Add 5G modem routing table diagnostic and repair script

[Copilot]

Raspberry Pi 5 loses internet connectivity via a 5G USB modem despite the modem being up and receiving signal — root cause is a misconfigured kernel routing table (missing/wrong default route, metric conflicts, missing subnet routes).

New: raspap/fix_5g_routing.py

Standalone Python 3 script (stdlib only) that diagnoses and optionally repairs routing issues.

Diagnostic checks:

• Modem interface detection (wwan*, usb*, ppp*, enx* CDC-Ethernet) — UP state + IP presence
• Default route existence and whether it targets the modem interface
• Default route metric vs. competing interfaces (lower metric wins)
• Modem subnet route presence (using actual prefix length from ip addr show)
• Per-interface ping to 8.8.8.8 and locale-independent DNS check via socket.getaddrinfo

Auto-fix (--fix) capabilities:

• Bring up a DOWN interface
• Request DHCP if no IP assigned (dhclient)
• Add missing default route — gateway resolved from DHCP lease files or existing routes, not guessed
• Add/re-metric modem default route to beat competing routes
• Add missing subnet route
• Append fallback nameserver to /etc/resolv.conf

python3 fix_5g_routing.py            # diagnose only
sudo python3 fix_5g_routing.py --dry-run   # preview fixes
sudo python3 fix_5g_routing.py --fix       # apply fixes

Exits 0 (clean), 1 (usage error), or 2 (issues found).

New: raspap/README.md

Documents interface patterns, check/fix matrix, usage, and exit codes.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• 8.8.8.8
  • Triggering command: REDACTED, pid is -1 (packet block)
• google.com
  • Triggering command: /usr/bin/nslookup nslookup google.com (dns block)
  • Triggering command: /usr/bin/python3 python3 raspap/fix_5g_routing.py --verbose (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

Start implementation

[Chronological Review: The conversation began with the user requesting the creation of a Python program for a Raspberry Pi 5 OS to diagnose internet connection issues via a 5G modem. The user clarified that the modem was powered and receiving a signal, indicating that the problem was related to the routing table on the Pi. The user then requested to simplify the task and confirmed that development was being done on a Windows 11 machine due to the Pi's lack of internet access. Finally, the user instructed to start the implementation of the solution.]

[Intent Mapping:

1. "In the raspap directory, create a python program or script for a raspberry pi5 OS that can determine why the internet connection via the 5G connection isn't working." - Initial request for a diagnostic script.
2. "simplify. Currently the 5G modem is powered and receiving signal. It's just a routing table problem." - Request to simplify the task based on the diagnosis.
3. "Start implementation" - Direct instruction to begin coding the solution.]

[Technical Inventory:

• Technology: Python for scripting on Raspberry Pi OS.
• Environment: Development on Windows 11, targeting Raspberry Pi 5 OS.
• Context: The script is intended to diagnose routing table issues affecting the 5G internet connection.]

[Code Archaeology: No specific files or code changes have been discussed or modified yet, as the conversation is still in the planning and initial implementation phase.]

[Progress Assessment:

• Completed Tasks: User has clarified the problem and simplified the request.
• Partially Complete Work: The implementation has not yet begun, but the user has instructed to start.]

[Context Validation: All necessary context for continuing the work is captured, including the user's environment and the specific problem to address.]

[Recent Commands Analysis:

• Last Agent Commands: The user issued commands to create a Python script and to start implementation.
• Tool Results Summary: No tool results were generated as the conversation focused on planning and initiating the implementation.
• Pre-Summary State: The agent was preparing to start the implementation of the Python script for diagnosing the routing table issue on the Raspberry Pi.
• Operation Context: The commands were executed to align with the user's goal of resolving the internet connection issue on the Raspberry Pi.]

1. Conversation Overview: - Primary Objectives: - "In the raspap directory, create a python program or script for a raspberry pi5 OS that can determine why the internet connection via the 5G connection isn't working." - "simplify. Currently the 5G modem is powered and receiving signal. It's just a routing table problem." - "Start implementation." - Session Context: The user is developing a diagnostic script for a Raspberry Pi 5 to address routing table issues affecting a 5G internet connection, with development occurring on a Windows 11 machine. - User Intent Evolution: The user initially requested a diagnostic script, then simplified the request to focus on routing table issues, and finally instructed to begin implementation.

2. Technical Foundation:

• Python: The scripting language chosen for the diagnostic program.
• Raspberry Pi OS: The target operating system for the script.
• Windows 11: The development environment being used due to the Raspberry Pi's lack of internet access.

3. Codebase Status:

• No specific files or code changes have been discussed yet, as the conversation is still in the planning phase.

4. Problem Resolution:

• Issues Encountered: The main issue is a routing table problem affecting the 5G internet connection on the Raspberry Pi.
• Solutions Implemented: None yet, as the implementation phase has just been initiated.
• Debugging Context: The user has identified the nature of the problem, which is a routing table issue.

5. Progress Tracking:

• Completed Tasks: User has clarified the problem and simplified the request.
• Partially Complete Work: Implementation of the Python script has not yet begun.

6. Active Work State:

• Current Focus: The user is preparing to implement a Python script to diagnose routing table issues on the Raspberry Pi.
• Recent Context: The user has confirmed the modem is powered and receiving a signal, indicating the problem lies within the routing table.
• Immediate Context: The user has instructed to start the implementation of the solution.

7. Recent Operations:

• Last Agent Commands: User requested to create a Python script and to start implementation.
• Tool Results Summary: No tool results were generated as the conversation focused on planning and initiating the implementation.
• Pre-Summary State: The agent was preparing to start the implementation of the Python script.
• Operation Context: The commands were executed to align with the user's goal of resolving the internet connection issue on the Raspberry Pi.

8. Continuation Plan:

• Pending Task 1: Implement...

Created from VS Code.

[tblank1024]

@copilot I don't understand what delegate to cloud means. I just want a diagnostic program in the same directory as this readme file

[Copilot]

@copilot I don't understand what delegate to cloud means. I just want a diagnostic program in the same directory as this readme file

"Delegate to cloud" is a GitHub Copilot UI button — it's not part of anything in this repository.

The diagnostic script is already in place. The raspap/ directory now contains:

raspap/
  fix_5g_routing.py   ← the diagnostic/repair script
  README.md           ← usage instructions

To run it on your Pi:

# diagnose only (no root needed)
python3 raspap/fix_5g_routing.py

# preview fixes
sudo python3 raspap/fix_5g_routing.py --dry-run

# apply fixes
sudo python3 raspap/fix_5g_routing.py --fix

[tblank1024]

@copilot what do I do now. I hit checkout

[Copilot]

@copilot what do I do now. I hit checkout

After checking out, you need to get the file onto your Raspberry Pi and run it. Here's the simplest way:

Option 1 – copy just the script directly to your Pi:

# On your Pi, download the script from GitHub
curl -O https://raw.githubusercontent.com/tblank1024/rvglue/HEAD/raspap/fix_5g_routing.py
python3 fix_5g_routing.py

Option 2 – clone the whole repo on your Pi:

git clone https://github.com/tblank1024/rvglue.git
cd rvglue/raspap
python3 fix_5g_routing.py

Option 3 – merge the PR first, then pull on your Pi:

1. On GitHub, click "Merge pull request" to merge this branch into main.
2. On your Pi: git pull (if you already cloned the repo), then cd raspap && python3 fix_5g_routing.py.

Run without sudo first to see the diagnostics. If it reports issues, re-run with sudo python3 fix_5g_routing.py --fix to apply repairs.

[tblank1024]

ok