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Ubuntu server 8.04 防火墙使用指南 (英文)

[日期:2008-09-13] 来源:Linux公社  作者:Linux [字体: ]

Create a tool for host-based iptables firewall configuration. This tool should provide an easy to use interface to the user, as well as support package integration and dynamic-detection of open ports.
Install UFW in Ubuntu
Currently this firewall package is available in Ubuntu 8.04
sudo apt-get install ufw
This will complete the installation
Turn firewall on and off (’disable’ is default ACCEPT)
# ufw enable|disable
Toggle logging
# ufw logging on|off
Set the default policy (ie “mostly open” vs “mostly closed”)
# ufw default allow|deny
Accept or drop incoming packets to (can see what services are available with ’status’ (see below)). can be specified via service name in /etc/services, ‘protocol:port’, or via package meta-data. ‘allow’ adds service entry to /etc/ufw/maps and ‘deny’ removes service entry from /etc/ufw/maps. Basic syntax:
# ufw allow|deny [service]
Display status of firewall and ports in the listening state, referencing /var/lib/ufw/maps. Numbers in parenthesis are not displayed to user
# ufw status

UFW Examples

Allow port 53
$ sudo ufw allow 53
Delete Allow port 53
$ sudo ufw delete allow 53
Allow port 80
$ sudo ufw allow 80/tcp
Delete Allow port 80
$ sudo ufw delete allow 80/tcp
Allow port smtp
$ sudo ufw allow smtp
Delete Allow port smtp
$ sudo ufw delete allow smtp
Allow fro Particular IP
$ sudo ufw allow from 192.168.254.254
Delete the above rule
$ sudo ufw delete allow from 192.168.254.254

linux
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