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I have Comcast business cable, and it uses the SMC networks modem. Internally, I have a link sys E4200 wifi router, and a QNap server that I want to use as an FTP server. I am able to connect to the ftp internally, and can surf the web just fine. I turned OFF the routing in the SMC, and have the E4200 acting as the router (to prevent extra NAT and whatnot). I have updated the firmware for the qnap and linksys e4200 to their latest firmware, and both have their respective DDns settings running (and both have "verified"). I have also tried setting up the port forwarding to the ones as suggested by QNAP. SMC (DHCP is OFF, port forwarding ports opened, with the address set to the linksys) > Linksys E4200 (set to handle DHCP, and has the DDNS info updated, has ports forwarded to QNAP services) > QNAP (has fixed IP, ftp services enabled, DDns updated successfully). This similar setup used to work when I had a verizon router but the SMC doesn't have anything for DDNS setups like the verizon modem did. I have also tried to add the link sys IP number to the DMZ on the comcast SMC, but no luck. Comcast said all I had to do was add the ports to the SMC and I should be fine, but it didn't work... Any ideas?! please, I'm pulling my hair out!
Answer by Cry Havok · Nov 07, 2012 at 08:03 PM
Unless you want to risk having your account blocked for abusive updates, only use one update client for each hostname. That said, please work through [this sticky]. As well as walking you through the process step by step it identifies the various things you can do to test, and what we need to know to help you effectively. I would guess however that your problem is that the SMC doesn't support bridge mode and because FTP is really NAT unfriendly it is causing you issues. You may be better off switching to SFTP if the QNAP supports it, or either making the Linksys an access point instead of a router. : http://www.dyndnscommunity.com/questions/426/how-do-i-access-my-device-from-outside-my-home-net.html