NetComm NB5540 Router Manual PDF (Setup & Configuration Guide)

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NB5Plus4/W User Guide

YML754Rev1

4³

www.netcomm.com.au

The Medium and Low priority queue lengths will be proportionally calculated via the

queue weights selected in 1.) Queue Priorities above.

Total queue length for all three queues will sum to the transmit queue length set in

the system.

Packets overﬂowing their queues will be tail-dropped, penalizing stochastically the

greediest ﬂow within each queue.

Future implementations may introduce a “buffer stealing” policy. This policy will re-

move the ﬁxed buffer limits and allow a particular queue buffer to decrease to some

predeﬁned minimum limit.

De-queuing Policy

Expedited Forwarding Queue (High Priority) is always serviced ﬁrst at each packet

scheduling cycle and serviced to extinction. Therefore, the EF queue is non-preemti

-

ble by the Medium and Low priority queues.

WRR Queue Scheduler for Medium and Low priority queues

The L and M weights will be conﬁgured from the Web UI as stated above in 1.)

Queue Priorities.

A service scheduling array will be pre-computed for the Medium and Low priority

queues based on the user conﬁgurable weights assigned to these queues. Each ar

-

ray slot corresponds to a scheduling cycle. The pre-computed algorithm will allo-

cate scheduling slots for each queue based on the Medium and Low priority queue

weights and uniformly interleave them through the scheduling array. This array will

provide an O(1) scheduler with a minimum possible average latency for each of the

two queues.

Configuration:

Page 47 / 112

YML754 Rev1

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47

The weighted values used for the WRR scheduler will be calculated based on the

percentage weights the user inputs in the Web UI as stated above in 1.) Queue

Priorities.

Example: User selects a Medium Queue Weight = 60 %, and Low Queue Weight =

40%. Then the O(1) scheduling array will look like {L, M, M, L, M, M, L, M, M, L}

where L and M represents a scheduling cycle for the respective Low and Medium

queues.

Low Latency Queue (Fragmentation and Interleaving) for Voice Traffic

With Voice trafﬁc shared over same PVC with Data trafﬁc, the simple packet classiﬁ

-

cation and prioritization will not sufﬁce to achieve the low latency required by voice.

In this case, a voice call triggers dynamic ﬂushing of existing data packets from

device queues (including DSL device driver) for Head of Line Blocking removal, and

IP MTU resizing based on uplink bandwidth for fragmentation and packet interleav-

ing of voice and data. Below is an example of MTU calculations:

Total delay PSTN delay

Maximum Data Fragment size

end-to-end budget

based on upstream bandwidth (bytes)

VIF

(ms)

100kbps

150kbps

200kbps

250kbps

10ms

200

100

207

363

519

675

20ms

200

100

82

175

269

363

30ms

200

100

x

19

50

For Voice trafﬁc priority an extra EF queue was added to PRIOWRR. This extra

queue should not be exposed via WebUI conﬁg for data usage. Its use is triggered

internally by the voice app using the socket options system calls. Voice packets are

using this EF queue. Signalling for Voice uses the next EF queue that’s also exposed

on the web conﬁg. This means that voice signalling can be mixed with data if user

conﬁgures data for High Priority.

TOS-to-Priority Mapping

High Priority Marking for Expedited Forwarding Queue: DSCP Mark: xx1000

Medium Priority Marking:

DSCP Mark: xx0100

Low Priority Marking for Best Effort:

DSCP Mark: xx0000

The four TOS bits (the ‘TOS ﬁeld’) are deﬁned as:

Binary

Meaning

1000

Minimize delay (md)

0100

Maximize throughput (mt)

0010

Maximize reliability (mr)

0001

Minimize monetary cost (mmc)

0000

Normal Service

TOS

Bits

Means

Linux Priority

Queue Priority Band

0x0

0

Normal Service

0

Best Effort

2

0x2

1

Minimize Monetary Cost 1

Filler

2

Page 48 / 112

NB5Plus4/W User Guide

YML754Rev1

4´

www.netcomm.com.au

0x4

2

Maximize Reliability

0

Best Effort

2

0x6

3

mmc+mr

0

Best Effort

2

0x8

4

Maximize Throughput

2

Bulk

1

0xa

5

mmc+mt

2

Bulk

1

0xc

6

mr+mt

2

Bulk

1

0xe

7

mmc+mr+mt

2

Bulk

1

0x10

8

Minimize Delay

6

Interactive

0

0x12

9

mmc+md

6

Interactive

0

0x14

10

mr+md

6

Interactive

0

0x16

11

mmc+mr+md

6

Interactive

0

0x18

12

mt+md

4

Int. Bulk

1

0x1a

13

mmc+mt+md

4

Int. Bulk

1

0x1c

14

mr+mt+md

4

Int. Bulk

1

0x1e

15

mmc+mr+mt+md

4

Int. Bulk

1

The Default queue priority for non-mapped TOS values is Best Effort.

