I change the MTU but the TCP/IP Analyzer Test says something else

[hacktek]

Hello...i have tried with every single tool i've found and still i haven't been able to change the MTU to 1500. The analyzer test says it's 1420(not optimized for broadband) and so the MSS and RWIN report as being wrong. I'm using Windows 2000 Service Pack 4...any suggestions? Thanks

[mccoffee]

Are you using any virtual private network software and or Internet connection sharring software. Also are you behind a router??

[hacktek]

Nope

[mccoffee]

What type of connection you have dsl, Dsl ppe cable. Also who is ur internet provider??

[hacktek]

I have a Cable Modem with 512/128 caps and i don't live in the US.

[mccoffee]

It could just be ur isp's mtu try this http://help.stargate.net/broadband/mtu_ping_test.shtml

[hacktek]

I already did that and found out it's 1500, but the analyzer on this page says otherwise...could it be wrong? thx

[mccoffee]

This one question may sound crazy do you got an software firewall installed if so disable it and take the analyzer again, Also do a regedit goto start menu run typed regedit click on edit and a do a find for 1420

[hacktek]

Disabled the firewall and ran the test and i still got 1420...strangely enough i couln't find 1420 in the registry but 1500 did appear. So i guess the test is wrong...

[mccoffee]

It could be that a router that is (on the isp side) between ur house and here is throwing off the analyzer.

The analyzer is usually right but it has happen that on the Isp's end that router is set for that mtu cause the resaults.

[hacktek]

Thx for the help