Troubleshooting Linux Firewalls
Because Linux firewalls lack the support component of their commercial counterparts, up until this point users have had to resort to mailing lists to solve their problems; however, gathered here are the most often encountered problems in Linux firewalling, compiled from firewall mailing lists, along with a diagnostic approach to solving these problems. Original.
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Local Firewall Security
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ACCEPT SIPTABLES ACCEPT udp allow assets attack bytes chain chapter chroot client configuration connection tracking conntrack create default DHCP DNAT dport 80 DROP SIPTABLES ebtables eth2 ethl ethO example external interface firewall rules FORWARD d SIPTABLES FORWARD i SEXTERNAL FORWARD p tcp host Host-B ICMP INPUT p tcp internal network Internet IP address IP Forwarding ipchains IPSEC kernel Layer Linux kernel LOG log-level info log-ip-options log-prefix MAC address modprobe module nat A PREROUTINC netfilter netfilter/iptables NEW,ESTABLISHED,RELATED j ACCEPT nmap openswan options OSI model outbound patch ping port PPTP problem protocol proxy server Redhat REDIRECT risk management route ruleset running scan SELinux SEXTERNAL o SDMZ SEXTERNAL p tcp SIPTABLES A FORWARD SIPTABLES A INPUT SIPTABLES t nat SMTP sniffer switch target prot opt tcp m tcp TCP wrappers tcpdump to-destination traceroute traffic troubleshooting users