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I am trying to forward ports on the internal IP address in my router configuration on a remote computer on the same network. But I can't connect to the IP address. Why?

My host system is running Ubuntu server 12.04 (Precise Pangolin), and I can connect to the system's external IP address, but not the internal.

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closed as off-topic by waltinator, mikewhatever, Eric Carvalho, Braiam, Oli Feb 5 '14 at 13:21

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This is not about Ubuntu. Questions about other Linux distributions can be asked on Unix & Linux, those about Windows on Super User, those about Apple products on Ask Different and generic programming questions on Stack Overflow." – mikewhatever, Eric Carvalho, Oli
If this question can be reworded to fit the rules in the help center, please edit the question.

Welcome to askubuntu! At least to me, it's not clear what you're asking. Additionally, is strictly about Ubuntu. Please visit this brief tour: – Olli Feb 2 '14 at 20:30
Well, it is. Sorry for not specifying, the host system's ip I am trying to connect to is running Ubuntu Server 12.04. And I may get advice for use with iptables? – user240010 Feb 2 '14 at 20:41
Please, edit your question to include additional information, and more specific question – Olli Feb 2 '14 at 20:42
I understand what you're asking (I've tried to do it before) and many consumer routers will not do any forwarding from internal clients (even if you use the external IP). I think DDWRT might let you but that's another question altogether (and not one for us). – Oli Feb 5 '14 at 13:23

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