Help: Linksys router, DYNDNS, multiple workstation FTP Server??

[Ultra Kiasu]

I need help.

I got 2 networked PC (hostname: node1, node2) behind a Linksys WRT54G
broadband router.
I wish to configure 2 of these PC to run a FTP service to server data
files for my pocketpc.

On my Linksys router I am running the Dynamic DNS service, the IP is
assigned to a static address in the format of
username.dyndns.org

Prior to this problem, there was only one FTP service running on node1,
I was able to FTP to node1.username.dyndns.com, but after I added
another PC node, I am unable to serve successfully in both nodes.

Is there anyway to run "standard" port 21 FTP service on both nodes? I
am trying to avoid to run the additional FTP service in a non-standard
FTP port. I tried port forwarding setting in my router, and it don't
seems to work.

Is there any FTP (or similar) service can overcome this issue?

Thanks.

Kevin

 

[N. Miller]

I need help.

I got 2 networked PC (hostname: node1, node2) behind a Linksys WRT54G
broadband router.
I wish to configure 2 of these PC to run a FTP service to server data
files for my pocketpc.

On my Linksys router I am running the Dynamic DNS service, the IP is
assigned to a static address in the format of
username.dyndns.org

Prior to this problem, there was only one FTP service running on node1,
I was able to FTP to node1.username.dyndns.com, but after I added
another PC node, I am unable to serve successfully in both nodes.

Is there anyway to run "standard" port 21 FTP service on both nodes? I
am trying to avoid to run the additional FTP service in a non-standard
FTP port. I tried port forwarding setting in my router, and it don't
seems to work.

Is there any FTP (or similar) service can overcome this issue?

Thanks.

Kevin

With DynDNS, technically speaking, the host name (not address)
"username.dyndns.org" is assigned to an IP address. The assignment changes
as the IP address changes. But that is not relevant to your problem.

Your problem is in the way that NAT routers function. They can't forward
unsolicited packets to the same port on two different LAN computers; they
have no way to know which computer should be the destination. You set the
router to pass packets to port 21 on one computer, or the other. The only
way that I know of to overcome this is to set the FTP server on the second
computer to a different port, set up that port on the router, then inform
people that different files require access to different ports.