search for: tcp_challenge_ack_limit

...ijack-internet-traffic/ The article doesn't talk about CentOS or Redhat, but I assume the problem is the same, and hoping the solution is the same. However that doesn't seem to be the case. [root at vps ~]# uname -r 2.6.32-042stab108.7 [root at vps ~]# sysctl -a | grep ack_limit net.ipv4.tcp_challenge_ack_limit = 100 [root at vps ~]# vi /etc/sysctl.conf > Append > net.ipv4.tcp_challenge_ack_limit = 999999999 > to end of file [root at vps ~]# sysctl -p net.ipv4.ip_forward = 0 net.ipv4.tcp_syncookies = 1 error: permission denied on key 'net.bridge.bridge-nf-call-ip6tables' error: permiss...