Barracuda Networks 4 Guide d'installation télécharger pdf (Page 33)

Setup 33

• Forward (port redirection) incoming SMTP traffic on port 25 to the Barracuda Spam Firewall at

10.10.10.3.

• Configure the Barracuda Spam Firewall to forward filtered messages to the destination mail

server at 10.10.10.2.

There is no need to modify any MX records for this type of setup.

Barracuda Spam Firewall in the DMZ

The figure below shows the Barracuda Spam Firewall in front of your corporate firewall in the DMZ.

In this example, the Mail Server has an IP address of 10.10.10.2 and the Barracuda Spam Firewall has

a public IP address of 64.5.5.5.

In this type of setup, perform the following tasks:

• Assign an available external IP address to the Barracuda Spam Firewall.

• Change the MX (Mail Exchange) records on the DNS (Domain Name Server) to direct traffic

towards the Barracuda Spam Firewall. Create an A record and MX record on your DNS for the

Barracuda.

The following example shows a DNS entry for a Barracuda Spam Firewall with a name of

barracuda and an IP address of 64.5.5.5.

barracuda.yourdomain.com IN A 64.5.5.5

The following example shows the associated MX record with a priority number of 10:

IN MX 10barracuda.yournetwork.com

Configuring your System for Outbound Mode

Your Barracuda Spam Firewall can operate in one of the following two modes:

• Inbound Mode (default) scans all incoming messages for viruses and spam probability.

• Outbound Mode scans all outgoing messages (from your users) for viruses and spam probability.

This mode ensures all e-mail leaving your network is virus-free and legitimate.

Figure 3.2:

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 141 142

Pas de commentaire

Barracuda Networks 4 Guide d'installation Page 33