Home-Networks

Network monitoring

Discover all devices connected to the local network:

#!/bin/bash
subnet="192.168.0"
for suffix in $(seq 101 199); do
    ip_address="$subnet.$suffix"
    # Only wait 1 second for each response: ping should only take a few
    # milliseconds on LAN.
    ping -c 1 -W 1 $ip_address | grep "64 bytes from $ip_address" | awk '{ print $4 }' | sed s/://
done
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Home-Networks

Home network devices

Router: Archer C20

IP Address: 192.168.0.1

MAC Address: 5C:62:8B:B6:2F:A8

Server: raspberrypi

IP Address: 192.168.0.105 (reserved on router)

MAC Address: E4:5F:01:D1:AF:9B

Workstation: homeoffice

IP Address: 192.168.0.108 (reserved on router)

MAC Address: B4:2E:99:EB:80:62

My Phone: Brad-s-S10

MAC Address: 66:01:A8:14:C5:8F

Device disappears from router’s DHCP clients list after being locked for a while.

Emma’s Phone: Emma-s-S21

MAC Address: B6:31:DF:30:AA:7E

Emma’s iPad:

MAC Address: 9A:78:52:C7:EC:00

Appears as “Unknown” on C20 router.

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Home-Networks

ISP

ISP: Aussie Broadband

Static IP: No

CGNAT: No

Opted out of CGNAT because corporate VPN couldn’t connect. Likely because multiple workers tried to connect from same CGNAT IP address at same time.

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Home-Networks

Jellyfin media server

Host: raspberrypi

Port: 8096 (Access via web browser)

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Home-Networks

Pi-hole DNS server

DNS server that supports DNS-based domain blocking.

Host: 192.168.1.105 (raspberrypi)

Port: 53

Upstream DNS server: 192.168.0.1 (i.e. ISP DNS)

Admin interface

URL using IP address: http://192.168.0.105:8080/admin/

URL using domain: http://pi.hole/admin/ (Request is routed through reverse proxy running on raspberrypi.)

Local DNS

Local network domains use .home instead of .local because .local collides with device’s built-in systems for resolving .local domains automagically.

A records

.home A records map machine domain names to their IP address.

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