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C335 Series Edge Computing Gateways | User Manual
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Firewall – Port Forwards
The forwarding sections control the traffic flow between zones and may enable MSS
clamping for specific directions. Only one direction is covered by a forwarding rule. To allow
bidirectional traffic flows between two zones, two forwardings are required, with src and
dest reversed in each.
Illustrative example on port forwarding (Forwarding port 3222 (WAN) to port 22 of LAN
host 172.18.1.174):
Description of the numbered areas
1.
Rule name
2.
Protocol (TCP/UDP/TCP + UDP are supported)
3.
External zone: WAN
4.
External port: 3222
5.
Internal zone: Select the LAN port
6.
LAN host: 172.18.1.174
7.
Target host port number of the internal zone: 22
8.
Add rules (mandatory)
Firewall – Custom Rules
Custom rules allow you to execute arbitrary iptables commands which are not otherwise
covered by the firewall framework. The commands are executed after each firewall restart,
right after the default rule settings have been loaded.
