Metacom MC601 Router
Page 29
User Manual
3.5.5 Firewall NAT
Network Address Translation is the translation of an IP address used within one network to a
different IP address known within another network. One network is designated the inside network
and the other is the outside. This helps ensure security since each outgoing or incoming request
must go through a translation process that also offers the opportunity to qualify or authenticate the
request or match it to a previous request. NAT also conserves on the number of global IP addresses
that a company needs and it lets the company use a single IP address in its communication with the
world. NAT on the router can be used to masquerade or hide the inside LAN IPs when accessing the
internet.
Select
If the checkbox is selected then the buttons below will apply to this rule.
Source IP
Originating network/IP e.g. 192.168.2.0/24
Outgoing interface
Interface where the traffic will leave the firewall. It can either be eth0 (LAN1), eth1 (LAN2), ppp0
(GPRS) and ppp1 (VPN). Usually you specify ppp0 as this is where a connection can be established
to the internet.
Active
If checked then this NAT rule is active.
Save
Save the currently edited NAT rule.
Edit
Edit the selected NAT rule.
Delete
Delete the selected NAT rule.
Reset
Revert back to the last committed NAT rule set.
Commit
This will commit the rules to persistent storage and this will normally be done when the user is
satisfied with his/her current set of rules. All the above operations only apply to the temporary set
of rules and will be lost if they are not committed.
Restart firewall
Restart the firewall with the currently committed NAT rules. Please make sure you have committed
them before restarting the firewall.
Note:
•
If there are errors in one of the rules the rule number will be displayed in the output. i.e ***
Invalid nat rule <num> ***
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