ZTE ZXDSL531B Router Manual PDF (Setup & Configuration Guide)

Home

Manuals

ZXDSL531B

Page 71 / 77 Scroll up to view Page 66 - 70

Chapter 6:Troubleshooting

If you get a failed ping with the response of:

Request time out

Then the DNS is not reachable. Check your DNS setting on the ADSL Router.

Problems with Upgrading

The following lists the error messages that you may see during upgrading and the action to take.

Error

All the ADSL LEDs light up and cannot light off as usual.

Possible

cause

: When users execute firmware upgrade and save settings to the router, the power for the router is

lost for some unknown reasons, the normal web page for the router might be damaged.(see the graphic below)

After power on your router, the LEDs might not work normally.

Action

: Use the browser to connect to the router for executing image upgrade.

Error Message

: invalid checksum

Possible

cause

: The firmware file to be used is damaged or the file format is wrong.

Action

: Make sure that your firmware file format is valid or get a new firmware file.

Error Message

: invalid hardcode

Possible cause

: The firmware file is not compatible with the model of your ADSL Router.

Action

: Download a compatible firmware from the web.

Error Message

: unknown flags type

Possible cause

: The firmware version is not compatible.

Action

: Download a compatible firmware from the web.

Error Message

: internal isfs error / internal flashfs error

Possible cause

: System error occurs. It may be caused by the lack of memory.

Action

: Reboot your ADSL Router and perform the upgrade task again.

Error Message

: invalid file format

Possible cause

: The firmware file format is invalid.

Action

: Check the file format is correct, otherwise download a firmware file with correct format.

Error Message

: get an error message

Possible cause

: The TFTP server responses with error message.

Action

: Make sure the file name you enter is correct. Otherwise the TFTP server may response with the error

message “File not found”.

Page 72 / 77

ADSL Router User Manual

Error Message

: transfer time out

Possible cause

: The transfer session is interrupted.

Action

a. Make sure the TFTP server is on the same subnet with the ADSL Router.

b. Make sure you the IP address of the TFTP server you specify is correct and that your TFTP server is started.

c. If error still occurs, reboot your ADSL Router and perform the upgrade task again.

Error Message

: firmware update in process

Possible cause

: The upgrade is already in process.

Action

: Do not turn off your ADSL Router otherwise you will cause damage to the device.

Error Message

: no remote server IP

Possible cause

: The IP address of the TFTP server is not specified.

Action

: Specify the IP address of the TFTP server is not specified.

Error Message

: can’t allocate update buffer

Possible cause

: It may be caused by the lack of memory.

Action

: Reboot your ADSL Router and perform the upgrade task again.

Page 73 / 77

Chapter 6:Troubleshooting

Page 74 / 77

Chapter 7: Glossary

ARP

(

Address Resolution Protocol )

ARP

is a TCP/IP protocol for mapping an IP address to a physical machine address that is

recognized in the local network, such as an Ethernet address.

A host wishing to obtain a physical address broadcasts an ARP request onto the TCP/IP

network. The host on the network that has the IP address in the request then replies with its

physical hardware address.

Inverse ARP (In-ARP), on the other hand, is used by a host to discover its IP address. In this

case, the host broadcasts its physical address and a RARP server replies with the host's IP

address.

DHCP (Dynamic Host Configuration Protocol)

When operates as a DHCP server, the ADSL Router assign IP addresses to the client PCs on

the LAN. The client PCs “leases” these Private IP addresses for a user-defined amount of

time. After the lease time expires, the private IP address is made available for assigning to

other network devices.

The DHCP IP address can be a single, fixed public IP address, an ISP assigned public IP

address, or a private IP address.

If you enable DHCP server on a private IP address, a public IP address will have to be

assigned to the NAT IP address, and NAT has to be enabled so that the DHCP IP address can

be translated into a public IP address. By this, the client PCs are able to access the Internet.

LAN (Local Area Network) & WAN (Wide Area Network)

A LAN is a computer network limited to the immediate area, usually the same building or

floor of a building. A WAN, on the other hand, is an outside connection to another network or

the Internet.

