Step-by-Step Setup Guides for Penn Remote Access

Windows 10/11: Cisco AnyConnect Installation and Configuration

Installation with Administrative Privileges
Ensure the system meets the minimum requirements (Windows 10/11, 64-bit, .NET Framework 4.7.2+). Download the latest Penn-approved AnyConnect client from the Penn IT VPN portal and run the installer as Administrator. During installation, select "Custom" to disable unnecessary modules (e.g., Secure Mobility) unless required for specific use cases. Verify the installation by checking the C:\Program Files (x86)\Cisco\Cisco AnyConnect Secure Mobility Client directory for the executable.

Network Adapter Settings for VPN Stability
Windows dynamically assigns network metrics, which can degrade VPN performance. To optimize:
1. Open Control Panel > Network and Sharing Center > Change adapter settings.
2. Right-click the AnyConnect VPN adapter (e.g., "Cisco AnyConnect Secure Mobility") and select Properties.
3. Under the Networking tab, ensure Internet Protocol Version 4 (TCP/IPv4) is enabled.
4. Click Properties and set:

Firewall and Trusted Sites Configuration
Windows Defender Firewall may block AnyConnect traffic if the VPN server is not whitelisted. To resolve this:
1. Open Windows Defender Firewall with Advanced Security (search via Start Menu).
2. Navigate to Inbound Rules and locate "Cisco AnyConnect Secure Mobility" rules. Ensure they are Enabled.
3. Right-click Inbound Rules > New Rule > Program. Browse to the AnyConnect executable (`anyconnect.exe` in the installation directory) and allow the connection.
4. Under Trusted Sites, add Penn’s VPN server (`vpnclient.it.penn.edu`) to prevent firewall prompts:

macOS Ventura/Sonoma: Cisco AnyConnect Configuration and Troubleshooting

Enabling Third-Party VPN Connections
macOS Ventura/Sonoma restricts VPN clients by default. To enable Cisco AnyConnect:
1. Open System Preferences > Network > VPN > VPN Options.
2. Check "Allow VPN connections from third-party clients" and authenticate with an admin password.
3. If prompted, approve the Cisco Systems, Inc. kernel extension in System Preferences > Security & Privacy > General. If the extension is blocked, click Allow Anyway and restart the system.

Troubleshooting Kernel Extensions (kext) Issues
If AnyConnect fails to load due to kext restrictions:
1. Open Terminal and verify the kext status:

kextstat | grep -i cisco

If no output appears, the kext is not loaded.
2. Manually load the kext (requires admin privileges):

sudo kextload /Library/Extensions/CiscoAnyConnectNKE.kext

3. For persistent issues, reset the macOS VPN settings:

sudo networksetup -removeallvpnconnections
sudo networksetup -setvpn on

4. Reinstall AnyConnect via the `.pkg` installer from Penn’s approved source.

Automatic Reconnection Scripts for Unstable Networks
Network fluctuations can disrupt VPN sessions. Use the following AppleScript to auto-reconnect on failure (save as `PennVPNReconnect.scpt`):

tell application "System Events"
tell process "Cisco AnyConnect"
if exists (UI element "Disconnected") then
click button "Reconnect" of window "Cisco AnyConnect Secure Mobility Client"
delay 3
end if
end tell
end tell

Schedule this script via Automator or LaunchAgent (e.g., `launchd`):

echo ' Label com.penn.vpn.reconnect ProgramArguments /usr/bin/osascript /path/to/PennVPNReconnect.scpt StartInterval 60 ' > ~/Library/LaunchAgents/com.penn.vpn.reconnect.plist

Load the agent:

launchctl load ~/Library/LaunchAgents/com.penn.vpn.reconnect.plist

Linux (Ubuntu/Debian): OpenConnect and Network Manager VPN Setup

Installing OpenConnect or Network Manager VPN Plugins
Ubuntu/Debian users can install OpenConnect via:

sudo apt update
sudo apt install openconnect network-manager-openconnect network-manager-openconnect-gnome

For Network Manager integration (GUI):

sudo apt install network-manager-openvpn

Verify installation:

openconnect --version

If using Debian, enable the `contrib` repository:

sudo sed -i 's/main/main contrib/g' /etc/apt/sources.list
sudo apt update

Configuring `/etc/network/interfaces` for Persistent Connections
For systems using `ifupdown` (e.g., Ubuntu Server), add a persistent VPN entry:

sudo nano /etc/network/interfaces

Append the following (replace `username` and `password` with PennKey credentials or a credential helper):

auto vpn-penn
iface vpn-penn inet vpn
pre-up ip route add default via dev provider vpn-penn
auto vpn-penn
iface vpn-penn inet vpn
provider vpn-penn
pre-up openconnect --background --script=/etc/openconnect/vpn-penn-script.sh vpnclient.it.penn.edu
up ip route add default via dev down ip route del default via dev

