Sometimes it is necessary to change IP address used to talk with the internet that the internal client is using. For instance it is always important to make sure your SMTP server is using the same outbound IP used for inbound traffic. I have seen this cause a good many mail servers to be blacklisted by ISPs. In the following entry we will change the IP the client is using for outbound nat.
This technique has many awesome benefits, you can nat into this IP (IP pool) only when going to a certain destination.. etc. For example, if you had to change your source IP when accessing a destination across a VPN tunnel. That example might be very important in a medical field where I have found you almost always have to nat your private traffic to a public address when accessing the VPN hosts.
The internal client address is 10.64.16.10, external IP is 18.104.22.168. In this example I only want this one internal client to be natted out of 22.214.171.124
So we have to create a Virtual IP pool . We create the Virtual IP pool by going to Policy and objects – objects – IP Pools
We then can setup the pool. Notice the options
– Overload allows PAT, so many ip addresses, to one public.
– One-to-One allows one IP to that public IP
– We also have the option to nat into a Public Range of addresses
We also want this device to answer VIA Arp for 126.96.36.199
Now lets create our IPv4 Policy to allow our private IP address to be allowed to the internet (WAN1) and to be natted VIA this IP pool. I created the address object for my private host already.
So after creating our IPV4 policy, we have one thing left to do – make sure this is one of our first policies hit when 10.16.64.10 tries to access the internet. So lets make sure its at the top of our list, or at least above our default nat rule.
That’s it! if you now go to a site such as ipchicken.com or whatismyip.com you will see 188.8.131.52 if you are coming from 10.16.64.10.
The other day I had the need to plug a Ruckus Access point directly into the Fortigate firewall. The client only needed 1 AP, and connecting directly into one of the ports on the Fortigate was the best way – PoE was provided by an injector.
The question came up of how to create the Vlan interface when directly connecting the device to Fortigate.
In this example I will create the vlan on the Internal switch “lan”, and control the vlan from the Ruckus Zonedirector. This will create two separate logical interfaces. Internal, and Staff-Wireless, my newly created vlan. These two interfaces will require IPV4 policies to allow communication. If you have a lot of VLANs it might be a great idea to utilize Zones in the FW to reduce the number of firewall policies needed.
Lets get started
Vlan creation of Fortigate
So, lets create the vlan for “Staff-Wifi” Vlan 200. You can just create
Now lets put in the needed info.
The below shows the status of the interface:
Notice the VLAN ID – this is seen by right clicking the column settings and enabling that.
Thats it! The Ruckus AP will tag “Staff-Wireless” traffic as vlan 200. So, when the FGT sees the vlan tag of 200 on any ports in the lan switch, it will be treated as Staff-Wifi, thus getting all of its network and policies.
To make the AP work correctly, it needs to be plugged directly into the FGT or a switch behind the FGT that has the vlan created and that vlan would need to be tagged on both the AP and uplink to Fortigate.
Below shows the advanced options of my Ruckus ZD. I am tagging the Staff-Wifi SSID as vlan 200.
Remember on the Ruckus side only vlan 200 is being tagged for Staff-wifi AP management traffic is untagged – so it would be on my “LAN” switch network.
Sometimes I get asked by clients how to block know attacking countries like Russia, or China from accessing their websites. I often hear that only US connections would be accessing their services so why allow others who might not be on the up and up.
Of course most attackers might pivot from compromised computers in the US, and thus bypass this security feature, but either way its not a bad idea. The below gives a good example on how to create a firewall “country” group and then block those countries from accessing any services hosted through the firewall. This will be done in Forti-OS 5.4.0. Its really the exact same steps in 5.2.
Also, there are many ways to do this. Instead of blocking Geographic regions you could only allow the ones you want to give access to.
Before beginning it might be a great idea to check out the new Fortiview feature to see what countries access your services the most. Under Fortiview- you can now see the countries tab.
Great, so in this example lets block the region of China – I know its not one of the top countries accessing my services.
First lets create the address object that we want to block. In this case I am setting the name of the address object as the country I am blocking. After creating the country object, I will create an address group call “Country blocks” add this to my firewall policy. That way in the future if I want to block Ireland, I can just add that object in the group and I am done.
Creating the address object for “China”. First go to “Policy & Objects” and create a new object.
Next we will fill in the needed info, and change the address type to “Geography”.
Now lets great that group, and add the “China” object to it.
Awesome, now just one more step – creating the firewall policy to block this address group.
Press OK, move this policy to the top of all WAN-LAN or your interfaces policies. This way it gets hit before anything else.
There are more ways than 1 to do this. when allowing traffic into your VIP or policy you could instead specify only the allowed countries.
In 5.4 you now have the option to change the interface color. This is a great setting, because I am not a fan of the emerald green interface that’s default.
This is a great option, and easy to change.
