What is node-kernel-iptables?

A command that inspects IPv4 and IPv6 packet-filter rules on a Kubernetes node using iptables or ip6tables. These Linux tools control filtering, network address translation, and connection tracking.

Use it through an OpenShift debug container to list or filter packet rules on a selected node.

It lets you examine node-level network rules when pod, service, ingress, egress, or policy traffic is not behaving as expected.

node-kernel-iptables — Command for Claude Code by wangke19

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo

git clone --depth 1 https://github.com/wangke19/gemini-ai-helpers

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/commands/wangke19/gemini-ai-helpers/node-kernel-iptables/github.svg)](https://agentmods.dev/commands/wangke19/gemini-ai-helpers/node-kernel-iptables)

Your own site

<a href="https://agentmods.dev/commands/wangke19/gemini-ai-helpers/node-kernel-iptables"><img src="https://agentmods.dev/badge/commands/wangke19/gemini-ai-helpers/node-kernel-iptables/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/commands/wangke19/gemini-ai-helpers/node-kernel-iptables"><img src="https://agentmods.dev/badge/commands/wangke19/gemini-ai-helpers/node-kernel-iptables.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 12 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 2,321 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.00012	$0.02321
Opus 5.5	$0.00005	$0.00928
Sonnet 5.5	$0.00002	$0.00464
Haiku 4.5	$0.00001	$0.00232

Measured 2mo ago against content hash a54e4de75cb8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

node-kernel-iptables scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

extensions/openshift/commands/node-kernel-iptables.md · 233 lines

How it starts

The opening of the file, as written. The whole thing — 233 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Name

openshift:node-kernel-iptables

Synopsis

/openshift:node-kernel-iptables <node> <image> --command <cmd> [--table <table>] [--filter <params>]

Description

The openshift:node-kernel-iptables command allows interaction with the kernel to list packet filter rules. Iptables and ip6tables are used to inspect the tables of IPv4 and IPv6 packet filter rules in the Linux kernel.

In OVN-Kubernetes environments, iptables rules are crucial for:

Network address translation (NAT) for services
Packet filtering and security policies
Connection tracking integration
SNAT/DNAT for egress and ingress traffic
Debugging packet flow issues

The command uses oc debug to create an ephemeral container with host network access, then executes iptables operations. The image must contain iptables or ip6tables CLI utilities.

Implementation

This command invokes the openshift-node-kernel skill which provides kernel-level packet filter inspection capabilities:

Parameter Validation: Validates required node, image, and command parameters
Utility Check: Verifies the debug image contains iptables or ip6tables utilities
Command Execution: Uses oc debug to create ephemeral container and execute iptables commands
Output Filtering: Removes common oc debug warnings to provide clean output

Skill Reference:

Implementation: extensions/openshift/skills/openshift-node-kernel/node-kernel-iptables.sh
Helper functions: extensions/openshift/skills/openshift-node-kernel/kernel-helper.sh
Documentation: extensions/openshift/skills/openshift-node-kernel/SKILL.md

Parameters

Required Parameters

node: Name of the Kubernetes node where iptables rules should be extracted.
- Must be a valid node name in the cluster
- Example: ovn-control-plane, ovn-worker, worker-0
image: Container image to use for creating a debug connection to the node.
- Must contain iptables and/or ip6tables utilities
- Common images:
  - registry.redhat.io/rhel9/support-tools
  - nicolaka/netshoot

Read the full file on GitHub · 233 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 233 lines · 12 tokens per session scan A a54e4de75cb8

Subscribe to this mod's changes

node-kernel-iptables is a command published in the GitHub repository wangke19/gemini-ai-helpers (2 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 12 tokens to every session and 2,321 once invoked, about $0.0000 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Debugging Hardware and IoT extentions gemini-cli openshift redhat

node-kernel-iptables next to 6 commands from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
node-kernel-iptableswangke19/gemini-ai-helpers	Command	2	7mo ago	Apache-2.0	A	12	Claude Code
fixHimanshu507/cgcone	Command	9	yesterday	MIT	A	15	Claude Code
mqtt-debugphinn/KinetAios	Command	12	yesterday	GPL-3.0	A	23	Claude Code
issue:discovercatlog22/Claude-Code-Workflow	Command	2.1k	4mo ago	MIT	A	49	Claude Code
debug-with-filecatlog22/Claude-Code-Workflow	Command	2.1k	4mo ago	MIT	A	19	Claude Code
seed-snapshotruvnet/cognitum-claude-plugin	Command	9	6mo ago	none	A	13	Claude Code
checklistgithub/spec-kit	Command	148k	yesterday	MIT	A	13	Claude Code