MTU-

, ,    MTU  Windows Me 
  GPRS-   "MTC"?

, ,    MTU  Windows Me 
  GPRS-   "MTC"?

      ,  , GPRS
         
 MTU,          
 Maximum Transmit Unit  .   
       
   MTU = 1500,     
   .

     -      -
    ,  -   
,        1500.   
, ,  Internet Tweak www.magellass.com.  
         Disable Auto
Discovery.

   Windows 98 / Me  :
HKEY_LOCAL_MACHINE\System\
CurrentControlSet\Services\
VxD\MSTCP
"PMTUDiscovery"="0"
  Windows 2000 / XP:
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
Tcpip\Parameters
"EnablePMTUDiscovery"=dword:00000000
   
Enable Black Hole Detect.

 Windows 98 / Me :
HKEY_LOCAL_MACHINE\System\
CurrentControlSet\Services\
VxD\MSTCP
"PMTUBlackHoleDetect"="0"

  Windows 2000 / XP:
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
Tcpip\Parameters
"EnablePMTUBHDetect"=dword:
00000000

  " " > "" (Network),  "
 " (Dial-Up Adapter)    "".  
"" (Advanced)      
IP (IP Packet Size > Large).        MTU =
1500.  ,     .    
    :
HKEY_LOCAL_MACHINE\System\
CurrentControlSet\Services\
Class\NetTrans\000x
HKEY_LOCAL_MACHINE\System\
CurrentControlSet\Services\
Class\Net\000x
HKEY_LOCAL_MACHINE\System\
CurrentControlSet\Services\
Class\Net\000x\Ndi\params\
IPMTU -  Windows 98 / Me;
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
{  }\
Parameters\Tcpip
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
Tcpip\Parameters
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
Tcpip\Parameters\Interfaces\{  } -  Windows NT /
2000 / XP.        MaxMTU, MTU, IPMTU, 
    1500.      MTU 
   , ,   
.

       Name   
: HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Control\
Network\{4D36E972-E325-11CE-BFC1-08-
002BE10318}\{  }\
Connection

      REG-  
,          .
    .
       ,  
   .    ,
       . 
     CyberKit www.cyberkit.net  IPTools
www.ks-soft.net/ip-tools.eng/index.htm   IP-  , 
     DNS-    .
    TraceRoute,     URL . 
    IP-,  , ,  
 .

       Ping   Win-dows,
   : PING -f -l 1500 ...,  ...
- IP-  ,  -I -   L,   .  
    CyberKit  IPTools:  IP  
 Ping,      1500    Don't
fragment ( ).

 ,     ,   5-6,  
   .      ( 
ping.exe  : "Packet needs to be fragmented but DF set")  
  (     ,    
    ),  ,  
     ,       
    .

, ,     ping.exe   Iskra 
    ,  1472.   , 
  MTU = 1472? ,   MTU = 1500,   ping.exe
     IP (20 )  ICMP
(8 ): 1472+28=1500. Cyber-Kit,   ,   1500, 
    28   .

   TweakDUN www.pattersondesigns.com/tweakdun/index.html,
  ,      
 .           , 
       ,     
 ,   ping.exe: 512, 568, 560, 552, 548, 536, 528,
520, 552, 576, 1006, 1024, 1152, 1524.    
 MTU    .

 ,    MTU ,     
  , ,  ,    
.  , ,  , ,   GPRS-
  MTU = 1500,     -
  1500   .

 RWIN (Receive Window -  ,  ,  
    (MSS)   ,
   , ,  )  GPRS 
 ,   - 16 ,     
 Internet Tweak.

   Windows 98 / Me   :
HKEY_LOCAL_MACHINE\System\
CurrentControlSet\Services\
VxD\MSTCP
"DefaultRcvWindow"=" "
 Windows 2000 / XP:
HKEY_LOCAL_MACHINE\SYSTEM\
CurrentControlSet\Services\
Tcpip\Parameters
"TcpWindowSize"=dword:<>

 ,  10       Windows ( 
ping.exe   ,  , ,  Norton Com-mander
 DOS),      
,          
    