To change the color just navigate to System – settings. At the bottom under view settings you will see the option to change the theme. There are currently 4 colors available. Green, red, blue, and my favorite Melongene. Good Job Fortinet!
I like to keep routing tables as clean as possible, and if your IP design and structure allows for very classful subnetting then there is no reason, I see to advertise all of your individual subnets when you could just have one aggregate address advertise out instead. Of course there are numerous reasons why you would not want this, route manipulation, etc.. but not in this case.
At this site my networks all fall into the 10.56.0.0/22 subnet.
As of now, my networks that are broadcasting to my BGP peer look like this:
The commands to enable route aggregation is listed below. What happens is that any networks within our aggregation block will stop advertising and in their place one summary route is added and advertised.
Now a get router info bgp will show that we went down from advertising 5 networks to advertising 2. This might not seem like a big deal, but if you had a large BGP network, with 100 sites like this, then aggregation can make a huge difference in router performance.
I have been working with Fortigate for a long time now, one thing that bugged the life out of me (and most clients I work with) is that Fortigate’s SSL VPN feature would not allow you to specify certain settings per portal or group. For example DNS servers and Domain suffixes. Most firewall/router vendors have been able to do this for years and with no problem.
Starting in firmware 5.2.2 you can now specify individual DNS servers per portal! That’s right, if I have two different domains using the SSL VPN and I specify individual user groups and portals, now I can give each side their own specific DNS servers.
The DNS setting per portal is CLI only as of firmware 5.5.5 – I see this changing in future firmwares (Still has not changed in 5.4.1 either) . The modification is under the VPN – SSL – Web portal options. You can also specify individual WINS servers. This entry is written for someone who already has the SSL VPN up and working. Something to note is that these portal settings override the global DNS settings configured under
config vpn ssl web portal
edit “Sales-Portal” set tunnel-mode enable set ip-pools “VPN-Pool” set split-tunneling-routing-address “SSL-VPN-ROUTES” set dns-server1 10.60.134.5 —DNS Server 1 , Overrides global config set dns-server2 10.60.134.6 — DNS Server 2 , Overrides global config next
And there we have it! We then can of course associate the portal with a certain group of users, so for example Domain 1 get Domain 1’s server and same for Domain 2.
Hello, I noticed one thing I have never created a blog entry on creating a Virtual IP to allow access from the internet into a local server. This entry is for a VIP and Policy creation on firmware 5.2> . Remember all the best documentation is located at docs.fortinet.com
So what is a VIP, a Virtual IP is one way to allow external traffic going to a Public address to be forwarded in to a Local server with a Private address. Basically, its a NAT object consisting of external IP and port and Internal IP and port. Before this firewall will allow traffic to access the NAT object (VIP) it needs to have a Firewall policy allowing the destined traffic to the VIP.
So, lets create a VIP. First lets navigate to Policy & Objects, Objects, and Virtual IPs. Lets create a new object.
Now, lets input the information needed to have external connections reach our internal network. In this example my outside web server listening address is 184.108.40.206 (my fake public IP) , my internal web server at 172.16.1.10 and my answering interface (the interface accepting connections) is WAN1 (QXnet). So, start out naming the VIP something that will have meaning to you. Then select the incoming interface, and apply the correct IP information. You will then have the option to do a port forward (1 port or a range forwarded into the server), or a 1-1 nat, where all ports are forwarded. If you do a Port Forward, select the protocol, and then set the ports.
In this example I am allowing port 80 on my public IP to be forwarded to port 80 on my private server.
Great, we have created the VIP object. But, as of now no traffic will be allowed to go to the private server. We have to add a Firewall policy to allow that traffic to the VIP.
Lets navigate to Policy & Objects, Policy, IPV4 then create a new policy.
Below shows the settings. The settings read like this : Incoming Interface – This would be where traffic is coming from, in this case the WAN1 interface. Source address: this would be the actual address its coming from, in this case it could be anyone on the internet, so I will select all. Source users, and devices can be left blank. Outgoing interface: this is were the traffic is going, in this case its going to my server located on my LAN interface. Destination address, this is the tricky part. The destination address will be the VIP you created. In 5.2 notice the ICON. Its different then normal address objects, thus specifying, if your name didn’t, that this is a VIP. You then have to specify the server you want to allow in, I am creating the VIP to allow HTTP into the network, so I will only specify HTTP traffic to be allowed in.
For traffic coming into the firewall we do not need to NAT this traffic, please turn this off. In 5.2> it is on by default when you create a policy.
If you require any UTM features to be on, this is the time.
That’s It! Fortinet makes it very easy to create these VIPs.
