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Traps supported: Cold Start, Authentication Failure.

The following MIBs are supported:

•

RFC 1213 (MIB-II):

System group

Interfaces group

Address Translation group

IP group

ICMP group

TCP group

UDP group

EGP (not applicable)

Transmission

SNMP group

•

RFC1650 (EtherLike-MIB):

dot3Stats

•

RFC 1493 (Bridge MIB):

dot1dBase group

dot1dTp group

dot1dStp group (if configured as spanning tree)

•

RFC 1471 (PPP/LCP MIB):

pppLink group

pppLqr group

•

RFC 1472 (PPP/Security MIB):

PPP Security Group)

•

RFC 1473 (PPP/IP MIB):

PPP IP Group

•

RFC 1474 (PPP/Bridge MIB):

PPP Bridge Group

•

RFC1573 (IfMIB):

ifMIBObjects Group

•

RFC1695 (atmMIB):

atmMIBObjects

•

RFC 1907 (SNMPv2):

only snmpSetSerialNo OID

3.6.3.7.5 IGMP

Traditionally, IP packets are transmitted in one of either two ways - Unicast (1 sender - 1

recipient) or Broadcast (1 sender - everybody on the network). Multicast delivers IP packets

to a group of hosts on the network - not everybody and not just 1.

IGMP (Internet Group Multicast Protocol) is a network-layer protocol used to establish

membership in a Multicast group - it is not used to carry user data. IGMP version 2 (RFC

2236) is an improvement over version 1 (RFC 1112) but IGMP version 1 is still in wide use. If

you would like to read more detailed information about interoperability between IGMP version

2 and version 1, please see sections 4 and 5 of RFC 2236. The class D IP address is used to

identify host groups and can be in the range 224.0.0.0 to 239.255.255.255. The address

224.0.0.0 is not assigned to any group and is used by IP multicast computers. The address

224.0.0.1 is used for query messages and is assigned to the permanent group of all IP hosts

(including gateways). All hosts must join the 224.0.0.1 group in order to participate in IGMP.

The address 224.0.0.2 is assigned to the multicast routers group.

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The WebShare 243WM Wireless

supports both IGMP version 1 (IGMP-v1) and IGMP

version 2 (IGMP-v2). At start up, the WebShare 243WM Wireless

queries all directly

connected networks to gather group membership. After that, the WebShare 243WM Wireless

periodically updates this information. IP multicasting can be enabled/disabled on the ADSL

Router LAN and/or WAN interfaces in the web configurator (LAN; WAN). Select None to

disable IP multicasting on these interfaces.

3.6.4 SAVE Config

After changing the router’s configuration settings, you must save all of the configuration

parameters to FLASH to avoid losing them after turning off or resetting your router. Click

Save

to write your new configuration to FLASH.

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Chapter 4

Troubleshooting

If the Router is not functioning properly, you can refer first to this chapter for simple

troubleshooting before contacting your service provider. This could save you time and effort

but if the symptoms persist, then consult your service provider.

Problems Starting Up the ADSL Router

Problem

Corrective Action

None of the LEDs are

on when you turn on

the ADSL Router.

Check the connection between the adapter and the

ADSL Router. If the error persists, you may have a

hardware problem. In this case you should contact

technical support.

Problems with the WAN Interface

Problem

Corrective Action

Initialization

of

the

PVC

connection

failed.

Ensure that the cable is connected properly from the

ADSL port to the wall jack. The ADSL LED on the front

panel of the ADSL Firewall Router should be on. Check

with your VPI, VCI, type of encapsulation and type of

multiplexing settings are the same as what you

collected from your telephone company and ISP.

Reboot the WebShare 243WM Wireless . If you still

have problems, you may need to verify these variables

with the telephone company and/or ISP.

Problems with the LAN Interface

Problem

Corrective Action

Check the Ethernet LEDs on the front panel. The LED

should be on for a port that has a station connected. If it

is off, check the cables between your ADSL Router and

the station. Make sure you have uninstalled any

software firewall.

Can’t ping any station

on the LAN.

Verify that the IP address and the subnet mask are

consistent between the WebShare 243WM Wireless

and the workstations.

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APPENDIX A

Traffic Shaping

Traffic Shaping is an agreement between the carrier and the subscriber to regulate the

average rate and “burstiness” or fluctuation of data transmission over an ATM network. This

agreement helps eliminate congestion, which is important for transmission of real time data

such as audio and video connections.

Peak Cell Rate (PCR) is the maximum rate at which the sender can send cells. This

parameter may be lower (but not higher) than the maximum line speed. 1 ATM cell is 53

bytes (424 bits), so a maximum speed of 832 Kbps gives a maximum PCR of 1962 cells/sec.

This rate is not guaranteed because it is dependent on the line speed.

Sustained Cell Rate (SCR) is the mean cell rate of a bursty, on-off traffic source that can be

sent at the peak rate, and a parameter for burst-type traffic. SCR may not be greater than the

PCR; the system default is 0 cells/sec.

Maximum Burst Size (MBS) is the maximum number of cells that can be sent at the PCR.

After MBS is reached, cell rates fall below SCR until cell rate averages to the SCR again. At

this time, more cells (up to the MBS) can be sent at the PCR again. The following figure

illustrates the relationship between PCR, SCR and MBS.