How do I port forward to a different port internally on a Linksys Router...

I don't know if this is possible but, I have a WRT54G Linksys router (with Linksys code, not hacked).  I am wanting to forward a port from the Internet to a different port on the inside.  Is this possible with the Linksys code?  If not, is it possible with some of the "modified" firmware out there and if so, which one?  Thanks.
spheretechincAsked:
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humeniukCommented:
It depends on the configuration options available to you.  I'm looking at the config screen of a WRV54G router (wireless-G VPN router - firmware 2.25.2), which includes UPnP Forwarding (under the Applications & Gaming tab).  I believe this is also available with the WRT54G router.  Other Linksys routers I've used have variations of this.

It allows you to specify an external port, an internal port, protocol used (TCP or UDP), and LAN IP address.  I have not used this feature myself, but it is supposed to allow you to forward traffic arriving on the external port to the internal port used by the specific application (ie. forward port 80 http traffic to a web server listening on port 8500).
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humeniukCommented:
Actually, I just checked the WRT54G manual (ftp://ftp.linksys.com/pdf/wrt54gv1.1_ug.pdf) and it appears that your model only allows Port Range Forwarding and DMZ setup, not UPnP Forwarding.  Neither of those will accomplish what you are looking for.
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spheretechincAuthor Commented:
Thanks,

I noticed there is a new firmware out for it but, the release notes don't say anything about being able to do that.  I know that WiFi-Box and Sveasoft have some opensource firmware for this router.  But, I don't know if those do it either.
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humeniukCommented:
I have my doubts as to whether this third-party firmware would be able to enable that specific feature, but I could be wrong.  Sveasoft, for example, boasts an extra three dozen features beyond those available with the Linksys firmware.  You may want to check out the Sveasoft forums (www.sveasoft.com/modules/phpBB2/index.php) to see if there is any info there.  If not, you could certainly ask or contact Sveasoft support.
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humeniukCommented:
Let me know what you find out.  I'd be interested in knowing what the possibilities are.
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spheretechincAuthor Commented:
Will do.  Thanks!
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