change sysctl.conf to disable tcp ecn by default (based on discussion with marek who stumbled upon this, it creates hard-to-debug connectivity issues with providers/servers that still use buggy equipment)

SVN-Revision: 16499

package/base-files/files/etc/sysctl.conf

@@ -4,7 +4,7 @@ net.ipv4.conf.all.arp_ignore=1
 net.ipv4.ip_forward=1
 net.ipv4.icmp_echo_ignore_broadcasts=1
 net.ipv4.icmp_ignore_bogus_error_responses=1
-net.ipv4.tcp_ecn=1 
+net.ipv4.tcp_ecn=0 
 net.ipv4.tcp_fin_timeout=30
 net.ipv4.tcp_keepalive_time=120
 net.ipv4.tcp_syncookies=1