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# Multiple Subnet Routers in the Same LAN with `--accept-routes`: Potential Issues and Solutions

When setting up multiple subnet routers in the same LAN environment with Tailscale, using the `--accept-routes` flag can cause significant connectivity issues. This document explains the problem, why it happens, and offers practical solutions.

## The Problem

Having two subnet routers in the same LAN with the `--accept-routes` flag enabled causes several networking issues:

1. **Local connectivity disruptions**: Nodes with `--accept-routes` enabled may lose the ability to communicate with other devices on the same LAN using their local IP addresses.

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root@c137:~# lspci -s 02:00.0 -vv
02:00.0 PCI bridge: ASMedia Technology Inc. ASM2812 6-Port PCIe x4 Gen3 Packet Switch (rev 01) (prog-if 00 [Normal decode])
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 17
        IOMMU group: 20
        Bus: primary=02, secondary=03, subordinate=05, sec-latency=0
        I/O behind bridge: [disabled] [32-bit]
        Memory behind bridge: 84600000-847fffff [size=2M] [32-bit]

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services:
  searxng:
    container_name: searxng
    image: docker.io/searxng/searxng:latest
    restart: unless-stopped
    ports:
      - 8080:8080
    volumes:
      - ./searxng:/etc/searxng:rw
    environment:

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---
services:
  factorio:
    image: factoriotools/factorio:2.0.8
    ports:
      - "34197:34197/udp"
      - "27015:27015/tcp"
    volumes:
      - ./factorio:/factorio
    environment:

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---
substitutions:
  name: esp32-garage-heatpump
  friendly_name: esp32-garage-heatpump

esphome:
  name: ${name}

esp32:
  board: esp32doit-devkit-v1

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{ config, pkgs, ... }:
{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  boot.kernelModules = [ "drivetemp" ];

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#######
## These results are still open to the public. See 
## https://blog.ktz.me/the-best-media-server-cpu-in-the-world/
## for analysis of them.

# https://github.com/ironicbadger/quicksync_calc

# zoidberg - dell 7040 sff pc
CPU       TEST            FILE                        BITRATE     TIME      AVG_FPS  AVG_SPEED  AVG_WATTS
i5-6600T  h264_1080p_cpu  ribblehead_1080p_h264       18952 kb/s  116.352s  29.88    1.04x      N/A

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This script sets the input and output video file paths, the codec name and profile, the encoding preset and tune, the output video resolution and frame rate, the number of encoding threads, and the number of encoding iterations. It then uses the ffmpeg command to encode the input video file using the specified codec and encoding settings, and measures the time taken using the time command. Finally, it calculates the average encoding time per iteration and prints the benchmark results.

To run this script, simply save it as a shell script file (e.g., quick_sync_benchmark.sh), make it executable (e.g., chmod +x quick_sync_benchmark.sh), and then run it (e.g., ./quick_sync_benchmark.sh). Note that you will need to have the ffmpeg command-line tool and the Intel Quick Sync Media Encoding driver installed on your Linux system in order for this script to work.

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## get interface name (ovs_eth0 below) via ip link
ip link add macvlan0 link ovs_eth0 type macvlan mode bridge
##192.168.4.204/30 (204-207)
ip addr add 192.168.4.204/30 dev macvlan0
ip link set macvlan0 up
ip route add 192.168.44.204/30 dev macvlan0

docker network create frontend

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$ docker exec -it paperless manage

Type 'manage.py help <subcommand>' for help on a specific subcommand.

Available subcommands:

[auth]
    changepassword
    createsuperuser