ISP Testing - Quick Reference Guide¶

TL;DR¶

Configuration: Technicolor DGA4135NLK in BRIDGE MODE Impact: None (transparent, layer-2 only) Firewall Changes: NONE required Implementation: 15 minutes Rollback: 5 minutes (just unplug)

Pre-Implementation Checklist¶

# Backup UCG config
ssh root@REDACTED_IP
# Via UniFi UI: Settings → System → Backup → Download

# Verify monitoring is running
ssh root@REDACTED_IP8
systemctl status isp-monitor  # or: pgrep -f enhanced_monitor.py

# Note baseline metrics from CT1118
sqlite3 /opt/isp-monitor/data/isp_evidence.db \
  "SELECT AVG(download_mbps), AVG(upload_mbps), AVG(ping_ms) FROM speedtests WHERE timestamp >= datetime('now', '-24 hours');"

Installation Steps¶

Step 1: Physical Connection (15 min downtime)¶

BEFORE:  ONT → [eth4] UCG
AFTER:   ONT → [WAN] Technicolor [LAN1] → [eth4] UCG

Step 2: Configure Technicolor¶

Connect laptop to Technicolor LAN port
Browser to: http://192.168.1.1
Navigate: Control Pages → Gateway Settings → Routed Type
Change to: Bridge
Save & reboot

Step 3: Verify UCG Connection¶

ssh root@REDACTED_IP
# Check WAN1 status in UniFi UI
# Should show: Connected, PPPoE active, IP: 91.151.254.171

Step 4: Validate¶

# From hub2
ssh hub2
ping REDACTED_IP          # UK UCG via WireGuard
ping REDACTED_IP         # px1
sudo wg show            # Check WireGuard status
curl https://docs.charliehub.net  # Public service

# Check latency increase
ssh root@REDACTED_IP
ping -c 4 8.8.8.8      # Should be 3-4ms (normal: 2ms)

Step 5: Monitor Performance¶

# Watch CT1118 speedtest results
ssh root@REDACTED_IP8
tail -f /opt/isp-monitor/logs/monitor.log | grep -i "speedtest\|download\|upload"

# After 24 hours, compare metrics
sqlite3 /opt/isp-monitor/data/isp_evidence.db \
  "SELECT AVG(download_mbps), AVG(upload_mbps), AVG(ping_ms) FROM speedtests WHERE timestamp >= datetime('now', '-24 hours');"

Troubleshooting¶

"Cannot reach Technicolor at 192.168.1.1"¶

Ensure you're connected to Technicolor LAN port
Power cycle Technicolor
Default credentials: check label or ISP documentation
ISP may have set custom IP - contact them

"PPPoE fails after bridge mode"¶

Verify Technicolor is actually in bridge mode (check admin panel)
Restart UCG WAN interface
Check if ISP uses VLAN tagging (needs UCG VLAN config)
Contact ISP to verify bridge mode was properly enabled

"Latency increased >10ms"¶

Technicolor may not be in true bridge mode
Verify: NAT disabled, DHCP disabled, bridge enabled
If problem persists, revert and contact ISP for alternative

"Services slower than expected"¶

Allow 24-48 hours for traffic pattern stabilization
CT1118 will show improved metrics once ISP completes diagnostics
Increased latency is expected & acceptable (1-5ms)

Rollback (Emergency)¶

# If anything goes wrong:

# Step 1: Unplug Technicolor
# Physical: ONT → [disconnect] → [reconnect] → [eth4] UCG

# Step 2: Verify UCG recovers
ssh root@REDACTED_IP
# WAN1 should reconnect within 30 seconds

# Step 3: Confirm connectivity
ping 8.8.8.8  # Should return to 2ms latency

# Done - no config changes needed

What to Expect¶

Metric	Before	During	Note
Latency	2ms	3-4ms	✅ Normal
Throughput	900 Mbps	895 Mbps	✅ Normal
Packet loss	<0.1%	<0.1%	✅ Normal
Services	Fast	Fast	✅ No impact

Key Resources¶

Full Plan: /opt/charliehub/docs-mkdocs/docs/guides/isp-testing-technicolor-bridge.md
ISP Monitor Data: ssh root@REDACTED_IP8 → /opt/isp-monitor/data/isp_evidence.db
Technicolor Manual: Contact ISP or check DGA4135 datasheet
UniFi Support: ssh root@REDACTED_IP → UniFi Network UI

Contact & Escalation¶

If Technicolor bridge mode doesn't work: 1. Verify with ISP that bridge mode is enabled 2. Check Technicolor logs at 192.168.1.1 3. Have ISP check their TR-069 configuration 4. As last resort: use ISP's router in router mode (requires firewall replication)

Document everything: Screenshot settings before/after, note timestamps of any issues, save CT1118 metrics comparison.