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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 at 17:23
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And the answer might be no, since iptables are used to block ports. – Basile Starynkevitch Jan 6 at 18:28
What about opening a tunnel- thats how i bypass firewalls at work.. evil laugh – ppumkin Jan 7 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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