Before using web-based system administration tool, Webmin, it’s necessary to either stop firewall or allow a special UDP port. However, RHEL3.4 GUI interface, redhat-config-securitylevel doesn’t provide configuring speical port. Thus, i’ve to configure firewall using text-based iptables.
First, use
iptables -L to list existing firewall policies. Then use
iptables -A …
to amend policies. Finally, use
iptables-save-c
to update policies to iptables config. file.
After opening the port, i can enjoy using this powerful and user-friendly system admin. tools over the web. With this exercise, configuration of iptables is learned naturally.
