Question about NetGear DG814 DSL Modem Internet Gateway Router

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MTU what's MTU, and how do I tweak it?

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MTU, Partial Loss of Internet Connection, and Performance MTU (Maximum Transmission Unit) is the largest packet a network device transmits. The best MTU setting for NETGEAR equipment is often just the default value. MTU is sometimes presented as something that can be easily changed to improve performance, but in practice this may cause problems. Leave MTU unchanged unless one of these situations applies: 1. You have problems connecting to your ISP or other Internet service, and their technical support (or NETGEAR's) recommends changing MTU. For example, these services may require an MTU change: * Yahoo email * MSN * AOL's DSL service 2. You use VPN, and have severe performance problems. 3. You used a program to "optimize" MTU for performance reasons, and now you have connectivity or performance problems. * An easy solution to most problems is to change MTU to 1400. * If you are willing to experiment, gradually reduce MTU as described in "Details of MTU", below. How to Change a Computer's MTU Size Note: If you change MTU on one computer, it is likely you will want to change it on your other computers, switches, and routers, as well. Instructions for changing MTU on other NETGEAR devices is found in the Reference Manuals. The third party Dr. TCP software can be used to change the MTU setting. 1. Download it from this link, choosing the zip file or the exe file at the top of the page. 2. Run the utility. 3. In the Adapter Settings pull down, select the Ethernet driver and adapter used to connect with the network. 4. In the MTU box, type the MTU size you are trying. 5. Click in any other box, without changing the data there. 6. Click Save. 7. Click Exit. 8. Restart the computer. Details About MTU A packet sent to a device larger than its MTU is broken into pieces. Ideally, MTU would be set to the same ? large ? value on all your computers, routers and switches, as well as on all the parts of the Internet that you access. But you cannot control the MTU on the Internet, and in practice the optimum MTU size on your LAN is related to your hardware, software, wireless interference, etc. * Tweaking MTU size may work well in one situation, but cause performance and connection problems in others. * When network devices with different MTU settings communicate, packets are fragmented to accommodate the one with the smallest MTU. * Windows XP sets MTU automatically, that is, it optimizes computer MTU for you. This Microsoft article explains resolving lack of connection to a broadband ISP using Windows XP: http://www.microsoft.com/windowsxp/using/networking/learnmore/ppoe.mspx * Once a network device fragments a packet, the data stays fragmented until arriving at the destination computer. Setting MTU size is a process of trial-and-error: start with the maximum value of 1500, then reduce the size until the problem goes away. Using one of these values is likely to solve problems caused by MTU size: * 1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for NETGEAR routers, adapters and switches. * 1492. The size PPPoE prefers. * 1472. Maximum size to use for pinging. (Bigger packets are fragmented.) * 1468. The size DHCP prefers. * 1460. Usable by AOL if you don't have large email attachments, etc. * 1430. The size VPN and PPTP prefer. * 1400. Maximum size for AOL DSL. * 576. Typical value to connect to dial-up ISPs.

Posted on Feb 19, 2006

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1 Answer

How do i change my mtu settinggs


To change the MTU rate on your router follow the steps below:
Open your browser, enter the IP address of your router (192.168.0.1) and click OK.
Enter your username (admin) and password (blank by default).
Click OK to enter the web configuration page for the device.
Click on Setup and then click Manual Configure.
To change the MTU enter the number in the MTU field and click Save Settings.
If changing the MTU does not resolve the problem, continue changing the MTU in increments of ten.

1500 is the default MTU for Dynamic (DHCP) Cable (p. 20 in user manual).
1492 is the default MTU for PPPoE (Point to Point Protocol over Ethernet) DSL (p. 22 in user manual).
Other MTU settings are listed in the manual, simply do a search for "MTU".

Note: AOL DSL+ users must use MTU of 1400.

To find the proper MTU Size, you'll have to do a special ping of the destination you're trying to go to. A destination could
be another computer, or a URL (p. 86 in user manual).