The Ethernet side of the ADSL Router is called the LAN port. It is a twisted-pair Ethernet

10Base-T interface. A hub can be connected to the LAN port. More than one computers, such

as server or printer, can be connected through this hub to the ADSL Router and composes a

LAN.

The DSL port of the ADSL Router composes the WAN interface, which supports PPP or RFC

1483 connecting to another remote DSL device.

NAT (Network Address Translation) IP Address

NAT is an Internet standard that translates a private IP within one network to a public IP

address, either a static or dynamic one. NAT provides a type of firewall by hiding internal IP

addresses. It also enables a company to use more internal IP addresses.

If the IP addresses given by your ISP are not enough for each PC on the LAN and the ADSL

Router, you need to use NAT. With NAT, you make up a private IP network for the LAN and

assign an IP address from that network to each PC. One of some public addresses is

configured and mapped to a private workstation address when accesses are made through

the gateway to a public network.

For example, the ADSL Router is assigned with the public IP address of 168.111.2.1. With

NAT enabled, it creates a Virtual LAN. Each PC on the Virtual LAN is assigned with a private

IP address with default value of 192.168.100.2 to 192.168.2.254. These PCs are not

accessible by the outside world but they can communicate with the outside world through

the public IP 168.111.2.1.

Page 75 / 77

Glossary

Private IP Address

Private IP addresses are also LAN IP addresses, but are considered “illegal” IP addresses to

the Internet. They are private to an enterprise while still permitting full network layer

connectivity between all hosts inside an enterprise as well as all public hosts of different

enterprises.

The ADSL Router uses private IP addresses by assigning them to the LAN that cannot be

directly accessed by the Internet or remote server. To access the Internet, private network

should have an agent to translate the private IP address to public IP address.

Public IP Address

Public IP addresses are LAN IP addresses that can be considered “legal” for the Internet,

because they can be recognized and accessed by any device on the other side of the DSL

connection. In most cases they are allocated by your ISP.

If you are given a range of fixed IP addresses, then one can be assigned to the router and

the others to network devices on the LAN, such as computer workstations, ftp servers, and

web servers.

PVC (Permanent Virtual Circuit)

A PVC is a logical point-to-point circuit between customer sites. PVCs are low-delay circuits

because routing decisions do not need to be made along the way. Permanent means that the

circuit is preprogrammed by the carrier as a path through the network. It does not need to

be set up or torn down for each session.

RIP (Routing Information Protocol)

RIP is a routing protocol that uses the distance-vector routing algorithms to calculate

least-hops routes to a destination. It is used on the Internet and is common in the NetWare

environment. It exchanges routing information with other routers. It includes V1, V2 and

V1&V2, which controls the sending and receiving of RIP packets over Ethernet.

UDP (User Datagram Protocol)

UDP is a connectionless transport service that dispenses with the reliability services provided

by TCP. UDP gives applications a direct interface with IP and the ability to address a

particular application process running on a host via a port number without setting up a

connection session.

Virtual Server

You can designate virtual servers, e.g., a FTP, web, telnet or mail server, on your local

network and make them accessible to the outside world. A virtual server means that it is not

a dedicated server -- that is, the entire computer is not dedicated to running on the public

network but in the private network.

VPI (Virtual Path Identifier) & VCI (Virtual Channel Identifier)

A VPI is a 8-bit field while VCI is a 16-bit field in the ATM cell header. A

VPI

identifies a link

formed by a virtual path and a

VCI

identifies a channel within a virtual path. In this way, the

cells belonging to the same connection can be distinguished. A unique and separate VPI/VCI

identifier is assigned in advance to indicate which type of cell is following, unassigned cells,

physical layer OAM cells, metasignalling channel or a generic broadcast signaling channel.

Your ISP should supply you with the values.

Rate

Popular ZTE Models

Famous Router IPs

Famous Router Companies

Bookmark Our Site

Share