[CenturyTel] Problems with PK5001Z and port forwarding
I'm having a terrible time with the ZyXEL PK5001Z modem. Actually, most everything works fine, but I cannot get port forwarding to work correctly. All outgoing connections seem to work great.
I have a few common ports set up, 22, 25, 80, 443, etc. If I run nmap against my static IP address from the network, I see port 7676 open (which I gather is "TR069 connection requests"). If I enable the remote console, I can connect via telnet or ssh, so it looks like getting through CenturyLink goes just fine. But, when I telnet into one of the ports forwarded to a server on my internal network, the connection times out.
It's hard to be absolutely certain, but it looks like when I telnet to a forwarded port that the modem sends out an ARP for my server IP (and the server responds), but I never see the SYN packet to set up the connection.
BTW, after ssh'ing into the remote console, I can telnet to the server just fine.
I have the firewall turned off. I have even put my host into the DMZ, but still have the same behaviour. The ZyXEL tech support says that it's bad hardware (which doesn't seem likely to me), and/or CenturyLink proprietary software. CenturyLink tech support says that it's ZyXEL's problem...
Any suggestions would be most welcome!
Irish SharkPlay Like A Champion TodayPremium,MVM
Las Vegas, NV
Get rid of the PK5001Z and get another brand of MODEM/router.
Skim the threads here and you will see all the issues with that hardware.
"You can observe a lot by watching". Yogi Berra