How to protect ARP spoofing & DNS Spoofing in a Mikrotik Network.

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 MikroTik Network Security: How to Prevent ARP Spoofing and DNS Attacks

 Understanding ARP Spoofing and DNS Spoofing

      ·        ARP Spoofing: Attackers send fake ARP messages on the network to associate their MAC address             with an IP address (e.g., your gateway). This allows them to intercept, modify, or block network traffic (man-in-the-middle attacks).

·         DNS Spoofing: Attackers alter DNS queries to redirect users to malicious websites by sending false DNS responses or poisoning the DNS cache.

 Here we divide the topic for best understanding and point out those Attacks prevention techniques step by step

I have made a description youtube video for this if you like can watch this too. Click link

 1. Steps to Protect Against ARP Spoofing

     Enable ARP Filtering and Use Static ARP

        By default, ARP entries are dynamic and can be manipulated. Configuring static ARP entries can                mitigate this risk. Example Configuration: Static ARP Entries

         /ip arp

            add address=192.168.1.1 mac-address=AA:BB:CC:DD:EE:FF interface=bridge1

            add address=192.168.1.2 mac-address=AA:BB:CC:DD:EE:01 interface=bridge1

     Replace 192.168.1.x with device IPs and AA:BB:CC... with their MAC addresses.

     Enable ARP Reply-Only Mode

         The router will only respond to devices with static ARP entries.

        /interface ethernet set ether1 arp=reply-only

    2. Steps to Protect Against DNS Spoofing.

         Use MikroTik DNS Cache and Forwarder

        Secure your DNS by configuring the MikroTik router as the primary DNS server and forwarding                 requests to a trusted DNS server.

         Example Configuration: DNS Settings

     /ip dns

            set servers=8.8.8.8,1.1.1.1 allow-remote-requests=yes

Replace 8.8.8.8 and 1.1.1.1 with trusted public DNS servers (Google and Cloudflare in this case).

    Enable DNS Filtering

    Block malicious DNS responses by enabling DNS filtering through firewall rules.

    Example Configuration: Block Fake DNS Responses

         /ip firewall filter

            add chain=forward protocol=udp dst-port=53 action=drop comment="Block fake DNS requests"

            add chain=forward protocol=tcp dst-port=53 action=drop comment="Block fake DNS requests"

 3. General Security Enhancements

     Enable DHCP Snooping

     Prevent attackers from assigning themselves a rogue IP.

        /interface bridge settings set use-ip-firewall=yes

     Use VLANs for Isolation

    Separate sensitive devices into VLANs to reduce attack surface.

    Example Configuration: VLAN Setup

         /interface vlan

            add name=vlan10 vlan-id=10 interface=ether1

            /ip address add address=192.168.10.1/24 interface=vlan10

     Monitor ARP Table

        Regularly inspect the ARP table to detect anomalies.

        /ip arp print

   Use Bridge Filters

        Block ARP packets from unknown devices.

            /interface bridge filter

                add chain=forward src-mac-address=!AA:BB:CC:DD:EE:FF action=drop

 4. Test Your Configuration

     Verify ARP Filtering:

     Run a tool like arpspoof on a test machine to ensure the router denies spoofed ARP requests.

     Check DNS Integrity:

        Use tools like dig or nslookup to confirm DNS responses match your expectations.

 5. Ongoing Monitoring and Maintenance

         Monitor Logs: Enable logging to detect unusual activity.

        /system logging add topics=firewall action=memory

        Update RouterOS: Keep your MikroTik firmware updated to patch vulnerabilities.

        /system package update install

By implementing these steps, you can significantly enhance your MikroTik network's resilience against ARP and DNS spoofing attacks. If you have any question please let me know.

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