@related unicorn Modem BeWAN PPP
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
Restart Windows for the change to take effect.
ifconfig ppp0 mtu 1280
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.
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)
# 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