The host 10.21.3.69 has no H3C client, so it can't access the internet. With Tinyproxy, we can setuup a proxy server on 10.21.3.31 to enable 69 access the internet.
Server Setup
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Installation: apt-get install tinyproxy
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Configuration: vi /etc/tinyproxy.conf
i. default listening port: Port 8888
i. Allow incoming clients: Allow 10.21.3.69
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Apply the changes: sudo /etc/init.d/tinyproxy restart (or "service tinyproxy restart")
Client
Set proxy: 10.21.3.31:8888
bingo!