@related [[unicorn]] [[Modem]] [[BeWAN]] [[PPP]]

=== MTU :===

http://forums.grenouille.com/index.php?showtopic=28461&st=15&#entry518559

http://www.hifocus.net/phpBB/viewtopic.php?t=16407&highlight=t%E9l%E92+routeur+bewan)

http://forums.grenouille.com/index.php?showtopic=9156

http://linuxfr.org/comments/447424.html#447424

Recommended Values
  * 576 : Dial-up Connections
  * 1280 : IPv6 min value
  * 1492 : PPPoE Broadband Connections
  * 1500 : Ethernet, DSL and Cable Broadband Connections

Restart Windows for the change to take effect.


http://www.speedguide.net/analyzer.php

=== [[Linux]]===
  ifconfig ppp0 mtu 1280

=== [[Windows]]===
  ping -f -l ${MTU_SIZE} ${ISP} #

Note: For Windows NT 4 the key is :

  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters


  C:\WINDOWS\Bureau>ping -l 248 -f 83.179.194.150
  Envoi d'une requête 'ping' sur 83.179.194.150 avec 248 octets de données :
  Réponse de 83.179.194.150 : octets=248 temps=1 ms TTL=128

  C:\WINDOWS\Bureau>ping -l 249 -f 83.179.194.150
  Envoi d'une requête 'ping' sur 83.179.194.150 avec 249 octets de données :
  Les paquet doit être fragmenté mais paramétré DF.


[[ClosedSource]] :
  * http://home.tiscali.de/zdata/dfuetweaker_e.htm
  * http://www.tweakmaster.com/download.php


=== [[Modem]] [[BeWAN]] [[unicorn]]===
  Browser/OS = Mozilla/5.0 (Windows; U; Win98; en-US; rv:1.7.5) Gecko/20041107 Firefox/1.0


  TCP options string = 020405b401010402
  MTU = 1500
  MTU is fully optimized for broadband.
  MSS = 1460
  Maximum useful data in each packet = 1460, which equals MSS.
  Default Receive Window (RWIN) = 64240
  RWIN Scaling (RFC1323) = 0 bits
  Unscaled Receive Window = 64240

  RWIN is a multiple of MSS
  Other values for RWIN that might work well with your current MTU/MSS:
  513920 (MSS x 44 * scale factor of 8)
  256960 (MSS x 44 * scale factor of 4)
  128480 (MSS x 44 * scale factor of 2)
  bandwidth * delay product (Note this is not a speed test):

  Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
  Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms
  MTU Discovery (RFC1191) = ON
  Time to live left = 123 hops

  TTL value is ok.
  Timestamps (RFC1323) = OFF
  Selective Acknowledgements (RFC2018) = ON
  IP type of service field (RFC1349) = 00000000 (0)


=== [[Modem]] [[BeWAN]] [[unicorn]] on [[Linux]]===

  # plog
  Aug 26 19:33:42 localhost pppd[[7955]]: Plugin pppoatm.so loaded.
  Aug 26 19:33:42 localhost pppd[[7955]]: PPPoATM plugin_init
  Aug 26 19:33:42 localhost pppd[[7955]]: PPPoATM setdevname - remove unwanted options
  Aug 26 19:33:42 localhost pppd[[7955]]: PPPoATM setdevname_pppoatm - SUCCESS:8.35
  Aug 26 19:33:42 localhost pppd[[7957]]: pppd 2.4.2 started by root, uid 0
  Aug 26 19:33:42 localhost pppd[[7957]]: Using interface ppp0
  Aug 26 19:33:42 localhost pppd[[7957]]: Connect: ppp0 <--> 8.35
  Aug 26 19:33:42 localhost pppd[[7957]]: Couldn't increase MTU to 1500

http://www.kerneltraffic.org/kernel-traffic/kt20000501_65.html