Kubernetes Networking by James Strong & Vallery Lancey

Author:James Strong & Vallery Lancey [James Strong]
Language: eng
Format: epub
Publisher: O'Reilly Media, Inc.
Published: 2021-09-24T16:00:00+00:00

Practical Iptables

The iptables Program is IPv4-Only

There is a distinct but nearly identical program, ip6tables, for managing IPv6 rules. iptables and ip6tables rules are completely separate. E.G. dropping all packets to TPC 0.0.0.0:22 with iptables will not prevent connections to TCP [::]:22, and vice versa for ip6tables.

For simplicity, we will only refer to iptables and IPv4 addresses in this section.

Iptables Rules Don’t Persist

iptables rules aren’t persisted across restarts. iptables provides iptables-save and iptables-restore tools, which can be used manually or with simple automation to capture or reload rules. This is something that most firewall tools paper over, by automatically creating their own iptables rules every time the system starts.

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