If you are not sure if your VIP is working, there are many ways to check/troubleshoot. One way would be to test it, does your server answer? You can also do an online port scan using any many tools online. you can also check the hit counts on the policy (See below). The hit counter should be there by default, but if not add it in by right clicking on the tool bar and selecting Count as one of your columns. I have used the hit counter many times to troubleshoot my VIPs not working. For example, if I try to access my server VIA the public IP, and I get hit on my policy – I know that everything is correct on my VIP. I will then make sure my ports/server settings are correct. You could also do more advanced troubleshooting like debugging the traffic, or do a packet capture on the firewall.
The Fortianalyzer is a great product. It can give very deep analysis of exactly what is going through the network and allow you to create/schedule reports to show this data. You also have very quick detailed monitoring at hand with the Fortiview. By default the Fortigates connect to the FAZ via SSL, all logs are encrypted. Recently, and I am not sure what the issue is, I have been having issues with certain FGTs connecting to the FAZ via SSL (I think its a cert issue..but still checking). So, we have a different option, to use IPSEC to create a tunnel and allow everything to be encrypted that way. This works great.
What we need to do
FAZ: add the device manually in the FAZ, enable “Security”, change the Local ID, Set the PSK.
FGT: Go in through CLI, disable SSL encryption, enable IPSEC, set the PSK.
So lets go to step one – adding the the device in the FAZ.
Log into the device, and select whatever Adom you want to add the FGT into. Then select to add a device, once this pops up fill in the needed info, you will need an admin account.
Select “Next” and fill in the needed info, you will need the S/N for this.
Once that is added you will be able to edit the device. Right click on the device name and select Edit.
From here you will need to enable IPSEC by checking “Secure Connection” and change the PSK. Notice Local ID this is what will identify the FGT. By default its the S/N but you can change it to anything. In this case I am using FGT1.
Now you should see something like this, notice that “Secure connection” is red.
Great, now its time for the device settings. I am going to do this through the CLI, its the only way to set the PSK as far as I know.
The commands are listed below. One thing to note is that once you select “Encrypt” you disable SSL and enable IPSEC.
After all the commands are entered, you should be able to go to Log-Log Config-and test the connection to the FAZ. It should pop up that everything is working as listed below:
Lets check on the FAZ, to make sure everything looks correct.
Ok, this all looks great. That’s it, now we are using IPSEC to encrypt the logs. Its a good alternative to SSL if you find your self in the situation that the FGTs will not connect do to cert issues.
The entry is written for a 90d, but will work the same for a 60d or 80d, even some C models.
By default the Fortigate is in “Switch mode” you will only be able to see the “internal” switch, and cannot add or remove interfaces from this switch. In this mode you can add more switches, but not remove the current ports.
In the next few parts we will change the switch mode to interface, and be able to add/remove ports and switches.
Before doing anything to the Firewall make a backup. When we actually change the interface mode it will delete the IP address on the internal interface. So connect to a WAN or DMZ port and use the GUI, or make sure to be consoled into the firewall VIA the serial port (console).
First we need to remove any reference to the “internal” switch itself. If you have a default config then there will be only two. The internal->WAN policy, and the DHCP server under the “Internal” interface.
You can see all references attached to the interface by navigating to System-Network-Interfaces and modifying the settings to show the Reference tab.
once those references show up, you can click on the number and navigate to the exact location of that reference. For example, let say you added an address object a long time ago and added the interface. Bingo – shows you exactly where.
After removing all the references by deleting them (yes, deleting.. so make a backup!) you should now see a 0 balance in the references. We can now change the interface mode in CLI.
You can either do this through a terminal such as putty, or through the GUI CLI app. Remember after changing the interface mode, it will delete your IP address on the internal network. So do this VIA Console, or go to the GUI on the WAN or DMZ interface.
config system global
set internal-switch-mode interface
Then click y to reboot the firewall, when it comes back it will be in interface mode.
Once it is back up, login VIA the GUI on either the WAN1, WAN2, or DMZ ports. Then you should see something like this:
Now, under this page System-Network-Interfaces lets click the “Create” Button. From here you can create your switch. Select the type as Software or hardware switch depending on your model. You can also add your ports, set the name of the interface and the IP.
Once you press OK, you should see your new interface listed under system-network-interface as seen below
Recreate all of your policies, to allow access to and from and everything should work great. If you have any questions or I failed to explain anything please let me know.
You can use a different IP address to answer for the SSL VPN.
Lets say that your interface IP (The default IP address that is used with the SSL VPN) already has HTTPS (443) forwarded in to a internal server, and you really want the SSL VPN port to be 443. You have an option.
You can add a secondary IP address under the WAN interface that does not have a reservation already for 443. Then use this IP address for the SSL VPN.
To do so:
Add your secondary IP address – Note this has to be a public address, given to you by your ISP..
Then go into the VPN settings and modify the port for what you want. Notice that the address it says will work is still the primary IP, even though the secondary will work just fine.