Create a script (`/etc/openconnect/vpn-penn-script.sh`) to handle authentication:

#!/bin/bash
echo "POST /rweb-vpn/login.html HTTP/1.0" > /tmp/oc-script
echo "Content-Type: application/x-www-form-urlencoded" >> /tmp/oc-script
echo "" >> /tmp/oc-script
echo "username=&password=&domain=PENN&btnSubmit=Connect" >> /tmp/oc-script

Managing Traffic Routing with `iptables` for Split Tunneling
By default, VPN traffic routes all internet traffic through the tunnel. To enable split tunneling (route only Penn traffic via VPN):

# Flush existing rules
sudo iptables -F
sudo iptables -t nat -F

# Add rules to route Penn subnets via VPN
sudo iptables -A OUTPUT -d 128.91.0.0/16 -j ACCEPT
sudo iptables -t nat -A POSTROUTING -o tun0 -j MASQUERADE

# Route all other traffic via primary interface
sudo iptables -A OUTPUT -m owner ! --

Advanced Configuration and Customization for Penn Remote Access

Network Protocol Optimizations

MTU Adjustment in Cisco AnyConnect
Packet fragmentation occurs when the Maximum Transmission Unit (MTU) exceeds the network’s capacity. For Penn’s VPN, reducing the MTU to 1300–1400 bytes (default: 1500) often resolves fragmentation errors without significant throughput loss.

Command for manual MTU adjustment (Linux/macOS):
`sudo ifconfig tun0 mtu 1350`
For Cisco AnyConnect (GUI):
1. Navigate to Preferences > Advanced.
2. Under Network, set MTU to 1350.
3. Enable "Fragmentation Handling" if available.

Windows (PowerShell as Admin):
`Disable-NetAdapterBinding -Name "AnyConnect" -ComponentID ms_tcpip6`
Linux (via `sysctl`):
`echo "net.ipv6.conf.all.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf`
macOS (via Network Preferences):
1. Go to System Preferences > Network > Advanced.
2. Select the VPN interface > TCP/IP > Configure IPv6 > Off.

Automation Scripts for Penn Remote Access Tasks

while ! ping -c 1 penn-vpn.upenn.edu &>/dev/null; do

  sleep 5

  /opt/cisco/anyconnect/bin/vpn -s penn-vpn.upenn.edu

done

Get-RDUserSession -ConnectionBroker penn-rd.upenn.edu |

  Where-Object { $_.IdleTime -gt 30 } |

  Terminate-RDUserSession -ErrorAction SilentlyContinue

import re

import subprocess
log_path = "/var/log/anyconnect.log"

errors = ["SSL", "TIMEOUT", "DISCONNECT"]
with open(log_path, "r") as f:

    for line in f:

        if any(error in line for error in errors):

            subprocess.run(["notify-send", "VPN Alert", line])

for dir in ~/PennBox/*; do

  rsync -av --progress "$dir" "pennbox://user@pennbox.upenn.edu/$dir"

done

Integration with Third-Party Tools

Configuring Proxy Settings for Browser/Desktop Apps
Many third-party tools (e.g., Jira, Slack) require proxy settings to route traffic through Penn’s VPN. Configure as follows:

Windows (System Proxy):
1. Open Settings > Network & Internet > Proxy.
2. Set Manual proxy setup with:

Address: `128.91.128.12` (Penn’s VPN gateway)

Port: `3128` (default for Penn’s proxy)

Check "Use the same proxy for all protocols".

Browser-Specific (Chrome/Firefox):
1. Go to Settings > Advanced > System.
2. Enable "Use the same proxy as the system" or manually enter Penn’s proxy.

Command (Linux/macOS):
`ssh -L 8080:localhost:80 user@penn-vpn.upenn.edu -N`
Then access:
`http://localhost:8080` (maps to `pennwiki.upenn.edu:80`).

Block all traffic except VPN (PowerShell)
New-NetFirewallRule -DisplayName "Block Non-VPN Traffic" `

  -Direction Outbound -RemoteAddress Any `

  -Action Block -Enabled True

  

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