WSL2: latency_setup.sh fails due to missing tc (traffic control) kernel module

[izzetcakmak]

Environment

• OS: Windows 11 + WSL2 (Ubuntu 24.04)
• Arc node version: v0.6.0

Problem

When running make testnet on WSL2, all validator execution
nodes fail to start with the following error:

Error: Specified qdisc kind is unknown.

This is caused by latency_setup.sh using tc (traffic control)
commands which require kernel modules not available in WSL2.

Steps to reproduce

1. Clone arc-node on a Windows machine with WSL2
2. Run make testnet
3. All validator*_el containers fail with exit code 1

Workaround

Replace the contents of each latency_setup.sh with:

#!/usr/bin/env bash
echo "Latency emulation skipped (not supported)"
exit 0

Files affected:

• .quake/localdev/validator1/latency_setup.sh
• .quake/localdev/validator2/latency_setup.sh
• .quake/localdev/validator3/latency_setup.sh
• .quake/localdev/validator4/latency_setup.sh
• .quake/localdev/validator5/latency_setup.sh
• .quake/localdev/full1/latency_setup.sh

Suggestion

Add a WSL2 detection check in latency_setup.sh and skip
tc commands gracefully when running on WSL2.

[giwaov]

I’d like to take this one if it’s available.

Could this be assigned to me before I start? I’ll wait for confirmation before opening a PR.

[Jr-kenny]

I can take this with a small scoped fix: detect WSL2 in the generated latency_setup.sh and skip tc-based latency emulation there with a clear message, while preserving the existing behavior on regular Linux hosts. I’ll open a PR for that path.