---
title: 'Fix docker causing qemu forwarding to fail'
url: 'https://grav.munn.me/my-blog/fix-docker-causing-qemu-forwarding-to-fail'
markdown: 'https://grav.munn.me/my-blog/fix-docker-causing-qemu-forwarding-to-fail.md'
date: '2025-08-13'
description: "I had this problem where docker would break qemu when it started. I found some things that claimed to fix it but they didn't. Here is the correct solution: EDITOR=vim sudo -E systemctl edit docker ExecStopPost=/usr/bin/iptables -D FORWARD -p all -i bridge0 -j ACCEPT ExecStartPre=/usr/bin/iptables -…"
---

# Fix docker causing qemu forwarding to fail

I had this problem where docker would break qemu when it started. I found some things that claimed to fix it but they didn't. Here is the correct solution:

```bash
EDITOR=vim sudo -E systemctl edit docker
ExecStopPost=/usr/bin/iptables -D FORWARD -p all -i bridge0 -j ACCEPT
ExecStartPre=/usr/bin/iptables -P FORWARD ACCEPT
```

---

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