My P-335WT can not get an IP address from the ISP to connect to the Internet, what can I do?


Currently, there are various ways that ISPs control their users. That is, the WAN IP is provided only when the user is checked as an authorized user. The ISPs currently use three ways:

  1. Check if the 'MAC address' is valid

  2. Check if the 'Host Name' is valid, e.g., @home

  3. Check if the 'User ID' is valid, e.g., RR-Toshiba Authentication Service, RR-Manager Authentication Service

If you are not able to get the Internet IP from the ISP, check which authentication method your ISP uses and troubleshoot the problem as described below.


1. Your ISP checks the 'MAC address'

Some ISPs only provide an IP address to the user with an authorized MAC address. This authorized MAC can be the PC's MAC which is used by the ISP for authentication. So, if a new network card is used or the P-335WT is attached to the cable modem directly, the ISP will reject the DHCP discovery from this MAC, thus no IP is assigned by the ISP.

The problem can be simply solved if the ISP allows you to use a new MAC, and you just tell them the WAN MAC of the P-335WT. The WAN MAC of the P-335WT can be obtained from menu 24.1.

In case the ISP does not allow you to use a new MAC, the P-335WT can clone the MAC from the first PC you installed as the WAN MAC and send it to the ISP. To clone the MAC from the PC you need to enter that PC's IP in menu 2. Once the MAC is  received by the P-335WT, the WAN MAC in menu 24.1 will be updated. 


Menu 2 - WAN Setup

Link Mode= Half Duplex

MAC Address:
Assigned By= IP address attached on LAN
IP Address=
192.168.1.33

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Key settings:

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2. Your ISP checks the 'Host Name'

Some ISPs take advantage of the 'host name' message in a DHCP packet such as @home to do the authentication. When first installing, the ISP's tech people configure the host name as the 'Computer Name' of the PC in the 'Networking' settings. When the P-335WT is attached to the cable modem to connect to the ISP, we should configure this host name in the P-335WT's system (menu 1).

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Menu 1 - General Setup

System Name= zyxel

Key Setting:

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3. Your ISP checks 'User ID'

This authentication type is used by RoadRunner ISP, currently they use RR-TAS(Toshiba Authentication Service) and RR-Manager authentications. You must configure the correct 'Service Type', username and password for your ISP in menu 4.

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Menu 4 - Internet Access Setup

ISP's Name= ChangeMe
Service Type= RR-Toshiba Authentication Service
Server IP= 0.0.0.0
My Login=
My Password= ********

IP Address Assignment= Dynamic
IP Address= N/A
IP Subnet Mask= N/A
Gateway IP Address= N/A
RIP Direction= None
Version= N/A
Single User Account= Yes
Edit Filter Set= No


Press ENTER to Confirm or ESC to Cancel:

Key settings: