DDI: DNS / DHCP / IPAM

DNS, DHCP and IPAM are essential services on which both network and application availability depend. We focus on stability, clear ownership, security and operability in everyday practice.

What we typically deal with

  • architecture design (HLD/LLD), availability (HA) and rollback plan
  • migration and consolidation of zones, DHCP scopes and IPAM data
  • automation and integration (API) with an emphasis on change control
  • monitoring, backup of configurations and operating procedures

Why is it important?

DNS, DHCP and IPAM are services that most people only realize when they fail. When they don't work, devices can't connect to the network, apps stop working, and the impact is widespread.

Examples of problems: IP address collisions, split DNS zones leading to conflicts, DHCP without backup or missing audit of who made the change.

What it involves

  • DNS architecture: authoritative servers, resolving, split-horizon, DNS security (DNSSEC, DoH)
  • DHCP: scope-y, lease times, failover, DHCP snooping, security
  • IPAM: centralized management of IP addresses, planning, reporting
  • Integration: with Active Directory, cloud and monitoring
  • Monitoring: health checks, failover and audit of changes

Typical problems

  • Without redundancy: one DNS/DHCP server = single point of failure
  • Incorrect DHCP design: scope collisions, no documentation and clear ownership
  • DNS zones: split-brain or incorrect delegations leading to errors in resolution
  • Without automation: manual changes, errors and missing audit trail

Frequently asked questions

How long does it take to migrate DNS servers?

It depends on the size of the zones. Usually there is no need to switch everything at once — the TTL is decreased, the records are migrated, and then the NSs are switched.

How to solve DHCP failover?

Failover pair (eg ISC DHCP) or centralized IPAM/DDI tool. The minimum is reasonable redundancy and a tested outage scenario.

How do I audit changes?

Audit trail from the IPAM/DDI tool, change management process and change notifications.

How we work

Audit: mapping of existing DNS, DHCP and IPAM architecture, identification of risks.

Proposal: redundancy, failover, monitoring and migration plan.

Migration & testing: safe transfer to minimize or eliminate downtime.

Contact

If you are troubleshooting DNS, DHCP, or IPAM, or want to clean up and stabilize these services, get in touch with us.

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