使用 linux 作 firewall
我可以使用 Outlook Express 经由 linux firewall 从 pop.mail.yahoo.com 收信，
却无法从 smtp.mail.yahoo.com 寄信，请问是什么原故？
Linux firewall 是以如下命令达成。
iptables -t nat -L POSTROUTING -o ppp0 -j MASQUERADE
所有的 chains 的预设 policy 都是 ACCEPT。
我的 ADSL 是动态配置 IP 的。而 Linux kernel 是 2.4.12-586tsc。
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