# Network Connectivity Issue

**Date:** 2026-01-31  
**Status:** RESOLVED  
**Severity:** Medium  

## Symptoms (Initial)

- DNS resolution failing (8.8.8.8 timeout)
- Cannot connect to local services via 192.168.31.2
- Git push to Gitea failing

## Root Causes Identified

1. **DHCP DNS misconfiguration** - All VLANs were pushing 8.8.8.8 instead of gateway IP
2. **Legacy IP references** - Old 192.168.31.x IPs no longer valid after VLAN migration
3. **Macvlan limitation** - AdGuard on macvlan (br0) unreachable from host

## Resolution

1. Updated MikroTik DHCP network settings:
   - VLAN 10: dns-server=192.168.10.1
   - VLAN 20: dns-server=192.168.20.1
   - VLAN 25: dns-server=192.168.25.1
   - VLAN 30: dns-server=192.168.30.1

2. Renewed DHCP lease on Unraid: `dhcpcd -n br0`

3. Updated NetAlertX config with correct IP (192.168.10.20)

## Verification

- DNS now resolves via 192.168.10.1 (MikroTik gateway → AdGuard)
- Git push to Gitea working
- All services accessible

## Lessons Learned

- After VLAN migration, update all hardcoded IPs
- DHCP DNS should point to gateway, not external servers
- Macvlan containers need shim interface for host communication