch/interface“, I have not found any good information about the differences between the “Hardware/Software/VLAN” switch types that are configured via the GUI or via the “virtual-switch-vlan enable” CLI command. Though I still don’t know exactly all differences, I am trying to explain some of them here.

Continue reading FortiGate: Software-/ Hardware-/ VLAN-Switch

Tufin SecureTrack - Adding Devices featured image

Tufin SecureTrack: Adding Devices

Since a few weeks I am using Tufin SecureTrack in my lab. A product which analyzes firewall policies about their usage and their changes by administrators (and much more). Therefore, the first step is to connect the firewalls to SecureTrack in two directions: SSH from SecureTrack to the device to analyze the configuration, as well as Syslog from the device to SecureTrack to real-time monitor the policy usage.

This blog post shows the adding of the following firewalls into Tufin: Cisco ASA, Fortinet FortiGate, Juniper ScreenOS, and Palo Alto PA.

Continue reading Tufin SecureTrack: Adding Devices

fd-wv-fw04.cfg-172.16.1.6_connections-ws-l2-r1

MRTG/Routers2: Template FortiGate

A few weeks ago I constructed an MRTG/Routers2 template for the Fortinet FortiGate firewalls. I am using it for monitoring the FortiGate from my MRTG/Routers2 server. With the basic MRTG tool “cfgmaker” all graphs for the interfaces are generated automatically. My template is an add-on that appends graphs for CPU, memory, and disk usage, as well as connections and VPN statistics. Furthermore, it implements the ping statistics graph and a “short summary”, which only shows the system relevant graphs.

Continue reading MRTG/Routers2: Template FortiGate

CLI Commands for FortiGate Firewalls

CLI Commands for Troubleshooting FortiGate Firewalls

This blog post is a list of common troubleshooting commands I am using on the FortiGate CLI. It is not complete nor very detailled, but provides the basic commands for troubleshooting network related issues that are not resolvable via the GUI. I am not focused on too many memory, process, kernel, etc. details. These must only be used if there are really specific problems. I am more focused on the general troubleshooting stuff.

Continue reading CLI Commands for Troubleshooting FortiGate Firewalls

FortiGate IPv6 Config Commands featured image

Basic IPv6 Configuration on a FortiGate Firewall

It’s really great that the FortiGate firewalls have a DHCPv6 server implemented. With this mandatory service, IPv6-only networks can be deployed directly behind a FortiGate because the stateless DHCPv6 server provides the DNS server addresses. (This is unlike Palo Alto or Cisco which have no DHCPv6 server implemented.)

However, the configuration on the FortiGate is really bad because nothing of the IPv6 features can be set via the GUI. (And this is called a Next-Generation Firewall? Not only the features count, but also the usability!) Everything must be done through the CLI which is sometimes hard to remember. Therefore I am publishing this memo of the appropriate CLI configuration commands.

Continue reading Basic IPv6 Configuration on a FortiGate Firewall

FortiGate SMS featured image

FortiGate 2-Factor Authentication via SMS

Two-factor authentication is quite common these days. That’s good. Many service providers offer a second authentication before entering their systems. Beside hardware tokens or code generator apps, the traditional SMS on a mobile phone can be used for the second factor.

The FortiGate firewalls from Fortinet have the SMS option built-in. No feature license is required for that. Great. The only thing needed is an email-to-SMS provider for sending the text messages. The configuration process on the FortiGate is quite simple, however, both the GUI as well as the CLI are needed for that job. (Oh Fortinet, why aren’t you improving your GUI?)

Here is a step-by-step configuration tutorial for the two-factor authentication via SMS from a FortiGate firewall. My test case was the web-based SSL VPN portal.

Continue reading FortiGate 2-Factor Authentication via SMS

OSPFv3 Lab Featured Image

OSPFv3 for IPv6 Lab: Cisco, Fortinet, Juniper, Palo Alto, Quagga

Similar to my test lab for OSPFv2, I am testing OSPFv3 for IPv6 with the following devices: Cisco ASA, Cisco Router, Fortinet FortiGate, Juniper SSG, Palo Alto, and Quagga Router. I am showing my lab network diagram and the configuration commands/screenshots for all devices. Furthermore, I am listing some basic troubleshooting commands. In the last section, I provide a Tcpdump/Wireshark capture of an initial OSPFv3 run.

I am not going into deep details of OSPFv3 at all. But this lab should give basic hints/examples for configuring OSPFv3 for all of the listed devices.

Continue reading OSPFv3 for IPv6 Lab: Cisco, Fortinet, Juniper, Palo Alto, Quagga