How to Log IPTABLES Dropped Packets to Syslog

Simply, I want to have IPTABLES log whenever it drops a packet.

To log all dropped incoming packets, add these entries to the bottom of your IPTABLES rules:

iptables -N LOGGING
iptables -A INPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-Dropped: " --log-level 4
iptables -A LOGGING -j DROP

To log all dropped outgoing packets, add these entries to the bottom of your IPTABLES rules:

iptables -N LOGGING
iptables -A OUTPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-Dropped: " --log-level 4
iptables -A LOGGING -j DROP

To log all dropped packets, incoming and outgoing:

iptables -N LOGGING
iptables -A INPUT -j LOGGING
iptables -A OUTPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-Dropped: " --log-level 4
iptables -A LOGGING -j DROP

All items will be sent to the local syslog.

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One Response to How to Log IPTABLES Dropped Packets to Syslog

  1. in systemd monitor with:

    journalctl -kf

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