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Chapter 5:Troubleshooting
Chapter 5: Troubleshooting
If the suggested solutions in this section do not resolve your issue, contact your system administrator
or Internet service provider.
Problems with LAN
PCs on the LAN cannot get IP addresses from the ADSL Router.
The chances are that the interface used as DHCP server is modified and the client PCs do not renew
IP addresses.
If your DHCP server is enabled on Private IP Address previously and you modify the interface to
Public IP Address, the client PCs should renew IP addresses.
The PC on the LAN cannot access the Web page of the ADSL Router.
Check that your PC is on the same subnet with the ADSL Router.
The virtual server can’t be access after setting virtual server.
Check the filter rule of the port that virtual server service setting for example, the virtual server
service set FTP 21 you need update the filter rule of the ftp 21
Direction
setting
:
Choose
filter the
packets that incoming action (In Bound) are
Allow
on the interface.
Problems with WAN
You cannot access the Internet.
±
Check the physical connection between the ADSL Router and the LAN.
If the LAN LED on the front panel is off or keeps blinking, there may be problem on the cable
connecting to the ADSL Router.
At the DOS prompt, ping the IP address of the ADSL Router, e.g, ping 192.168.1.1. If the
following response occurs:
Relay from 192.168.1.1 bytes=32 time=100ms TTL=253
Then the connection between the ADSL Router and the network is OK.
If you get a failed ping with the response of:
Request time out
Then the connection is fail. Check the cable between the ADSL Router and the network.
±
Check the DNS setting of the ADSL Router.
At the DOS prompt, ping the IP address of the DNS provided by your ISP. For example, if your
DNS IP is 168.95.1.1, then ping 168.95.1.1. If the following response occurs:
Relay from 168.95.1.1 bytes=32 time=100ms TTL=253
Then the connection to the DNS is OK.
If you get a failed ping with the response of:
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ADSL Router User Manual
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. 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
:
Image uploading failed. The selected file contains an illegal image.
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
: Image uploading failed. The system is out of memory.
Possible cause
: It may be caused by the lack of memory.
Action
: Reboot your ADSL Router and perform the upgrade task again.
±
Error Message
: Image uploading failed. No image file was selected.
Possible cause
: You did not select a file correctly.
Action
: Download a compatible firmware from the web.
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Chapter 6: Glossary
Chapter 6: 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
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ADSL Router User Manual
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 192.168.1.2 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.
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 turned 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,
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Chapter 7: Glossary
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, metasignaling channel or a generic broadcast
signaling channel. Your ISP should supply you with the values.
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