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dsl problem

first i have 256k adsl
alcatel speedtouch 510 adsl router
i am suffering high pings in mutiplayer games
i used to have 100-150 pings
suddenly i have 250-400 pings which is really slow
i thought of the mtu size
so as to change it
i used the method of opening a command prompt windows and writing the command
ping xxx.xxx.xxx.xxx -f -l (wanted mtu size)
until i get no (packet needs to be fragmanted nut df set
and then i change the mtu size from windows registery
i tried it last night it worked and i had a 100 ping
but this moring it returned so i made the method again and found that the mtu size that was good yesterday not good today so i find new one (lower offcouse) and set it and restart windows
no change in pings
so i return again to cmd window
and i find that the mtu size that was good before restart isn't now working
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1 Solution
Has the value changed in your registry from what you set it to previously?  The only thing that you are changing is the maximum size transmission before an acknowledgment is sent.  Most DSL and DOCSIS modem/routers have configuration files loaded to them by the provider of service.

Your best chances are to do research on the modem/router you have and find out the underlying technology (IOS) and how it is configured.  Most have ways to thwart the transmission.
Anyone3003Author Commented:
no it didn't change in the reg
i found the CLI guide of the router but i didn't find how to change the mtu size
there is some changes now
i noticed that the ping is 90-150ms from 6 am to 12 am every day and the rest of the day the ping is 250-350ms
what drives me crazy that the download speed is stable all day so my isp don't care  cuz they only care about the download speed
It is probably an isp issue. Install http://www.pingplotter.com and collect enough data to confront your isp.
Man, it almost sounds as if you had a shared medium (like cable broadband), but I know DSL is not that type of medium.  Perhaps there are exposed lines, or excessive noise on the lines.  What is the contracted download speeds?  Your one advantage with having DSL is that you must lock into a contracted rate, and if you do not meet the promised rates, they must fix it and/or refund.  Whereas with cable it is a shared medium, and part of the disclaimer is the terminology "up to {speed}".  Check it out...  I would really push the issue, much like any other "customer serviceā€, the squeaky wheel gets the grease, and they sure as hell would not waste any time to ding you on an early cancellation fee, so why except less than stellar service?
With further reading, mostly noticing the ping times in your statement versus download times, the ping time are ridiculous... especially from service to head-end.  50ms should be your max even if you were on the edge of a node.  You must be on some old shitty cable that they do not see a financial benefit to upgrading or replacing.

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