Configure Spamhaus (E)DROP

The Spamhaus Don’t Route Or Peer Lists

DROP (Don’t Route Or Peer) and EDROP are advisory “drop all traffic” lists, consisting of netblocks that are “hijacked” or leased by professional spam or cyber-crime operations (used for dissemination of malware, trojan downloaders, botnet controllers). The DROP and EDROP lists are a tiny subset of the SBL, designed for use by firewalls and routing equipment to filter out the malicious traffic from these netblocks.

Source : https://www.spamhaus.org/drop/

For this how to we will use the Alias feature and a firewall block rule. The lists for this example are located here:

• DROP list

• EDROP list

Step 1 - Create an Alias for Spamhaus

Go to Firewall ‣ Aliases ‣ All and press the Add a new alias button in the top right corner of the form.

Enter the following data:

Name	spamhaus_drop	Name of our alias
Description	Spamhaus DROP	Freely chosen description
Type	URL Table (IPs)	URL type
Host(s)	https://www.spamhaus.org/drop/drop.txt	Don’t Route Or Peer List

Set the update frequency to 1 for each day.

Press Save and then Add a new alias.

Name	spamhaus_edrop	Name of our alias
Description	Spamhaus EDROP	Freely chosen description
Type	URL Table (IPs)	URL type
Host(s)	https://www.spamhaus.org/drop/edrop.txt	Extended Don’t Route Or Peer List

Set the update frequency to 1 for each day. Press Save and then Apply changes.

Step 2 - Firewall Rules Inbound Traffic

We will block incoming connections and outgoing connections for the drop and edrop lists. To do so we will start with inbound traffic on the WAN interface. Go to Firewall ‣ Rules Select the WAN tab and press the + icon in the lower right corner.

Enter the following configuration and leave all other parameters on default values:

Action	Block	Choose block to drop the incoming traffic
Interface	WAN	Should be the default value
TCP/IP Version	IPv4	For our example we use IPv4
Source	spamhaus_drop	Our alias for the DROP list
Category	Spamhaus	Freely chosen Category
Description	Block DROP	Freely chosen description

Save and repeat this action for the EDROP list:

Action	Block	Choose block to drop the incoming traffic
Interface	WAN	Should be the default value
TCP/IP Version	IPv4	For our example we use IPv4
Source	spamhaus_edrop	Our alias for the DROP list
Category	Spamhaus	Freely chosen Category
Description	Block EDROP	Freely chosen description

Save

Step 3 - Firewall Rules Outbound Traffic

Now do the same for outbound traffic traffic on the LAN interface. Go to Firewall ‣ Rules Select the LAN tab and press the + icon in the lower right corner.

Action	Block	Choose block to drop the incoming traffic
Interface	LAN	Should be the default value
TCP/IP Version	IPv4	For our example we use IPv4
Destination	spamhaus_drop	Our alias for the DROP list
Category	Spamhaus	Freely chosen Category
Description	Block DROP	Freely chosen description

Save and add the EDROP list:

Action	Block	Choose block to drop the incoming traffic
Interface	LAN	Should be the default value
TCP/IP Version	IPv4	For our example we use IPv4
Destination	spamhaus_edrop	Our alias for the DROP list
Category	Spamhaus	Freely chosen Category
Description	Block EDROP	Freely chosen description

Save and Apply changes

DONE

Check pf Tables

To list the IP addresses that are currently in the DROP and EDROP lists go to Firewall ‣ Diagnostics ‣ pfTables and select the list you want to see: