有些公司或機關會試著用一些防火牆和監控設備，來對公司內部同仁上網作加以控管。最常見的例子就是對 IM (MSN/Yahoo!)等作記錄或限制。如果防火牆有開放 ssh 連線，或是沒有對 HTTP Protocol 作查核，那就可以試著用 ssh 的 tcp-forwarding 來建立加密連線(secure tunnel)。
(公司外部 Server: proxy.nosuchserver.org)
1. 先架好 Proxy，例如可以 bind 在 3128 Port.
2. 設好 Firewall 規則，只開放 localhost 連線:
iptables -A INPUT -p tcp -s ! 127.0.0.1 --dport 3128 -j DROP
3. 加個帳號叫 tunnel
(公司內部 Linux: 192.168.1.10)
1. 用 ssh 登入 proxy.nosuchserver.org
ssh -L 8080:127.0.0.1:3128 tunnel@proxy.nosuchserver.org
2. 此時可以將 MSN 或 WWW-Browser 的 proxy 設定指向 127.0.0.1:8080
3. 利用此 tunnel 即可對外加密連線
如果你想讓公司內其它同事共享此 proxy，則可以利用新版 ssh 的功能:
ssh -L 192.168.1.10:8080:127.0.0.1:3128 tunnel@proxy.nosuchserver.org
那麼大夥通通把 proxy 設定指向 192.168.1.10:8080 即可。
如果對外沒開放 port 22，那就只好試著讓 Server 上的 sshd 聽 port 80 或其它開放的 port 囉。
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