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Can't telnet to cisco router from outside network. Inside works fine.

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  • Can't telnet to cisco router from outside network. Inside works fine.

    Hello all!
    I have aproblem that I'm just stuck on. I have a practice lab in my network with an access server. I have comcast and a linksys router as my firewall. I have been doing port forwarding for some time to access my computers such as rdp, ftp, etc so i'm familiar with it. I can't seem to telnet to my cisco router from the outside I have dyndns setup and its been working fine. I can't telnet wheher its by domain name or IP address. I opened ports 23 on my router and that doesn't work. I can telnet internally to my router just fine but not externally. This router has IOS 12.4 enterprise. Any help would be appreciated!!
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