Basic server network security

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1. ?????SSH password
2. ??SSH port, ?22 ??????? Port.
3. ?? iptables ??????, ?????? port ?, ????????
4. ?? iptables??????,?????????????, ???????????????????
5. ???? Memcache ??, ??????127.0.0.1 ??, ??????????????

??:
????memcached???????DDoS??
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