[root@ol-yum-repo init.d]#  service iptables start 
iptables: Applying firewall rules: Another app is currently holding the xtables lock. Perhaps you want to use the -w option?
                                                           [FAILED]

[root@ol-yum-repo init.d]#  iptables-restore /etc/sysconfig/iptables 
Another app is currently holding the xtables lock. Perhaps you want to use the -w option?

[root@ol-yum-repo init.d]#  cat /etc/init.d/iptables.start 
#!/bin/bash

[ -f /etc/sysconfig/iptables-config ] && . /etc/sysconfig/iptables-config

while read r
do
    echo $r | egrep '^-' >/dev/null
    rc=$?
    if [ $rc -eq 0 ]
    then
        iptables $r
    fi
done < /etc/sysconfig/iptables
[root@ol-yum-repo init.d]#  sh /etc/init.d/iptables.start 
[root@ol-yum-repo init.d]#  service iptables status 
Table: filter
Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination
1    ACCEPT     tcp  --  192.168.0.0/16       0.0.0.0/0           tcp dpt:80
2    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0           state RELATED,ESTABLISHED
3    ACCEPT     icmp --  0.0.0.0/0            0.0.0.0/0
4    ACCEPT     all  --  0.0.0.0/0            0.0.0.0/0
5    ACCEPT     tcp  --  0.0.0.0/0            0.0.0.0/0           state NEW tcp dpt:22
6    REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination
1    REJECT     all  --  0.0.0.0/0            0.0.0.0/0           reject-with icmp-host-prohibited

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination

[root@ol-yum-repo init.d]#  cat /etc/*elease* 
Oracle Linux Server release 6.8
NAME="Oracle Linux Server"
VERSION="6.8"
ID="ol"
VERSION_ID="6.8"
PRETTY_NAME="Oracle Linux Server 6.8"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:oracle:linux:6:8:server"
HOME_URL=" https://linux.oracle.com/" 
BUG_REPORT_URL=" https://bugzilla.oracle.com/" 

ORACLE_BUGZILLA_PRODUCT="Oracle Linux 6"
ORACLE_BUGZILLA_PRODUCT_VERSION=6.8
ORACLE_SUPPORT_PRODUCT="Oracle Linux"
ORACLE_SUPPORT_PRODUCT_VERSION=6.8
Red Hat Enterprise Linux Server release 6.8 (Santiago)
Oracle Linux Server release 6.8
cpe:/o:oracle:linux:6:8:server

[root@ol-yum-repo init.d]#  yum info iptables 
Loaded plugins: ulninfo
Installed Packages
Name        : iptables
Arch        : x86_64
Version     : 1.4.7
Release     : 16.0.3.el6
Size        : 856 k
Repo        : installed
From repo   : ol6_latest
Summary     : Tools for managing Linux kernel packet filtering capabilities
URL         :  http://www.netfilter.org/ 
License     : GPLv2
Description : The iptables utility controls the network packet filtering code in the
            : Linux kernel. If you need to set up firewalls and/or IP masquerading,
            : you should install this package.