RHEL6 で iptables を再起動すると、sysctl 設定 net.netfilter.nf_conntrack_max がデフォルトに戻される

Issue

• iptables を再起動すると、sysctl 設定 net.netfilter.nf_conntrack_max がデフォルトの 65536 に戻されます。

# cat /proc/sys/net/netfilter/nf_conntrack_max
65536
# sysctl -p
net.ipv4.ip_forward = 0
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
vm.overcommit_memory = 2
vm.overcommit_ratio = 80
net.netfilter.nf_conntrack_max = 524288
# cat /proc/sys/net/netfilter/nf_conntrack_max
524288
[root@rhel6-5 ~]# service iptables restart
iptables:Setting chains to policy ACCEPT: filter [  OK  ]
iptables:Flushing firewall rules:[  OK  ]
iptables:Unloading modules:[  OK  ]
iptables:Applying firewall rules:[  OK  ]
# cat /proc/sys/net/netfilter/nf_conntrack_max
65536