What is fabric-routing?

A guide for connecting computers on FABRIC, a programmable research testbed, using routes, encrypted WireGuard networks, or SSH-based tunnels.

Use it to configure routes between subnets, set up WireGuard VPNs, create sshuttle tunnels, or tune network and kernel settings.

It helps solve connectivity problems between FABRIC nodes without requiring the user to work out the network setup from scratch.

fabric-routing — Skill for Claude Code by fabric-testbed

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.

Any agent

npx skills add fabric-testbed/claude-plugin-marketplace --skill fabric-routing

Clone the repo

git clone --depth 1 https://github.com/fabric-testbed/claude-plugin-marketplace

Made for: Claude Code.

Or install fablib, the plugin that ships this one along with the rest of its 18 skills, 1 command.

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/skills/fabric-testbed/claude-plugin-marketplace/fabric-routing/github.svg)](https://agentmods.dev/skills/fabric-testbed/claude-plugin-marketplace/fabric-routing)

Your own site

<a href="https://agentmods.dev/skills/fabric-testbed/claude-plugin-marketplace/fabric-routing"><img src="https://agentmods.dev/badge/skills/fabric-testbed/claude-plugin-marketplace/fabric-routing/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/skills/fabric-testbed/claude-plugin-marketplace/fabric-routing"><img src="https://agentmods.dev/badge/skills/fabric-testbed/claude-plugin-marketplace/fabric-routing.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 24 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,304 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. 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	$0.00024	$0.03304
Opus 5.5	$0.00010	$0.01322
Sonnet 5.5	$0.00005	$0.00661
Haiku 4.5	$0.00002	$0.00330

Measured 2mo ago against content hash 052b46b92501, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

fabric-routing scanned grade B with 1 finding 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.

Asks for rootmediumPrivilege escalation

A mod that escalates privileges can change anything on the machine, not only the project.

node2.execute("echo 1 | sudo tee /proc/sys/net/ipv4/ip_forward")

plugins/fablib/skills/fabric-routing/SKILL.md · 345 lines

How it starts

The opening of the file, as written. The whole thing — 345 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Instructions

When invoked, generate code for routing and tunneling on FABRIC nodes. Options include:

Static Routes — Manual IP routing with IP forwarding between subnets
WireGuard VPN — Encrypted overlay network between FABRIC nodes or to external hosts
sshuttle — TCP-over-SSH tunnel for quick access without VPN setup
Performance Tuning — Network buffer and kernel parameter optimization

Ask the user what connectivity problem they're solving.

Use the modern API pattern: create networks with add_l2network(subnet=...), use iface.set_mode('auto') and net.add_interface(iface) for auto IP configuration.

API Reference

IP Routing on Nodes

# High-level route (preferred for FABnet)
node.add_route(
    subnet: IPv4Network | IPv6Network,
    next_hop: IPv4Address | IPv6Address | NetworkService,
)

# Low-level IP configuration (for manual setup)
node.ip_addr_add(addr, subnet, interface, persistent=None)
node.ip_link_up(subnet, interface)
node.ip_route_add(subnet, gateway, interface=None, persistent=None)

Patterns

Static Routes Between Subnets (Three Nodes)

from ipaddress import IPv4Network
from fabrictestbed_extensions.fablib.fablib import FablibManager

fablib = FablibManager()

slice = fablib.new_slice(name="routing-experiment")

[site1, site2, site3] = fablib.get_random_sites(count=3)

net1_subnet = IPv4Network("192.168.1.0/24")
net2_subnet = IPv4Network("192.168.2.0/24")

# Create L2 networks with subnets for auto IP
net1 = slice.add_l2network(name="net1", subnet=net1_subnet)
net2 = slice.add_l2network(name="net2", subnet=net2_subnet)

# Node1 on site1 — connected to net1
node1 = slice.add_node(name="Node1", site=site1, image="default_ubuntu_24")
iface1 = node1.add_component(model="NIC_Basic", name="nic1").get_interfaces()[0]
iface1.set_mode('auto')
net1.add_interface(iface1)

# Node2 on site2 — bridging node with interfaces on both networks
node2 = slice.add_node(name="Node2", site=site2, image="default_ubuntu_24")
iface2a = node2.add_component(model="NIC_Basic", name="nic1").get_interfaces()[0]
iface2a.set_mode('auto')
net1.add_interface(iface2a)

iface2b = node2.add_component(model="NIC_Basic", name="nic2").get_interfaces()[0]
iface2b.set_mode('auto')
net2.add_interface(iface2b)

# Node3 on site3 — connected to net2
node3 = slice.add_node(name="Node3", site=site3, image="default_ubuntu_24")
iface3 = node3.add_component(model="NIC_Basic", name="nic1").get_interfaces()[0]
iface3.set_mode('auto')
net2.add_interface(iface3)

slice.submit()

Read the full file on GitHub · 345 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 · 345 lines · 24 tokens per session scan B 052b46b92501

Subscribe to this mod's changes

fabric-routing is a skill published in the GitHub repository fabric-testbed/claude-plugin-marketplace (2 stars, last pushed 8mo ago), licensed Apache-2.0. It adds 24 tokens to every session and 3,304 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Cloud DevOps and cloud

fabric-routing next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
fabric-routingfabric-testbed/claude-plugin-marketplace	Skill	2	8mo ago	Apache-2.0	B	24	Claude Code
gke-compute-classesgoogle/skills	Skill	22k	yesterday	Apache-2.0	A	83	Claude Code, Codex
gke-reliabilitygoogle/skills	Skill	22k	yesterday	Apache-2.0	A	85	Claude Code, Codex
gke-workload-securitygoogle/skills	Skill	22k	yesterday	Apache-2.0	A	171	Claude Code, Codex
cloud-architectJeffallan/claude-skills	Skill	12k	7d ago	MIT	A	71	Claude Code
nemo-automodel-launcher-configNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	A	30	Claude Code
azure-mgmt-botservice-dotnetmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	78	Claude Code

fabric-routing