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2026-02-12 15:46:57 -08:00

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# ER605 NAT IP Configuration - 76.53.10.35
**Last Updated:** 2026-01-31
**Document Version:** 1.0
**Status:** Active Documentation
---
**Date**: 2026-01-09
**Question**: Do I need to configure 76.53.10.35 as a WAN IP, or just list it in the NAT rule?
**Note:** ER605 was replaced by the UDM Pro (76.53.10.34). Port forwarding: 76.53.10.36:80/443 → 192.168.11.167:80/443 (NPMplus). NPMplus LXC has .166 and .167; only .167 is used in UDM Pro.
---
## Answer: It Depends on Your Router Configuration
### Option 1: Use in NAT Rule Only (Most Common)
**If your ER605 WAN1 is configured with:**
- IP Address: `76.53.10.34`
- Subnet Mask: `255.255.255.240` (or `/28`)
**Then:** You can use `76.53.10.35` directly in the NAT rule **without** configuring it as an additional WAN IP.
**Why:** The router already knows about the entire `/28` block (76.53.10.32-47) because of the subnet mask. It can route traffic to any IP in that block.
---
### Option 2: Configure as Additional WAN IP (If Required)
**If your router requires explicit IP configuration:**
Some routers (especially in Omada Controller) may require you to configure additional WAN IPs explicitly.
**Steps:**
1. Navigate to: **WAN****WAN Settings****WAN1**
2. Look for: **Additional IP Addresses** or **Secondary IPs**
3. Add: `76.53.10.35/28` (or just `76.53.10.35` with subnet mask)
**Then:** Use `76.53.10.35` in your NAT rule.
---
## Recommended Configuration
### Check Your Current WAN1 Settings
**Current Configuration (from docs):**
```
Interface: WAN1
IP Address: 76.53.10.34
Subnet Mask: 255.255.255.240 (/28)
Gateway: 76.53.10.33
```
**If this matches your setup:** You should be able to use `76.53.10.35` directly in the NAT rule without additional configuration.
---
## NAT Rule Configuration
### In ER605 GUI or Omada Controller
**Navigate to:** NAT → Port Forwarding → Add Rule
**Rule 1: HTTPS**
```
Rule Name: Web Services (All Domains)
Enabled: ✅ Yes
Interface: WAN1
External IP: 76.53.10.35 ← Just enter this IP here
External Port: 443
Internal IP: 192.168.11.26
Internal Port: 443
Protocol: TCP
Source IP: 0.0.0.0/0
```
**Rule 2: HTTP**
```
Rule Name: HTTP (Let's Encrypt)
Enabled: ✅ Yes
Interface: WAN1
External IP: 76.53.10.35 ← Same IP here
External Port: 80
Internal IP: 192.168.11.26
Internal Port: 80
Protocol: TCP
Source IP: 0.0.0.0/0
```
---
## Testing
### Test if IP is Accessible
1. **From Internet:**
```bash
curl -I http://76.53.10.35
# Should reach your Nginx (if NAT is working)
```
2. **Check Router Logs:**
- Navigate to: **System Tools** → **System Log**
- Look for NAT/port forwarding entries
- Check for any errors related to 76.53.10.35
3. **Test DNS Resolution:**
```bash
dig sankofa.nexus +short
# Should return: 76.53.10.35
```
---
## Troubleshooting
### If NAT Rule Doesn't Work
**Try Option 2 (Configure as Additional WAN IP):**
1. **In Omada Controller:**
- Navigate to: **Settings** → **WAN** → **WAN1**
- Look for: **Additional IP Addresses** or **Secondary IPs**
- Add: `76.53.10.35`
2. **In ER605 Direct GUI:**
- Navigate to: **Network** → **WAN** → **WAN1**
- Look for: **Additional IP Addresses**
- Add: `76.53.10.35` with subnet mask `255.255.255.240`
3. **Save and Apply Configuration**
4. **Retry NAT Rule**
---
## Summary
**Most Likely:** You can use `76.53.10.35` directly in the NAT rule without configuring it as an additional WAN IP, because:
- Your WAN1 is configured with `/28` subnet mask
- The router knows about the entire IP block
- NAT rules can reference any IP in the block
**If It Doesn't Work:** Configure `76.53.10.35` as an additional/secondary WAN IP, then use it in the NAT rule.
---
## Public IP Block #1 Reference
| IP Address | Purpose | Status |
|------------|---------|--------|
| 76.53.10.33 | Gateway | ✅ Reserved |
| 76.53.10.34 | UDM Pro (edge; replaced ER605) | ✅ Active |
| **76.53.10.35** | **NAT for Nginx** | ✅ **In Use** |
| 76.53.10.36-46 | Available | Available |
| 76.53.10.47 | Broadcast | Reserved |
---
**Recommendation:** Try using `76.53.10.35` directly in the NAT rule first. If it doesn't work, then configure it as an additional WAN IP.