How Do You Determine Network MTU?

[Chuck]

I tried the method in Tweak 3D and it didn't work and my ISP doesn't know. Can someone provide with me a way to determine what it is it?

Also, can anyone give me some good ftp sites to use to test my settings in iSpeed?

Thanks.

[netsurfer]

well, iSpeed should read your registry and tell you your MTU packet size... typically, for a modem it's recommended you drop it to 576, with MSS at 536, and everything else is pretty much exploratory...

the location I believe is for the mtu packet size is:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\Class\Net\0000\Ndi\params\IPMTU\enum

or

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Servic es\Class\NetTrans\0000

Default MTU size is 1500, which works great on LAN's, cable modems and anything that uses a NIC...

A good ftp site to test would be the ftp server of your ISP. It's more consistent than anything else out there.

[This message has been edited by netsurfer (edited 09-10-99).]

[Chuck]

Thanks. What size file would you recommend downloading to get a good reading?

[netsurfer]

well, try a two way route.

upload a... 1 meg file, and then redownload it (unless there's already a 1 meg file free to download).

the time it takes will give you enough time to establish an average transfer rate.