routeros script examples
Pierre Goyette
RouterOS Script Examples – Unlocking the Power of Automated Network Management
In today’s fast-paced digital landscape, network administrators and IT professionals seek efficient ways to manage and optimize their network infrastructure. MikroTik's RouterOS, renowned for its versatility and robustness, offers a powerful scripting language that enables automation, customization, and enhanced control over network devices. Whether you want to automate routine tasks, improve security, or monitor network performance, understanding RouterOS script examples can significantly streamline your workflow.
This article provides a comprehensive guide to RouterOS scripting, featuring practical examples and best practices. From basic scripts to advanced automation techniques, you'll learn how to harness the full potential of RouterOS scripting to create a more resilient, efficient, and manageable network.
Understanding RouterOS Scripting
RouterOS scripting language is a command-based language that allows administrators to automate tasks, configure devices, and respond to network events. Scripts can be executed manually, scheduled to run at specific times, or triggered by network events such as interface status changes.
Key features of RouterOS scripting include:
- Variable management
- Conditional statements (if-else)
- Loops (for, while)
- Event handling
- Integration with system functions (logging, sending emails, etc.)
Before diving into examples, ensure you have access to the MikroTik terminal or Winbox interface, and understand basic RouterOS commands.
Basic RouterOS Script Examples
1. Simple Backup Script
A fundamental task for network management is backing up configuration files regularly. Here's a simple script:
```plaintext
/system backup save name=backup-$(/system clock get time)
```
This script saves a backup named with the current time, aiding in version control.
2. Restarting a Interface Based on Traffic
Automate interface management with traffic monitoring:
```plaintext
:if ([/interface monitor-traffic ether1 once as-value]->"rx-rate") > 1000000 do={
/interface disable ether1
/delay 10s
/interface enable ether1
}
```
This script disables 'ether1' if traffic exceeds 1 Mbps, then re-enables it after 10 seconds.
3. Sending Email Alerts on High CPU Usage
Monitoring CPU load and alerting admins:
```plaintext
:local cpuUsage [/system resource get cpu-load]
:if ($cpuUsage > 80) do={
/tool e-mail send to="[email protected]" subject="High CPU Usage" body=("CPU load is at " . $cpuUsage . "%")
}
```
Ensure email settings are configured beforehand.
Advanced RouterOS Script Examples
4. Dynamic Firewall Rules Based on IP Address
Automatically block an IP address after multiple failed login attempts:
```plaintext
:local ip "192.168.1.50"
:local maxAttempts 3
:local attempts [/tool user-manager active-user find where=common-ip=$ip]
:if ($attempts > $maxAttempts) do={
/ip firewall filter add chain=input src-address=$ip action=drop comment="Blocked after failed attempts"
}
```
This script can be integrated with login failure logs.
5. Automated VPN Connection Management
Ensure VPN connection remains active:
```plaintext
:if ([/interface l2tp-server get [find name="L2TP-VPN"] running]) = false do={
/interface l2tp-client connect name=L2TP-VPN user=youruser password=yourpass
}
```
Schedule this script periodically to maintain VPN connectivity.
6. Network Monitoring and Logging
Track bandwidth usage and log:
```plaintext
:local totalRx [/interface monitor-traffic ether1 once as-value]->"rx-byte"]
:local totalTx [/interface monitor-traffic ether1 once as-value]->"tx-byte"]
/log info message=("Ether1 Traffic - RX: " . $totalRx . " bytes, TX: " . $totalTx . " bytes")
```
Set up scripts to run at intervals for continuous monitoring.
Best Practices for Writing RouterOS Scripts
- Comment Your Scripts: Use comments (``) extensively to explain logic, making maintenance easier.
- Test Scripts in a Lab Environment: Before deploying on production, test scripts to avoid unintended disruptions.
- Use Variables Wisely: Store values in variables for readability and reusability.
- Schedule Scripts Carefully: Use `/system scheduler` to automate tasks during off-peak hours.
- Handle Errors Gracefully: Incorporate error checking to prevent scripts from failing silently.
