DNS/DHCP/NTP redundancy per founder ruling 2026-08-27:
- DHCP failover converted load-balance -> hot standby (split 255 on
primary; secondary answers only if primary unreachable >3s). DHCP
options now hand out BOTH nodes for DNS and NTP (active/active) —
Tailscale hosts stay on MagicDNS 100.100.100.100.
- netinfra-02 ntpsec deployed (pool.ntp.org, all interfaces); 01
repointed from debian pool zones to pool.ntp.org. NTP now redundant;
GPS stratum-1 on pfvsvrpi tracked as follow-up ticket.
- snmpd on both nodes with scoped ACLs (LibreNMS LAN+TS sources only)
and ntpq/dhcpd-lease extends — prep for DNS/DHCP/NTP graphing.
- Deployed sync-zones.sh (git version, DNS name instead of IP literal)
to netinfra-02; zone sync verified 171/171 zones both nodes.
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
The reservation carried a4:ba:db:0b:df:a0 (core-switch OUI, mis-migrated
from pfv-netboot) so tsys6's iDRAC could never lease its reserved address.
Replaced with the in-band-verified BMC MAC; deployed to both failover
nodes, validated, restarted.
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Assisted-by: Crush:glm-5.2
The live configs were edited in place (canonical renames, stale block
removal, 7 new reservations, 69 total) but the repo copies were never
updated — the exact drift class that bit pi-hole. Repo and live state
now match on both failover nodes.
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Assisted-by: Crush:glm-5.2
EOF
ISC DHCP server with failover-peer (primary/secondary) deployed on
pfv-netinfra-01 (192.168.3.252) and pfv-netinfra-02 (192.168.3.253). Both
servers in "normal" state, load-balancing 333 active leases.
Migration details:
- Copied all 37 host reservations + subnet/pool config from pfv-netboot
- DHCP lease database copied from netboot for zero-disruption cutover
- DNS servers changed from 192.168.3.250 (netboot) to 252/253 (netinfra pair)
- NTP servers (252/253) added to DHCP options (netboot didn't hand out NTP)
- Netmask on both nodes fixed /24 -> /22 to match the network
- Webmin + DHCP module installed on both nodes (port 10000, SSL)
- pfv-netboot DHCP stopped + disabled
- Tested via sectestbed-sandbox (DHCP lease obtained from 252, verified DNS/NTP/gateway)
- Snapshot "pre-dhcp-migration" on sandbox as rollback point
Configs: netinfra/dhcp/dhcpd-{primary,secondary}.conf
Plan + results: netinfra/dhcp-migration.md
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Assisted-by: Crush:glm-5.2
mrcharles