Important Concept
The service of firewall policy is defined protocol between source interface and destination interface. It might straightforward on the service configuration when setup standard protocol between two interfaces, but it might get confused when you customize port and set it on the firewall policy.
Scenario
We have a web server host internally and need to public to Internet with static WAN IP address. We don't want to use standard HTTP and HTTPs port on the internet.
Condition (All conditions below are fake value)
- Web Server Internal IP: 192.168.1.10
- Web Server Internal Service Port: HTTP(80), HTTPS(443)
- Web Service Internet IP: 8.8.8.9
- Web Service Internet Port: HTTP(9980), HTTPS(9443)
Initial Configuration
- Create new Virtual IP (VIP)
config firewall vip edit "Web Service HTTPS"
edit "Web Service HTTP"
set extip 8.8.8.9
set extintf "WAN"
set portforward enable
set mappedip 192.168.1.10
set extport 9980
set mappedport 80
next
set extip 8.8.8.9
set extintf "WAN"
set portforward enable
set mappedip 192.168.1.10
set extport 9443
set mappedport 443 - Create Custom Service
config firewall service custom
edit "TCP_9980"
set protocol TCP/UDP/SCTP
set tcp-portrange 9980
next
edit "TCP_9443"
set protocol TCP/UDP/SCTP
set tcp-portrange 9443
next - Create Firewall Policy
config firewall policy
edit 72
set srcintf "WAN"
set dstintf "Internal"
set srcaddr "all"
set dstaddr "Web Service HTTP" "Web Service HTTPS"
set action accept
set schedule "always"
set service "TCP_9980" "TCP_9443"
set logtraffic enable
next
Issue of Initial Configuration
After the setup, I tried to connect from Internet to customize port but fail. Why??
Refer to the beginning subject, "The service of firewall policy is defined protocol between source interface and destination interface."
Base on my requirement, Internet users access to my web service must connect to customized port 9980 and 9443, but between interface "WAN" and "Internal", it should be standard port of HTTP and HTTPS, that is why connection fail on the initial configuration.
Base on my requirement, Internet users access to my web service must connect to customized port 9980 and 9443, but between interface "WAN" and "Internal", it should be standard port of HTTP and HTTPS, that is why connection fail on the initial configuration.
Correct Configuration
3. Create Firewall Policy
config firewall policyedit 72
set srcintf "WAN"
set dstintf "Internal"
set srcaddr "all"
set dstaddr "Web Service HTTP" "Web Service HTTPS"
set action accept
set schedule "always"
set service "HTTP" "HTTPS"
set logtraffic enable
next
Schematic diagram
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