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Debian GNU/Linux Reference Guide
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3.7.5 �tranges probl�mes d'acc�s � certains sites web

Les noyaux Linux r�cents activent ECN par d�faut, ce qui peut causer des probl�mes d'acc�s � certains sites web situ�s derri�re de mauvais routeurs. Pour v�rifier l'�tat d'ECN 

     # cat /proc/sys/net/ipv4/tcp_ecn
      ... ou
     # sysctl net.ipv4.tcp_ecn

Pour le d�sactiver, utilisez 

     # echo "0" > /proc/sys/net/ipv4/tcp_ecn
      ... ou
     # sysctl -w net.ipv4.tcp_ecn=0

Pour d�sactiver TCP ECN � chaque d�marrage, �diter /etc/sysctl.conf et ajouter :

     net.ipv4.tcp_ecn = 0

Debian GNU/Linux Reference Guide
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