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We are currently running an actiontech DSL modem for internet access. &nbsp;This has a public IP address. &nbsp;The modem is directly attached to our MS Server 2003, which acts as a Firewall and NAT with DHCP and DNS. &nbsp;It is also our domain controller and it 'serves' the internet for workstations. &nbsp;The DSL modem also has a basic firewall on it.<br />
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My boss wants to know how 'secure' we are with that set-up. &nbsp;Also if their are any good, cost-effective pieces of intrusion detection software for server 2003.
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We are currently running an actiontech DSL modem for internet access.  This has a public IP address.  The modem is directly attached to our MS Server 2003, which acts as a Firewall and NAT with DHCP and DNS.  It is also our domain controller and it 'serves' the internet for workstations.  The DSL modem also has a basic firewall on it.

My boss wants to know how 'secure' we are with that set-up.  Also if their are any good, cost-effective pieces of intrusion detection software for server 2003.

SECURITY RECOMMENDATIONS FOR SERVER 2003

Windows Server 2003 was based on Windows XP and was released in four editions: Web, Standard, Enterprise and Datacenter. It also had derivative versions for clusters, storage and Microsoft’s Small Business Server. Important upgrades included integrating Internet Information Services (IIS), improvements to Active Directory (AD) and Group Policy (GP), and the migration to Automated System Recovery (ASR).