Here is the PDF link to the User Manual:
http://www.dlink.com/-/media/Consumer_Products/DGL/DGL%204500/Manual/DGL%204500_Manual_EN_US.pdf

Sep 20, 2011 | D-Link DGL-4500 Wireless Router

1 Answer

Not enough mtu to go to xbox live at hotel


An MTU is the largest physical packet size, measure in Bytes that a network is capable of transmitting.. If messages are larger than the MTU they are divided into smaller packets before they can be sent. All networks have different MTU's which the owner of the network set at what they want to set it at. 576 is a very common MTU if you connect through PPP. 1500 is the most common MTU for Ethernet connections. The Xbox Live system requires your network to have a certain Maximum Transmission Unit (MTU). MTU values are important to the performance of online games. If this test fails, you can adjust the MTU setting on your network router or equivalent device to resolve the problem. Xbox live requires the network you use to have a maximum MTU. This is key to online gamesing. If the MTU fails then you have to adjust the router you are using. If you cannot access the router to adjust the MTU the you will not be able to play online games.

Mar 22, 2011 | Microsoft Xbox 360 Console

3 Answers

TL WR740N can not open yahoo mail, youtube, facebook websites only google.com is working fine any help please.


TL WR740N can not open yahoo mail, youtube, facebook websites only google.com is working fine any help please.

Feb 16, 2011 | TP-LINK TL-WR740N 150Mbps Wireless Lite N...

1 Answer

Hi - do you know how to set the MTU settings on an Airlink RT210W ?


The MTU setting should already be set to 1500 this is the maximum possilbe for any TCP connection under Windows

You could use TCP Optimizer from speedguide which works by you selecting your actual download speed in kbps however the simplest solution is to use a reg tweak to optimize your ADSL connection.

http://depositfiles.com/files/7x0u7qlzq

This will set all the necessary values for you to get the most out of your tcpip.sys

NOTE: Be careful doing this can result in ADSL failure I suggest creating a drive image or a least a restore point first.

Jan 16, 2010 | Airlink Router

1 Answer

How to change mtu settings to get x box live?


heres a good site that discusses adjusting the MTU(maximum transmission unit)
Usually in most cases MTU of 1500will work just fine, I suggest using DrTCP a free program available online to help you tweak your settings


http://help.expedient.com/broadband/mtu.shtml


Dont forget to rate the advice.
http://www.aa1consulting.com

Aug 03, 2009 | Belkin Wireless G Plus MIMO (F5D9230-4)...

2 Answers

LinkedIn tanks at log in w/ Windows Vista, fine with prior operating systems


I found a solution for *my* problem, by shrinking the MTU in my router.

I have two Vista PCs at home that can't access LinkedIn's sign-in page.

I was suspicious that several browsers seemed to be having a problem, which made me think it was either a virus middleman in the network code, or a router problem. I eliminated the virus possibility by replicating the problem on another PC.

By changing the MTU on my home router from Auto to 1452, I got the signup page to appear.

It appears that Windows Vista's new TCP stack does some advanced segment and window sizing and that didn't work with my Linksys RV042 router's Auto MTU setting. I'm not 100% sure what it is about LinkedIn that caused a packet of just the wrong size, but this is the second time I had to tweak this router to work with Vista. First I needed a firmware upgrade to get some traffic flows to work at all, and now this MTU change.

I do know I've had to change MTU settings in the past to work with encapsulation protocols like PPPoE, but I haven't had to change the MTU setting for quite some time...

Maybe this clue will help someone else...

