Reorg: Move breezehost routing to docs/external/

docs/external/breezehost-nc1-routing.md

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+# NC1 Inter-Datacenter Routing Resolution
+
+**Date:** February 9, 2026  
+**Ticket:** #5ae82fd3  
+**Issue:** TX1 Dallas ↔ NC1 Charlotte could not communicate  
+**Resolution Time:** ~4.5 hours  
+**Status:** ✅ RESOLVED
+
+---
+
+## Problem Statement
+
+TX1 (Dallas) and NC1 (Charlotte) could not communicate directly with each other, preventing:
+- Uptime Kuma monitoring of NC1 from Command Center
+- Cross-datacenter database architecture
+- BungeeCord/Velocity proxy networks
+- Direct server-to-server backups
+
+---
+
+## Diagnostic Work
+
+**Test 1: TX1 → NC1 (Dallas to Charlotte)**
+```
+root@TX1# ping -c 4 216.239.104.130
+From 38.68.14.25 icmp_seq=1 Destination Net Unreachable
+--- 100% packet loss ---
+```
+Result: TX1's gateway immediately returned "Network Unreachable"
+
+**Test 2: NC1 → TX1 (Charlotte to Dallas)**
+```
+root@NC1# traceroute -n 38.68.14.26
+1  216.239.104.129  0.092 ms
+2  * * *
+[times out after 9 hops]
+```
+Result: Asymmetric routing - NC1 could route toward Dallas but packets timed out
+
+**Test 3: Firewall Check**
+```
+root@TX1# ufw status numbered | grep 216.239
+[no results]
+```
+Result: Not a firewall issue - pure routing problem
+
+---
+
+## Root Cause
+
+Missing routing table entry on Breezehost's infrastructure to allow inter-datacenter communication between Dallas and Charlotte facilities.
+
+---
+
+## Resolution
+
+**Breezehost Action:** "Just needed a route added on our end" - Brandon E, Feb 9, 2026
+
+**Verification:**
+```
+root@command-center# ping -c 3 216.239.104.130
+3 packets transmitted, 3 received, 0% packet loss
+```
+
+**Impact:**
+- ✅ NC1 now fully monitored by Uptime Kuma (100% uptime)
+- ✅ Cross-datacenter architecture options enabled
+- ✅ Complete infrastructure visibility
+
+---
+
+## Lessons Learned
+
+1. **Diagnostic work pays off:** Providing comprehensive test results (ping, traceroute, firewall checks) enabled fast resolution
+2. **Ask before assuming:** We assumed inter-DC isolation was intentional - it wasn't
+3. **Breezehost is responsive:** 4.5 hour turnaround on infrastructure routing changes
+4. **Document everything:** Having ticket history enables future reference
+
+---
+
+## Future Opportunities Unlocked
+
+Now that TX1 ↔ NC1 communication works, we can explore:
+- Centralized MySQL/PostgreSQL database (single instance, both datacenters)
+- BungeeCord/Velocity proxy networks (seamless player transfers)
+- Direct backup replication (NC1 → TX1 or vice versa)
+- Load balancing across datacenters
+- Failover architectures
+
+---
+
+**Breezehost Contact:** Brandon E (Staff)  
+**Appreciation:** "Like always, you guys are legends, I appreciate you" - Michael