help tweaking MTU

[gingersami]

I found about the SG analyzer a while ago and decided to run a test.
i then found out my mtu is too low (1400) and i tried tweaking it through tcp optimizer several times with no success.
I am using a wireless network with an edimax BR-6204wg connected via L2tp.
Can anyone explain how do i tweak my MTU?
Thanks in advance.

[trogers]

Log into your router and ensure MTU or MRU is set to 1500 or MSS to 1460. Save and reboot the router to take effect.

[joecool169]

Hi and welcome to speedguide.

You can go to 192.168.1.1 which is the ip address for your router.

http://members.speedguide.net/joecool169/router.jpg

You can change the mtu there. There is a manual for your router online.

Links from this page. (http://www.edimax.com.tw/html/english/products/BR-6204Wg.htm)

Try that out and see if that helps ya.:)

[gingersami]

okay, i logged to my router and changed mtu to 1492, restarted my pc and router, and still no change.

[joecool169]

okay, i logged to my router and changed mtu to 1492, restarted my pc and router, and still no change.

Did you restart you router? May need to.

[gingersami]

Did you restart you router? May need to.

did that.

[trogers]

Try the following with TCP Optimizer:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU 1500
TTL - 64
TCP Receive Window - leave blank
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - uncheck
Timestamps - uncheck

Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 1
Host Priority - 1
DNSPriority - 1
NetbtPriority - 1
Lan Browsing speedup - optimized
QoS: NonBestEffortLimit - 0
ToS: DisableUserTOSSetting - 0
ToS: DefaultTOSValue - 80
MaxNegativeCacheTtl - 0
NetFailureCacheTime - 0
NegativeSOACache Time - 0
LAN Request Buffer Size - 32768
Then select "Apply Changes" and reboot to take effect

After reboot, post a new TCP Analyzer report to see if MTU increases.

[gingersami]

« SpeedGuide.net TCP Analyzer Results »
Tested on: 09.23.2007 10:48
IP address: 89.139.xxx.xxx

TCP options string: 0204055001010402
MSS: 1360
MTU: 1400
TCP Window: 65535 (NOT multiple of MSS)
RWIN Scaling: 0
Unscaled RWIN : 65535
Reccomended RWINs: 65280, 130560, 261120, 522240
BDP limit (200ms): 2621kbps (328KBytes/s)
BDP limit (500ms): 1049kbps (131KBytes/s)
MTU Discovery: ON
TTL: 42
Timestamps: OFF
SACKs: ON
IP ToS: 01010000 (80)
Precedence: 010 (immediate)
Delay: 1 (low delay)
Throughput: 0 (normal throughput)
Reliability: 0 (normal reliability)
Cost: 0 (normal cost)
Check bit: 0 (correct)
DiffServ: AF22 010100 (20) - Assured Forwarding class 2, medium drop precedence (RFC 2597).

[trogers]

Could be that your ISP is limiting MTU to 1400.

Which country are you in?

What speed did you pay your ISP to give you?

[gingersami]

I live in israel and i pay for 1.5/mbps

[trogers]

Try the following with TCP Optimizer:

General Settings tab:
Custom settings - check
Modify All Network Adapters - check
network adapter selection - your NIC
MTU 1400
TTL - 64
TCP Receive Window - 65280
MTU Discovery - Yes
Black Hole Detect - No
Selective Acks - Yes
Max Duplicate ACKs - 2
TCP 1323 Options:
Windows Scaling - uncheck
Timestamps - uncheck

Advanced Settings tab:
Max Connections per Server - 10
Max Connections per 1.0 Server - 20
LocalPriority - 1
Host Priority - 1
DNSPriority - 1
NetbtPriority - 1
Lan Browsing speedup - optimized
QoS: NonBestEffortLimit - 0
ToS: DisableUserTOSSetting - 0
ToS: DefaultTOSValue - 80
MaxNegativeCacheTtl - 0
NetFailureCacheTime - 0
NegativeSOACache Time - 0
LAN Request Buffer Size - 32768
Then select "Apply Changes" and reboot to take effect

After reboot, test speed at this link using the recommended test server and post:

http://www.speedtest.net/

[gingersami]

http://www.speedtest.net/result/186816843.png
Thanks for your help :D