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vyatta提供了强大的基于iptables的高级防火墙功能。
如果你没有定义防火墙，vyatta默认策略会禁止所有入站端口，放行所有出站。
vyatta的防火墙使用规则是这样的：
1、定义好规则模板。
2、将规则置于网卡之上生效。
比如开放http端口到公网：
- set firewall name LAN-IN rule 10 action accept
- set firewall name LAN-IN rule 10 description "allow http access from public"
- set firewall name LAN-IN rule 10 protocol tcp
- set firewall name LAN-IN rule 10 destination port http
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- 这样就放行了所有对公网的web访问
再比如要限制公网的ssh访问：
- set firewall name LAN-IN rule 20 action accept
- set firewall name LAN-IN rule 20 description "allow ssh access from some IP"
- set firewall name LAN-IN rule 20 protocol tcp
- set firewall name LAN-IN rule 20 destination port ssh
- set firewall name LAN-IN rule 20 source address 202.96.134.133
再比如限制对内某台机器的访问，譬如邮件服务器：
- set firewall name LAN-IN rule 30 action accept
- set firewall name LAN-IN rule 30 description "allow smtp access from public to mail server"
- set firewall name LAN-IN rule 30 protocol tcp
- set firewall name LAN-IN rule 30 destination port smtp
- set firewall name LAN-IN rule 30 destination address 10.0.0.8
状态防火墙：
- set firewall name STATE-RULE description "Filter traffic statefully"
- set firewall name STATE-RULE rule 1 action accept
- set firewall name STATE-RULE rule 1 state established enable
- set firewall name STATE-RULE rule 1 state related enable
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- set firewall name STATE-RULE rule 2 action drop
- set firewall name STATE-RULE rule 2 state invalid enable
- set firewall name STATE-RULE rule 2 log enable
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- commit
将上面的策略放在公网网卡上：
- set interfaces ethernet eth1 firewall in name LAN-IN
- set interfaces ethernet eth1 firewall in name STATE-RULE
注意上面的in，在vyatta的防火墙中有三条通道：
in 指的是入站。
out 指的是出站。
local 指的是防火墙本机 。
vyatta的防火墙还有基于其他策略的高级规则链，这里略过，详情参考官网文档。
（ 作者：紫色葡萄 ） | 
