Moxa IA261-I-LX Инструкция по эксплуатации онлайн [38/71] 170911

IA260-261-262 EM-2260 LX User’s Manual Managing Communications

Examples:

Example 1: Accept all packets from lo interface.

# iptables –A INPUT –i lo –j ACCEPT

Example 2: Accept TCP packets from 192.168.0.1.

# iptables –A INPUT –i eth0 –p tcp –s 192.168.0.1 –j ACCEPT

Example 3: Accept TCP packets from Class C network 192.168.1.0/24.

# iptables –A INPUT –i eth0 –p tcp –s 192.168.1.0/24 –j ACCEPT

Example 4: Drop TCP packets from 192.168.1.25.

# iptables –A INPUT –i eth0 –p tcp –s 192.168.1.25 –j DROP

Example 5: Drop TCP packets addressed for port 21.

# iptables –A INPUT –i eth0 –p tcp --dport 21 –j DROP

Example 6: Accept TCP packets from 192.168.0.24 to IA260/IA261/IA262/EM-2260’s port 137,

138, 139

# iptables –A INPUT –i eth0 –p tcp –s 192.168.0.24 --dport 137:139 –j ACCEPT

Example 7: Log TCP packets that visit IA260/IA261/IA262/EM-2260’s port 25.

# iptables –A INPUT –i eth0 –p tcp --dport 25 –j LOG

Example 8: Drop all packets from MAC address 01:02:03:04:05:06.

# iptables –A INPUT –i eth0 –p all –m mac –mac-source 01:02:03:04:05:06 –j DROP

NOTE: In Example 8, remember to issue the command

#modprobe ipt_mac

first to load module

ipt_mac.

NAT

NAT (Network Address Translation) protocol translates IP addresses used on one network to

different IP addresses used on another network. One network is designated the inside network and

the other designated the outside network. Typically, the IA260/IA261/IA262/EM-2260 connects

several devices on a network and maps local inside network addresses to one or more global

outside IP addresses, and un-maps the global IP addresses on incoming packets back into local IP

addresses.

NOTE Click on the following link for more information about iptables and NAT:

http://www.netfilter.org/documentation/HOWTO/NAT-HOWTO.html

4-11