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Win – Rappel sur le MTU « IT Abe

Lors de session WAN via un Client TS ou un Client type VNC, vous pouvez avoir un écran noir ou encore un nombre important de déconnexions. Il se peut que cela soi lié à la taille du MTU (par défaut de taille 1500), un moyen simple de vérifier : envoyer un paquet de 1500 octets :

 Ping -f -l 1500 hostname (-f : ne fragmente pas le paquet)

 si vous n’avez aucune réponse, il peut être nécessaire de baisser la valeur en dessous de 1500.

La procédure suivante pour XP / windows 2003 (reboot nécessaire) : http://support.microsoft.com/kb/826159

Pour Windows 2008 (pas de reboot) :

netsh interface ipv4 set subinterface « Local Area Connection » mtu=1400 store=persistent

« Local Area Connection » : Nom de la cx active
mtu=1400 : taille de la MTU
store=persistent : persistent = mise en place définitive / active = seulement jqu’au prochain reboot

Source : http://www.thincomputing.net/2011/06/28/mtu-size-mismatch-a-major-cause-of-disconnections/?utm_source=twitterfeed&utm_medium=twitter&utm_campaign=Feed%3A+Thincomputingnet+%28Thincomputing.net+main+feed%29
http://communities.quest.com/community/vworkspace/blog/2011/06/14/mtu-size-mismatch-a-major-cause-of-disconnections

 Autres liens pour comprendre : http://support.microsoft.com/kb/900926                http://support.microsoft.com/kb/902347

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