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just a quick question, is it possible to open a port on linux Centos without using iptables? If so, how do I do that from the command line?

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    define 'open a port'
    – KevinDTimm
    Jan 6, 2012 at 17:23
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    And the answer might be no, since iptables are used to block ports.
    – Basile Starynkevitch
    Jan 6, 2012 at 18:28
  • What about opening a tunnel- thats how i bypass firewalls at work.. evil laugh
    – Piotr Kula
    Jan 7, 2012 at 11:30

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If a port is blocked by iptables then it is not possible to open it without modifying iptables config. It would be a security flaw otherwise.

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