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Expand LAN to 10.0.0.0/22 with static/reserved/dynamic/spare zones

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Splits the LAN into four /24 zones: 10.0.0.0/24 static (no DHCP, DNS
only), 10.0.1.0/24 fixed DHCP reservations by MAC, 10.0.2.0/24 dynamic
DHCP pool, 10.0.3.0/24 spare/unused. ipadm now derives the required
subnet from whether a host has a MAC, auto-assigns free IPs, and
auto-migrates a host's IP when its MAC is added/removed. Migrated the
existing archerc80 reservation from 10.0.0.2 to 10.0.1.2.

Also fixes a latent bug found while doing this: dnsmasq's SIGHUP
(`systemctl reload`) only re-reads /etc/hosts, not the conf-dir files
ipadm writes to, so config changes were silently not applied on
reload. ipadm now restarts dnsmasq instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
mike
2026-08-21 08:57:58 +02:00
co-authored by Claude Sonnet 5
parent 78beedeabc
commit c135f205fa
10 changed files with 364 additions and 112 deletions
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config/dnsmasq.d/lan.conf
+9 -2
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@@ -4,8 +4,15 @@ bind-interfaces
except-interface=enp3s0
except-interface=lo
# DHCP für 10.0.0.0/24
dhcp-range=10.0.0.100,10.0.0.200,255.255.255.0,12h
# DHCP für 10.0.0.0/22, aufgeteilt in vier /24er:
# 10.0.0.0/24 statische Adressen (kein DHCP, nur DNS via ipadm)
# 10.0.1.0/24 feste DHCP-Reservierungen anhand MAC-Adresse (via ipadm, siehe hosts.conf)
# 10.0.2.0/24 dynamischer Pool für alle anderen Clients (dieser dhcp-range)
# 10.0.3.0/24 Reserve, aktuell unbenutzt
# Ein dhcp-range genügt: die Netzmaske definiert das gesamte /22 als ein
# DHCP-Netz, dhcp-host-Reservierungen (hosts.conf) außerhalb dieses Bereichs
# funktionieren trotzdem, solange sie im selben /22 liegen.
dhcp-range=10.0.2.10,10.0.2.250,255.255.252.0,12h
dhcp-option=option:router,10.0.0.1
dhcp-option=option:dns-server,10.0.0.1
dhcp-authoritative