Advanced>LAN Clients

LAN Client names are a way of applying speciﬁc Port-forwarding and Access Con

-

trol rules to individual computers on the LAN.

If DHCP is used, all DHCP clients are

automatically assigned and are designated as a LAN client.

To add a LAN client, click Advanced>LAN Clients.

Option

Description

Select LAN Group:

Select the LAN group you would like to

add a LAN client to.

E°ter IP Address:

Enter the IP address of the LAN client to

be added.

Host°ame:

Enter the Hostname.

MAC Address:

Enter the MAC address of the new cli-

ent. To ﬁnd out the MAC address of the

client, open a command prompt and

execute an ipconﬁg/all command (Win

-

dows 2000/XP).

Note, it is optional to

add the MAC address of the device. The

format to add the MAC address is xx:xx:

xx:xx:xx:xx.

Apply:

Click Apply to save the changes.

Advanced > LAN Isolation

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YML754 Rev1

NB5Plus4/W User Guide

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4µ

You are able to restrict communication between clients in different LAN groups. If

you have the NB5Plus4 you can restrict trafﬁc between two LAN groups. If you have

the NB5Plus4W you can restrict trafﬁc between three LAN groups (Ethernet, USB,

Wireless).

Advanced > Bridge Filters

Bridge ﬁltering enables rules to be deﬁned which allow or deny data to pass through

the Router based on the source and destination Bridge address and data type of

each data frame.

To access Bridge Filters Control, click on Advanced>Bridge Filters.

Usage examples of Bridge Filter Rules are: to specify which computers on a network

are allowed Internet access; or to determine which particular computers are allowed

to access services provided by the Router (the last point is particularly relevant for

routers serving Wireless Networks as it can be used to prevent unauthorised people

from attaching themselves to a wireless LAN).

Enable/Disable Bridge Filtering

To enable Bridge ﬁltering, navigate to the Bridge Filter Control Screen and select the

Enable Bridge Filters check box.

If the check box is selected, Bridge ﬁltering is enabled according to the list of Bridge

Filter Rules that has been created.

If the box is de-selected, Bridge Filtering will not be enabled, even if Bridge Filter

Rules have been created.

Create Bridge Filter Rules

Enter the Source Bridge and Destination Bridge details.

Entering zeros or blanks

into the Source or Destination ﬁelds enters a null value.

‘Protocol’ provides the choice of protocol type for the rule.

‘Mode’ provides the choice of Allow or Deny for the rule.

When all selections are made, click on Add to add the rule to the list of rules. A

maximum of 20 Bridge Filter Rules can be deﬁned and saved.

To save changes, click on Apply.

Edit or Delete Bridge Filter Rules

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Option

Description

WAN Co°°ectio°:

Refers to the active Connection Proﬁle.

Allow I°comi°± Pi°±:

Enabling this feature allows users on

the WAN side of your modem to receive

replies to an ICMP ping command. Use-

ful for testing remote connection to your

modem.

Select LAN Group:

Select the LAN group for which you are

setting up the port forwarding rules for.

LAN IP:

Select the device (PC) to which you will

be port forwarding data to. The default

will be the LAN device currently logged

in to the modem’s web interface. For

example, if you had a web server with

IP address 192.168.1.100, you would

select this from the drop-down list.

New IP:

If you wish to manually add a LAN client

so that you can apply rules to it, click

on the New IP Button and enter Host

Name, MAC Address and IP Address.

Note: The MAC address needs to be

entered in the format xx:xx:xx:xx:xx:

xx. You do not need to enter a MAC ad-

dress.

DMZ Settings

A DMZ (demilitarized zone) is a computer host or small network inserted as ‘neutral

territory’ between a private LAN and the Internet. It prevents outside users from

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