Security Gateway Manual SG-3100
The lack of a selected gateway in the interface configuration causes the firewall to treat the interface as a LAN type
interface.
The firewall uses LAN type interfaces as sources of outbound NAT traffic but does not apply outbound NAT on traffic
exiting a LAN. The firewall does not add any extra properties on firewall rules to influence traffic behavior. The DNS
Resolver will accept queries from clients on LAN type interfaces.
See also:
Interface Configuration
2.6.4 DHCP Server
Next, configure DHCP service for this local interface. This is a convenient and easy way assign addresses for clients
on the interface, but is optional if clients will be statically addressed instead.
• Navigate to Services > DHCP Server, OPTx tab (Or the custom name)
• Check Enable
• Configure the Range, e.g. from 192.168.2.100 to 192.168.2.199
This sets the lower (From) and upper (To) bound of automatic addresses assigned to clients.
• The rest can be left at defaults
• Click Save
See also:
DHCPv4 Configuration
2.6.5 Outbound NAT
For clients on this interface to get to the Internet from private addresses, the firewall must apply Outbound NAT for
the new subnet.
• Navigate to Firewall > NAT, Outbound tab
• Check the current outbound NAT mode
If the mode is set to Automatic or Hybrid, then this may not need further configuration. Ensure the new LAN subnet
is listed as a Source in the Automatic Rules at the bottom of the page. If so, skip ahead to the next section to configure
Firewall Rules.
If the mode is set to Manual, create a new rule or set of rules to cover the new subnet.
• Click to add a new rule at the top of the list
• Configure the rule as follows:
Interface Choose the WAN interface. If there is more than one WAN interface, add separate rules
for each WAN interface.
Address Family IPv4
Protocol Any
Source Network, and fill in the new LAN subnet, e.g. 192.168.2.0/24.
Destination Any
Translation Address Interface Address
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