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Unless you can download updates for the vulnerable packages on another system (or you have mirrored security.for local use), the system will have to be connected to the Internet for the downloads.However, as soon as you connect to the Internet you are exposing this system.

All components independently work with iptables without knowledge of how other components are using them.Below command save TPTables rulesets in /etc/sysconfig/iptables file by default and rules are applied or restored in case of IPTables flushes out.[[email protected] ~]# iptables -L -n -v Chain INPUT (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 6 396 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED, ESTABLISHED 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) pkts bytes target prot opt in out source destination 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT 5 packets, 588 bytes) pkts bytes target prot opt in out source destination[[email protected] ~]# iptables -n -L -v --line-numbers Chain INPUT (policy ACCEPT 0 packets, 0 bytes) num pkts bytes target prot opt in out source destination 1 51 4080 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED, ESTABLISHED 2 0 0 ACCEPT icmp -- * * 0.0.0.0/0 0.0.0.0/0 3 0 0 ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0 4 0 0 ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 5 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain FORWARD (policy ACCEPT 0 packets, 0 bytes) num pkts bytes target prot opt in out source destination 1 0 0 REJECT all -- * * 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited Chain OUTPUT (policy ACCEPT 45 packets, 5384 bytes) num pkts bytes target prot opt in out source destination[[email protected] ~]# iptables -L INPUT -n --line-numbers Chain INPUT (policy ACCEPT) num target prot opt source destination 1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED, ESTABLISHED 2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0 3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22 5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited View all Posts Ravi Saive I am Ravi Saive, creator of Tec Mint.If one of your local services is vulnerable, you might be compromised even before the update is finished!This may seem paranoid but, in fact, analysis from the has shown that systems can be compromised in less than three days, even if the system is not publicly known (i.e., not published in DNS records).We can use a firewall along with other safety measures to protect our servers from hackers' pries and attacks.