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For example:
# iptables -I INPUT -p tcp --dport 23 -m state --state \ ESTABLISHED,RELATED -j ACCEPT
This tells the firewall to accept incoming Telnet traffic for previously established Telnet sessions.
If the rule is created in IPv6 > New Firewall Rule, it is the equivalent of running one of the following at a shell-prompt:
# ip6tables -m state --state NEW
# ip6tables -m state --state ESTABLISHED,RELATED
For example:
# ip6tables -I INPUT -p tcp --dport 23 -m state --state \ ESTABLISHED,RELATED -j ACCEPT
As with the iptables example, this tells the firewall to accept incoming Telnet traffic for previously established Telnet sessions.
For more on iptables, ip6tables and iptables-extensions, see the respective manual pages: iptables, ip6tables and iptables-
extensions.
CHAPTER 6: FIREWALL, FAILOVER AND OOB ACCESS