Oct 07, 2008 | Microsoft Windows XP Professional

1 Answer

M t u


In computer networking, the term Maximum Transmission Unit (MTU) refers to the size (in bytes) of the largest packet that a given layer of a communications protocol can pass onwards.
MTU parameters usually appear in association with a communications interface (NIC, serial port, etc.).
The MTU may be fixed by standards (as is the case with Ethernet) or decided at connect time (as is usually the case with point-to-point serial links).
A higher MTU brings higher bandwidth efficiency. However, large packets can block a slow interface for some time, increasing the lag on other packets. For example, a 1,500-byte packet, the largest allowed by Ethernet (and most of the Internet), would block up a 14.4k modem for about one second.
The default MTU on a PPPoE connection is 1,492. The default MTU for a DHCP or PPPoA connection is 1,500.
Increasing the MTU size beyond these levels is possible on a client computer, but not recommended, because the MTU size on the outbound connection to the ISP will nullify any potential gains from a larger MTU.

Apr 20, 2008 | Siemens SpeedStream Modem (4100) (SS4100)

2 Answers

I use Netgear DG834G with AOL9 Windows XP. Recently a number of sites are very slow to load or stop loading. I have been advised to change the MTU size to 1350. However when I try to do this the site does...


Hi,

I am surprised that that you were advised to change MTU to 1350, it should normally be 1500 or at least 1450.

Have you done a Network repair? Right click on the networking icon in your system tray and click on Repair. Alternately, you can open a command prompt and type "ipconfig /fulshdns" and hit the enter key.

I wouldn't suspect your networking since some other sites presumably loads correctly and quickly enough. Perhaps what could be done is to tweak your networking connection both on the WAN side and the LAN side. Some utilities could do this for you instead of manually working on your registry. Some examples of tried good networking utilities are DRTCP.exe and TCPOptimizer.exe. You can do a Google for their download.

Additionally, WEP and WPA security have been known to slow down WiFi connections. Further using static IP addresses in your LAN would also be of help.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Apr 01, 2008 | NetGear DG834G Router

1 Answer

I have 20mb broadband but only 300kbs download speed


I personally have never known that changing the MTU setting can speed up your connection, as the MTU is the maximum transmition units that is sent to your pc from each web site and if the MTU setting is incorrect then some web sites will not load on your explorer page, the speed at which you download the page will not make any difference.

If you are supposed to get 20MB speed then you must be on cable and not ADSL as ADSL is a max of 8MB, so i would ring up Virgin or whoever and check the speed you should really be getting.

See these details posted on the netgear site, and you'll notice there is no mention of speed:-

Details About MTU
A packet sent to a device larger than its MTU is broken into pieces. Ideally, MTU would be set to the same — large — value on all your computers, routers and switches, as well as on all the parts of the Internet that you access. But you cannot control the MTU on the Internet, and in practice the optimum MTU size on your LAN is related to your hardware, software, wireless interference, etc.
  • Tweaking MTU size may work well in one situation, but cause performance and connection problems in others.
  • When network devices with different MTU settings communicate, packets are fragmented to accommodate the one with the smallest MTU.
  • Windows XP sets MTU automatically, that is, it optimizes computer MTU for you. This Microsoft article explains resolving lack of connection to a broadband ISP using Windows XP: How-To Configure Broadband Connections Using PPPoE.
  • Once a network device fragments a packet, the data stays fragmented until arriving at the destination computer.
Setting MTU size is a process of trial-and-error: start with the maximum value of 1500, then reduce the size until the problem goes away. Using one of these values is likely to solve problems caused by MTU size:
  • 1500. The largest Ethernet packet size; it is also the default value. This is the typical setting for non-PPPoE, non-VPN connections. The default value for NETGEAR routers, adapters and switches.
  • 1492. The size PPPoE prefers.
  • 1472. Maximum size to use for pinging. (Bigger packets are fragmented.)
  • 1468. The size DHCP prefers.
  • 1460. Usable by AOL if you don't have large email attachments, etc.
  • 1430. The size VPN and PPTP prefer.
  • 1400. Maximum size for AOL DSL.
  • 576. Typical value to connect to dial-up ISPs.

Nov 22, 2007 | Microsoft Windows XP Home Edition

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