Scheduling and Automating Scripts
RouterOS provides a scheduler to run scripts automatically:
```plaintext
/system scheduler add name="Daily Backup" start-date=jan/01/2024 start-time=02:00:00 interval=24h on-event="/system backup save name=backup-$(/system clock get time)"
```
This schedules daily backups at 2 AM.
Conclusion
RouterOS scripting opens up a world of automation, enabling network administrators to reduce manual effort, improve security, and optimize performance. By mastering script examples—from basic backups to complex event-driven actions—you can tailor your MikroTik devices to meet your specific needs.
Remember, the key to effective scripting is continuous learning and experimentation. With the myriad of possibilities available, well-crafted scripts can significantly enhance your network’s resilience and efficiency.
Harness the full potential of RouterOS scripting today and transform your network management approach into a seamless, automated process.
RouterOS Script Examples: Unlocking the Power of MikroTik's Scripting Capabilities
RouterOS, MikroTik’s proprietary operating system, is renowned for its flexibility and robustness in managing network infrastructure. One of its standout features is the scripting language, which allows network administrators to automate tasks, customize configurations, and enhance network performance without manual intervention. In this comprehensive guide, we'll explore a variety of RouterOS script examples, diving deep into their applications, syntax, and best practices to help you leverage the full potential of RouterOS scripting.
Understanding RouterOS Scripting Fundamentals
Before diving into specific examples, it’s crucial to grasp the basics of RouterOS scripting. The scripting language is a command-line language designed to manipulate RouterOS configurations and perform automation tasks.
Key Concepts:
- Scripts are stored as text files within RouterOS and can be executed manually or scheduled.
- Variables are declared with the `:local` command.
- Control structures include `if`, `for`, `while`, and `switch`.
- Commands mimic CLI commands, making it intuitive for administrators familiar with RouterOS.
- Scheduling scripts allows automation of repetitive tasks.
Common Use Cases:
- Automating user account creation
- Monitoring network health
- Managing firewall rules dynamically
- Configuring VPNs
- Collecting logs and statistics
- Dynamic routing adjustments
Basic Script Examples to Get Started
Starting with simple scripts helps build confidence and understanding.
Example 1: Creating a User Account
```plaintext
:local username "guest"
:local password "password123"
Check if user exists
:if ([ /user find name=$username ] = "") do={
/user add name=$username password=$password group=read
:log info "User $username created."
} else={
:log info "User $username already exists."
}
```
Explanation:
- Declares username and password variables.
- Checks if the user exists.
- Adds the user if not present.
- Logs the action.
Example 2: Simple Ping Monitoring
```plaintext
:local target "8.8.8.8"
:local count 5
:if ([ /ping $target count=$count ] = 0) do={
:log warning "$target is unreachable."
} else={
:log info "$target is reachable."
}
```
Explanation:
- Pings Google DNS.
- Logs network reachability status.
Advanced RouterOS Scripting Applications
Once comfortable with basics, you can explore more complex scripts that automate network management tasks.
Example 3: Dynamic Firewall Rule Management
Suppose you want to block IP addresses that have exceeded a certain number of failed login attempts.
```plaintext
:local threshold 5
:local blockTime 1h
Loop through IPs with failed attempts
:foreach failedIp in=[/ip firewall address-list find list=failed-logins] do={
:local attempts [/ip firewall address-list get $failedIp value-name=attempts]
:if ($attempts >= $threshold) do={
/ip firewall address-list add list=blocked-ips address=[/ip firewall address-list get $failedIp address]
Remove from failed list
/ip firewall address-list remove $failedIp
:log warning "Blocked IP: [/ip firewall address-list get $failedIp address]"
}
}
```
Explanation:
- Maintains a list of failed login attempts.
- Blocks IPs exceeding attempts threshold.
- Demonstrates dynamic rule creation and removal.
Example 4: Automated VPN User Management
Automate the creation of VPN users based on external data or schedules.
```plaintext
:local username "vpnuser1"
:local password "securePass!"
:local profile "default"
Check if user exists
:if ([ /ppp secret find name=$username ] = "") do={
/ppp secret add name=$username password=$password profile=$profile service=mppe
:log info "VPN user $username added."
} else={
:log info "VPN user $username already exists."
