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silabs-multiprotocol: Document otbr_firewall requirement on HAOS 18+ #4931

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Merged
agners merged 1 commit into from
Nov 9, 2026
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silabs-multiprotocol: Document otbr_firewall requirement on HAOS 18+ #4931

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7 changes: 7 additions & 0 deletions silabs-multiprotocol/CHANGELOG.md
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Expand Up @@ -17,6 +17,13 @@
- Declare the `/dev/net/tun` device used by OpenThread Border Router.
- The app image is unchanged from 2.4.5.

> [!WARNING]
> Known issue on Home Assistant OS 18 and later: `otbr_firewall: false` makes
> the OpenThread Border Router start script call `ip6tables-legacy`, which
> fails because the kernel no longer provides the legacy IPv6 filter table.
> `otbr-agent` then exits with code 3 in a loop and Thread stops working.
> Keep `otbr_firewall` set to `true` (the default).

## 2.4.5
- Support Home Assistant Connect ZBT-1.

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10 changes: 10 additions & 0 deletions silabs-multiprotocol/DOCS.md
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Expand Up @@ -84,6 +84,16 @@ App configuration:
| otbr_log_level | Set the log level of the OpenThread BorderRouter Agent |
| otbr_firewall | Enable OpenThread Border Router firewall to block unnecessary traffic |

> [!WARNING]
> On Home Assistant OS 18 and later, keep `otbr_firewall` set to `true` (the
> default). With the firewall disabled, the OpenThread Border Router start
> script runs `ip6tables-legacy`, which fails on these systems because the
> kernel no longer provides the legacy IPv6 filter table. The app log then
> repeats `ip6tables v1.8.7 (legacy): can't initialize ip6tables table
> 'filter': Table does not exist` and `otbr-agent exited with code 3`, Thread
> stops working while Zigbee keeps running. Re-enable the firewall and restart
> the app to recover.

## Architecture

The app runs several service internally. This architecture diagram shows what
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