DHCP — IP Address Management

Basic Information

Field	Value
Category	Infrastructure
Owner	Filip Kohák
Deputy	Artem Ryzhkov
SLA	24x7
Deployment	On-prem (Srv01 primary, Srv02 secondary)

Description

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses to devices on the network. We run Windows Server DHCP on domain controllers Srv01 (primary) and Srv02 (secondary) in a split-scope configuration for redundancy.

Access and Login

• DHCP console: Remote Desktop to Srv01 → Server Manager → DHCP
• Or: dhcpmgmt.msc from a domain-joined PC
• Login: domain admin account (stored in Passbolt)

Scope Structure

VLAN	Range	Purpose
VLAN 10 (Management)	10.10.10.0/24	IT management, servers
VLAN 20 (Corporate)	10.20.0.0/22	Employee PCs and laptops
VLAN 30 (Guest)	10.30.0.0/24	Guests, IoT devices
VLAN 40 (Printers)	10.40.0.0/24	Printers and copiers

Procedure — Add Static Reservation (printer/server)

1. Open DHCP console → select the appropriate Scope (VLAN)
2. Click Reservations → New Reservation
3. Fill in: Reservation Name, IP Address, MAC Address
4. Click Add

Procedure — Check Failover Status

1. DHCP console → right-click Scope → Configure Failover
2. Check failover partnership status: Srv01 ↔ Srv02
3. Status should be Normal (not Communication Interrupted)
4. Force sync: right-click Scope → Replicate Scope

Troubleshooting

Problem	Solution
Device gets APIPA (169.254.x.x)	Check DHCP relay agent on the switch/router for that VLAN; verify scope is active
IP address conflict	DHCP console → Scope → Address Leases → delete duplicate lease; on device: ipconfig /release + ipconfig /renew
Scope exhausted (100% usage)	Expand range or shorten lease time; check inactive devices with active reservations

Related Guides

• Active Directory — DHCP runs on domain controllers
• Wi-Fi AP — APs receive IPs via DHCP (reservation)

Contact

• Owner: Filip Kohák — Slack @filip
• Deputy: Artem Ryzhkov — Slack @artem
• IP assignment issues: Slack #it-help