}
```
Explanation:
- Adds a new PPP secret for VPN access if not already present.
- Ensures idempotency.
Automation and Scheduling with Scripts
Repetitive tasks can be automated using scheduled scripts.
Example 5: Daily Interface Traffic Report
```plaintext
/system script add name=dailyTrafficReport source={
:local interfaces [/interface find]
:foreach i in=$interfaces do={
:local name [/interface get $i name]
:local rx [/interface get $i rx-byte]
:local tx [/interface get $i tx-byte]
/log info ("Interface $name - RX: $rx bytes, TX: $tx bytes")
}
}
```
Then schedule this script:
```plaintext
/system scheduler add name=dailyTrafficReport schedule=0 0 interval=1d on-event=dailyTrafficReport
```
Explanation:
- Collects and logs traffic data daily.
- Demonstrates scheduled execution.
Complex Use Cases and Best Practices
While simple scripts are useful, complex network environments benefit from sophisticated scripting.
1. Handling Errors Gracefully
Always include error handling to prevent scripts from failing silently.
```plaintext
:local result [/ip address add address=192.168.1.1/24 interface=ether1]
:if ($result = "") do={
:log error "Failed to add IP address."
}
```
2. Using External Data Sources
Scripts can fetch data via HTTP or fetch commands, enabling integration with APIs or external databases.
```plaintext
/tool fetch url="http://api.example.com/get-config" mode=https dst-path=config.json
Parse JSON if needed (requires additional scripting or external tools)
```
3. Modular Scripting
Break scripts into functions for reusability.
```plaintext
:global addFirewallRule do={
/ip firewall filter add chain=input protocol=tcp dst-port=22 action=accept
}
```
Invoke with `addFirewallRule`.
Security Considerations When Using Scripts
- Always validate and sanitize external data sources.
- Protect scripts containing sensitive information.
- Limit script execution permissions.
- Regularly review and update scripts to patch vulnerabilities.
Conclusion: Mastering RouterOS Scripting for a Smarter Network
RouterOS scripting opens a vast realm of possibilities for network automation, management, and customization. From simple user management scripts to complex dynamic firewall rules and scheduled reports, mastering these examples empowers network administrators to create resilient, efficient, and self-managing networks.
As you experiment with scripting:
- Start small, iteratively build complexity.
- Test scripts in controlled environments before deployment.
- Leverage MikroTik's extensive documentation and community forums for support.
- Continuously explore new scripting techniques to adapt to evolving network needs.
Harnessing the power of RouterOS scripts transforms manual configurations into automated workflows, reducing errors, saving time, and providing greater control over your network infrastructure.
Remember: Proper scripting is an art that combines technical knowledge with best practices in security and automation. Keep refining your scripts, stay updated with RouterOS features, and you'll unlock new levels of network management efficiency.
Question Answer What are some common use cases for RouterOS scripting? RouterOS scripting is often used for automating tasks such as dynamic IP address management, configuring firewall rules, scheduling backups, monitoring network status, and customizing device behavior based on specific conditions. Can you provide an example of a script that logs the current CPU load? Yes. Example: ```mikrotik :local cpuLoad [/system resource get cpu-load] /log info message="Current CPU load is $cpuLoad%" ``` How do I schedule a script to run daily at a specific time in RouterOS? You can create a scheduler entry in RouterOS. For example: ```mikrotik /system scheduler add name="DailyBackup" start-date=jan/01/2024 start-time=00:00:00 interval=1d on-event="/system backup save name=daily-backup" ``` What is the best way to automate dynamic DNS updates using RouterOS scripts? You can write a script that checks your external IP address and updates your DNS provider via API calls or DNS records if it changes. Schedule this script to run periodically with the scheduler. Example: ```mikrotik :local currentIP [/ip address get [find interface="ether1"] address]; // Compare with stored IP and update DNS via API if different ``` Are there any best practices for writing efficient and safe RouterOS scripts? Yes. Best practices include commenting your scripts for clarity, testing scripts in a controlled environment before deployment, using variables to simplify maintenance, avoiding unnecessary commands within loops, and implementing error handling to prevent unintended disruptions.
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