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Network Simulation

DevOps & Security
network-simulation

Network Simulation is an Agent Skill for devops & security published in the a5c-ai/babysitter repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Skill for network condition simulation, emulation, and chaos engineering

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How to use this skill

Bring this guide into your coding agent with a prompt tailored to the tool you use.

  1. Open your project in Codex.
  2. Copy and paste the prompt below.
  3. Review files and risks before approving any action.
Prompt to paste
Inspect the Agent Skill at https://github.com/a5c-ai/babysitter/blob/HEAD/library/specializations/network-programming/skills/network-simulation/SKILL.md and all supporting files. Report provenance, permissions, scripts, dependencies, and security risks. Propose an exact installation into .agents/skills/network-simulation, but wait for my approval before writing files or running scripts.

Copying this prompt does not install or run the skill. Review third-party files before use.

Network Simulation Skill

Expert skill for network condition simulation, emulation, and chaos engineering testing environments.

Capabilities

  • Traffic Control: Configure tc (traffic control) for latency, bandwidth, and packet loss simulation
  • Network Namespaces: Set up network namespaces for network isolation testing
  • WAN Emulation: Emulate WAN conditions with netem (delay, jitter, loss, corruption)
  • Virtual Topologies: Create virtual network topologies for testing
  • Packet Manipulation: Simulate packet loss, reordering, duplication, and corruption
  • Degraded Conditions Testing: Test applications under degraded network conditions
  • Chaos Scenarios: Generate chaos engineering scenarios for resilience testing
  • Container Networking: Configure Docker/Kubernetes network simulation

Tools and Dependencies

  • tc - Traffic control for Linux
  • netem - Network emulator
  • ip netns - Network namespaces
  • mininet - Network emulator
  • toxiproxy - TCP proxy for chaos testing
  • comcast - Network simulation tool
  • pumba - Container chaos testing

Target Processes

  • network-testing-framework.js
  • load-testing-tool.js
  • protocol-fuzzer.js
  • tcp-socket-server.js

Usage Examples

Latency Simulation

tc qdisc add dev eth0 root netem delay 100ms 20ms distribution normal
tc qdisc change dev eth0 root netem delay 200ms 40ms 25% correlation

Packet Loss Simulation

tc qdisc add dev eth0 root netem loss 5% 25%
tc qdisc add dev eth0 root netem loss gemodel 1% 10% 70% 0.1%

Bandwidth Limiting

tc qdisc add dev eth0 root tbf rate 1mbit burst 32kbit latency 400ms

Network Namespace Isolation

ip netns add test_ns
ip link add veth0 type veth peer name veth1
ip link set veth1 netns test_ns
ip netns exec test_ns ip addr add 10.0.0.2/24 dev veth1
ip netns exec test_ns ip link set veth1 up

Toxiproxy Chaos

toxiproxy-cli create -l localhost:6379 -u localhost:6380 redis_proxy
toxiproxy-cli toxic add -t latency -a latency=1000 redis_proxy

Quality Gates

  • Network conditions applied correctly
  • Application behavior under degraded conditions verified
  • Chaos scenarios executed successfully
  • Recovery testing completed
  • Performance baselines established