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Posted byNSE56 months ago
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Does 'set nat-source-vip enable' have a purpose?
I'm trying to figure out what the command 'set nat-source-vip enable' is for, it is a command available in CLI under VIP configuration. FortiNet doc is for the command is here : link
My goal is relatively simple, I need to convert Cisco ASA bi-directional NAT rules to FortiGate VIP (and/or IP Pools). In Cisco ASA, when defining a static NAT rule, the rule will be active for both destination NAT and source NAT (DNAT and SNAT). I understand that NAT on FortiGate is not the same as on ASA, and that you are supposed to configure VIP's for inbound traffic (DNAT) and IP pools for outgoing traffic (SNAT). However, I would like to use the VIP external IP as SNAT when possible in order to greatly simplify the rule configuration.
In FortiGate, for each NAT rule to be migrated, I am configuring a VIP, and then I reference this VIP in a policy
requiring DNAT. So far so good, no confusion.
requiring DNAT. So far so good, no confusion.
Now, for SNAT, things get a little tricky. This link describes how VIP's work quite well: link
Something that needs to be considered when there are multiple Public IP addresses on the external interface(s) is that when a Virtual IP address is used without Port Forwarding enabled there is a reciprocal effect as far as traffic flow is concerned. Normally, on a firewall policy where NAT is enabled, for outgoing traffic the internal address is translated to the Public address that is assigned to the FortiGate, but if there is a Virtual IP address with no port forwarding enabled, then the Internal IP address in the Mapped field would be translated to the IP address configured as the External Address in the VIP settings.
So great, that's what I'm looking for. I did some testing and confirmed that the VIP is used for DNAT for outgoing traffic as long as I had the following:
- An incoming policy where the VIP is referenced as destination
- An outgoing policy allowing traffic from the mapped IP
- NAT enabled in the policy using 'NAT to outgoing interface address'
- No port-forwarding configured on the VIP
Now for the part that I can't figure out, there is a CLI command called 'set nat-source-vip enable'. The CLI reference documentation states that 'enable' is the default value, but on the FortiGates I've seen (versions 5.6.6 and 6.0.3), the default is 'disable'.
nat-source-vip {disable | enable}
Enable (the default) to prevent unintended servers from using a virtual IP. The virtual IP will be used as the source IP address for connections from the server through the FortiGate.
Disable to use the actual IP address of the server (or the FortiGate destination interface if using NAT) as the source address of connections from the server that pass through the FortiGate unit.
This description is so confusing to me, I can't figure out what the meaning of 'prevent unintended servers from using a virtual IP' is. I've tried setting the value to 'enable' and 'disable' and can't seem to find any difference in SNAT VIP behavior. I found some old posts in various forums (example1, example2, example3) stating you need to use this command set to 'enable' to get SNAT to use the VIP address, but I get it to work even if it is set to 'disable'.
Does anyone here have some experience with the real purpose of this command? I would love to see an example illustrating it's effect.
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Sorting and filtering email can be difficult to do if you receive a lot of it at different email accounts. The majority of emails that I receive to my email accounts fall into the categories of spam, advertising or newsletters, but the large volume of it makes it so that I might accidentally delete an important message. One way to avoid this is to filter emails into a special VIP inbox on your iPhone. You specify contacts on your iPhone, such as friends, family members or work colleagues, from who you actually want to receive email. This mail then gets filtered to the VIP inbox so that you don’t accidentally overlook it while browsing through your regular inboxes. So continue reading below to learn how to use the VIP inbox in the Mail app on your iPhone.
Creating a VIP in Mail on the iPhone
Note that this method is going to require that the email address that you want to filter to your VIP inbox already exists in your iPhone as a contact. If the email address is not attached to a contact a contact, then you will need to create that contact, or add the email address to an existing contact. So once you have the contact set up, follow the steps below to add that contact to your VIP inbox.
Step 1: Touch the Mail icon.
Step 2: Touch the VIP option on the Mailboxes list. If you are currently in an inbox, simply touch the Mailboxes button at the top-left corner of the screen.
Step 3: Touch the Add a VIP button at the center of the screen.
Step 4: Navigate through your list of contacts, then select the one that you want to filter to your VIP inbox.
Note that these messages will still be accessible from the inbox to which they were originally sent. Adding them to your VIP list will simply filter them to the VIP inbox.
Do you have an email account on your phone that you aren’t using for anything but spam? Learn how to delete that email account from your iPhone 5 and reduce the number of messages that you need to sort through.
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