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#Cisco vpn client optimum mtu for vpn at Pc
#Cisco vpn client optimum mtu for vpn at windows

Notice that the packet still needs to be fragmented. (Figure 1)ĭrop the test packet size down (10 or 12 bytes) and test again. Notice that the packet needs to be fragmented.

#Cisco vpn client optimum mtu for vpn at windows

You can also use the Run Command by clicking on Start>Run then type in "cmd" for Windows 2000/XP/Vista or "command" for Windows 95/98/ME.Īt the DOS Prompt type in ping -f -l 1472 and hit Enter. Open a DOS prompt screen by clicking on Start>Programs>MSDOS-PROMPT.

The last four numbers are the test packet size.

"-l" is a lower case letter L, not the number one.

There is a single space between each command.

You can use any well known, pingable domain like ping -f -l xxxx in place of for the test.

The command for this ping test is ping -f -l xxxx. You will simply send out ping requests and progressively lower your packet size until the packet no longer needs to be fragmented. To find the correct MTU for your configuration you must run a simple DO S Ping test. This only applies if you are running the built in XP PPPoE client! For more information please reference this XP MTU article.

The built in PPPoE client for Windows XP uses an MTU that is set to 1480.

#Cisco vpn client optimum mtu for vpn at Pc

Additionally, some PCs may use several Network Adapters or a VPN client adapter on one PC so you must verify you are changing the Network Adapter associated with your broadband service or VPN client. If you have a network with multiple PCs every computer should be set up with the same MTU.Due to additional complications, VPNs require a different type of MTU test.More detailed information about the effects of MTU can be found here. Important Note: MTU must be 1492 (or lower) when using PPPoE connectivity. Although this simple test is accurate for testing end points, users may find that a lower MTU may be better for their particular circumstances. One of the easy and most accurate ways to test for optimum MTU is to do a simple DO S Ping test. If you have problems with both broadband and dial up access then the problem is probably something else. Since dial up uses a default MTU of 576 bytes you will not have the same problems as broadband. Helpful hint : One way to verify whether if it is an MTU problem is to try and access the application or website via dial up access.