Hi,
I am new, and I sure hope that someone can explain to me what is happening. First of all my setup. As I am involved with highly confidential information, I work behind a double NAT, ISPs modem/router (192.168.1.1) and a Linksys E4200 (192.168.0.1) connected with WAN to 1st router's LAN. In my subnet I have a Synology DS212+ NAS, with static local IP.
Ports with which I had no issue forwarding are 21, 22, 23, 25, 80, 110, 139, 445, 5000, 5001, but for 139 and 445 I had to disable the firewall.
Ports that won't budge are 143, 443, 873, 5005, 5006, 7000, 7001, 137, 138, 1723 and 1194. I have tested the 2 routers separately, and in double NAT, and result is the same. The ports stay closed on both routers.
I have spend time on the phone with Linksys tech support, but no response. I have talked to the ISP's tech support multiple times, but the people there don't even know what a NAS is used for. One time they hang up on me, another time they told me to research the internet. I sure hope that we have on this forum some experts that are motivated enough to take this challenge and help it being resolved.
Looking forward to reactions, and a big thanks in advance.
Unable to forward specific ports
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- Newbie
- Posts: 1
- Joined: Sun Jan 29, 2012 2:51 pm
Re: Unable to forward specific ports
Not sure what double nat has to with confidentiality - you need secure comms via vpn to encrypt traffic end-to-end.
Double-nat is a big problem with port forwarding as you need to add compatible port forwarding on both routers - not sure what device you have "disabled the firewall" because routers often use the iptables netfilter 'firewall' to implement port forwarding - to bypass the firewall you should try to use a dmz on both, if available.
You can't port-forward onto ports in use - the E4200 has usb ports and can act as NAS as well can't it - so it may be trying to offer services in conflict with your NAS? There is 3rd party firmware available for the E4200 - they may give you more control - assuming you can get past ISP modem/router.
Double-nat is a big problem with port forwarding as you need to add compatible port forwarding on both routers - not sure what device you have "disabled the firewall" because routers often use the iptables netfilter 'firewall' to implement port forwarding - to bypass the firewall you should try to use a dmz on both, if available.
You can't port-forward onto ports in use - the E4200 has usb ports and can act as NAS as well can't it - so it may be trying to offer services in conflict with your NAS? There is 3rd party firmware available for the E4200 - they may give you more control - assuming you can get past ISP modem/router.