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Central SNAT Map

A table FortiGate which defines the source translation rules in Central mode NAT.

TopicIT knowledge → About 1 min read

Simple definition

A table FortiGate which defines the source translation rules in Central mode NAT.

Technical definition

Central SNAT Map selects source, destination, interface and IP pool to apply the SNAT separately from the firewall Policies.

What is it used for ?

Centralize the outgoings in complex architecture.

Practical example

Several VLAN can be NATed to different public IPs via centralised rules,1990T.

Common issues

  • Order of incorrect rules
  • Invalid pool
  • Confusion between policy NAT and Central NAT

Key takeaway: Exact behavior and commands may vary depending on versions, products and architectures.

Related resources

Relevant topic Central NAT FortiGate A mode that separates the rules NAT Security Policy FortiGate. Relevant topic IP Pool FortiGate An object representing one or more IP addresses used for the SNAT. Relevant topic NAT Translation of network addresses used in particular to share a public IP address between several private devices Relevant topic SNAT A NAT translation that replaces a packet source address as it crosses a device.
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