3.8.5 Strange access problems with some websites
Recent Linux kernels enable ECN by default, which may cause access problems
with some websites on bad routers. To check ECN status:
# cat /proc/sys/net/ipv4/tcp_ecn
... or
# sysctl net.ipv4.tcp_ecn
To turn it off, use:
# echo "0" > /proc/sys/net/ipv4/tcp_ecn
... or
# sysctl -w net.ipv4.tcp_ecn=0
To disable TCP ECN on every boot, edit /etc/sysctl.conf and add:
net.ipv4.tcp_ecn = 0
