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The Netgear DGND4000 (WiFi DSL Modem Router - Premium) is an excellent router as such. Unfortunately it has a few issues that Netgear has no intention of fixing:
=Netgear DGND4000 (N750 WiFi DSL Modem Router - Premium Edition)=
DGND4000 is an excellent router as such. Unfortunately it has a few issues that Netgear has no intention of fixing:
*It forces all DNS requests to go through the routers own forwarding service. Caching of requests is disabled ($$ business feature $$), so only effect is that every DNS request takes longer to complete.
*It forces all DNS requests to go through the routers own forwarding service. Caching of requests is disabled ($$ business feature $$), so only effect is that every DNS request takes longer to complete.
*Number of concurrent connections (nf_conntrack_max) is set relatively low (compared to the routers hardware capacity)
*Number of concurrent connections (nf_conntrack_max) is set relatively low (compared to the routers hardware capacity)
Line 15: Line 16:
*Disable unnecessary services to give more free memory and cpu cycles on router
*Disable unnecessary services to give more free memory and cpu cycles on router


=Download=
{| class="wikitable"
!Date
!Version
!File
!Description
|-
|26. Januar 2014
|1.00
|http://files.subsecret.dk/RouterSetup100.jar
|Initial release (includes sourcecode)
|}


=Usage=
=Usage=
  java -jar RouterSetup100.jar ADMIN-PASSWORD
  java -jar RouterSetup100.jar ADMIN-PASSWORD


=Using telnet interface to increase download speed (unfortunately upload speed cannot be prioritized)=
=Newest official firmware=
North America: http://www.downloads.netgear.com/files/GDC/DGND4000/DGND4000_V1.1.00.14_1.00.14NA.zip<br/>
Outside North America: http://www.downloads.netgear.com/files/GDC/DGND4000/DGND4000_V1.1.00.14_1.00.14.zip
=Using telnet interface to change dsl settings=
  telnet 192.168.0.1
  telnet 192.168.0.1
Enter admin password.<br/>
Enter admin password.<br/>
Line 42: Line 59:
  Pwr(dBm):        18.6            12.9
  Pwr(dBm):        18.6            12.9
   
   
Retrain connection with focus on maximum download speed  
Retrain connection with focus on maximum download speed (use --mod m for more upload speed)
  # adslctl configure --sra on
  # adslctl configure --mod a
Wait until connection is reestablished.<br/>
Wait until connection is reestablished.<br/>
Check speed again
Check speed again
Line 64: Line 81:
  Attn(dB):        21.0            13.2
  Attn(dB):        21.0            13.2
  Pwr(dBm):        18.5            12.1
  Pwr(dBm):        18.5            12.1
 
So the speed was changed from 17915/2044 kbps to 19200/1202 kbps
=Download=
 
{| class="wikitable"
!Date
!Version
!File
!Description
|-
|26. Januar 2014
|1.00
|http://files.subsecret.dk/RouterSetup100.jar
|Initial release (includes sourcecode)
|}

Latest revision as of 13:36, 18 February 2014

Netgear DGND4000 (N750 WiFi DSL Modem Router - Premium Edition)

DGND4000 is an excellent router as such. Unfortunately it has a few issues that Netgear has no intention of fixing:

  • It forces all DNS requests to go through the routers own forwarding service. Caching of requests is disabled ($$ business feature $$), so only effect is that every DNS request takes longer to complete.
  • Number of concurrent connections (nf_conntrack_max) is set relatively low (compared to the routers hardware capacity)

Hardware specs:

  • system type: 96362ADVN2xh
  • cpu model: Broadcom4350 V7.0 (dual core)
  • MemTotal: 124296 kB
  • Kernel: Linux version 2.6.30 (root@BuildServer) (gcc version 4.4.2 (Buildroot 2010.02-git) ) #2 SMP PREEMPT Sat Feb 23 14:08:25 CST 2013


This little program will do the following:

  • Enable telnet connections on 192.168.0.1
  • Optimize kernel settings
  • Set DNS to google's DNS service
  • Disable unnecessary services to give more free memory and cpu cycles on router

Download

Date Version File Description
26. Januar 2014 1.00 http://files.subsecret.dk/RouterSetup100.jar Initial release (includes sourcecode)

Usage

java -jar RouterSetup100.jar ADMIN-PASSWORD

Newest official firmware

North America: http://www.downloads.netgear.com/files/GDC/DGND4000/DGND4000_V1.1.00.14_1.00.14NA.zip
Outside North America: http://www.downloads.netgear.com/files/GDC/DGND4000/DGND4000_V1.1.00.14_1.00.14.zip

Using telnet interface to change dsl settings

telnet 192.168.0.1

Enter admin password.
See current speed 

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    8000
Last initialization procedure status:   0
Max:    Upstream rate = 2158 Kbps, Downstream rate = 19232 Kbps
Bearer: 0, Upstream rate = 2044 Kbps, Downstream rate = 17915 Kbps   

Link Power State:       L0
Mode:                   ADSL2+ AnnexM EU-56
TPS-TC:                 ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        6.1             7.5
Attn(dB):        22.0            15.9
Pwr(dBm):        18.6            12.9

Retrain connection with focus on maximum download speed (use --mod m for more upload speed) 

# adslctl configure --mod a

Wait until connection is reestablished.
Check speed again 

# adslctl info --show
adslctl: ADSL driver and PHY status
Status: Showtime
Last Retrain Reason:    8000
Last initialization procedure status:   0
Max:    Upstream rate = 1202 Kbps, Downstream rate = 20584 Kbps
Bearer: 0, Upstream rate = 1202 Kbps, Downstream rate = 19200 Kbps

Link Power State:       L0
Mode:                   ADSL2+ 
TPS-TC:                 ATM Mode
Trellis:                U:ON /D:ON
Line Status:            No Defect
Training Status:        Showtime
                Down            Up
SNR (dB):        6.1             7.7
Attn(dB):        21.0            13.2
Pwr(dBm):        18.5            12.1

So the speed was changed from 17915/2044 kbps to 19200/1202 kbps

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