D-Link DSL-504G manual Firewall, Attacks Port Scans

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DSL-504G ADSL Router User’s Guide

Firewall

The Firewall Configuration menu allows the Router to enforce specific predefined policies intended to protect against certain common types of attacks. There are two general types of protection that can be enabled on the Router, as well as filtering for specific packet types sometimes used by hackers.

Figure 4- 5. Firewall Configuration Menu

Under Protection Policy you can choose to Enable or Disable protection against a basket of attack and scan types included as Attack Protection. When Attack Protection is enabled, it will create a firewall policy to protect your network against the following attack types and port scans:

Attacks

Port Scans

 

Ping of Death Attack

Fragmentation Scan

Null Scan

Tear Drop Attack

UDP Scan

RST Scan

IP Spoofing Attack

ICMP Scan

SYNACK Scan

Smurf Attack

TCP Session Scan

FIN Scan

Land Attack

Xmas Scan

ACK Scan

You can also choose to Enable or Disable protection against various denial-of-service type attacks with the DOS Protection option.

A "denial-of-service" attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service. Examples include: attempts to "flood" a network, thereby preventing legitimate network traffic, attempts to disrupt connections between two machines, thereby preventing access to a service, attempts to prevent a particular individual from accessing a service, or, attempts to disrupt service to a specific system or person.

The Service Filtering options allow you to block FTP, Telnet or response to Pings from the external network. Check the category you want to block to enable filtering of that type of packet.

When you have selected the desired Firewall policies, click the Apply button to enforce the policies. Remember to save any configuration changes.

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Contents DSL-504G Adsl Router CE Mark Warning Limited Warranty What You Must Do For Warranty Service DSL-504G Adsl Router User’s Guide Contents RIP Page About This User’s Guide Installation RequirementsBefore You Start Record Your Account Information Ethernet Port NIC AdapterInformation you will need about your LAN or computer Router Description and Operation What is ADSL?Router Features Front Panel Display PowerStatus Adsl Link/ActRear Panel Connections Factory Reset Button Power on RouterConnect Adsl Line Network ConnectionsConnect Router to Ethernet Computer to Router ConnectionHub or Switch to Router Connection Wan Configuration Summary Configuring IP Settings on Your ComputerConfigure Windows XP for Dhcp DSL-504G Adsl Router User’s Guide DSL-504G Adsl Router User’s Guide Windows Configure Windows 2000 for DhcpWindows NT 4.0 workstations Windows 95, 98, MEDSL-504G Adsl Router User’s Guide Check for Proxy service in Windows Internet Explorer Access the Web ManagerUsing the Web Manager Using the Setup Wizard DSL-504G Adsl Router User’s Guide Dynamic IP Address Connections PPPoE/PPPoA ConnectionsBridge Connections Static IP Address ConnectionsDSL-504G Adsl Router User’s Guide WAN Settings Menu PPPoE / PPPoA Configure WAN ConnectionPPPoE and PPPoA Connection for WAN Bridged Connection for WAN WAN Settings Menu Bridge ModeDynamic IP Address for WAN Connection WAN Settings Dynamic IP AddressStatic IP Address for WAN Connection WAN Settings Static IPConfigure LAN IP settings LAN IP SettingsConfigure Dhcp server settings for the LAN Dhcp Server Settings for the LANUse the Router for Dhcp Disable the Dhcp ServerUse the ISP’s Dhcp Server Dhcp Server RelayConfigure DNS IP address DNS Server SettingsSave Settings and Restart the Router Save New SettingsDirectory Configuration and Read-only Menus Advanced configuration menusNAT Virtual Server NAT Configuration Protocol Type Private IP Private Port Public PortFilters Filters Configuration MenuDestination IP Source IPSource Port Destination PortAttacks Port Scans FirewallStatic Routing menu Static RoutingReceive Mode Send ModeIf Name PPP Settings Adsl Modulation SettingsATM VC Multiple Virtual Connections Configure Multiple PVCs12. Configure new VC Tools and Utilities Change System Password15. Time Settings Menu Configure System TimePing Test Save Router Configuration SettingsLoad Saved Configuration Files Save Configuration File to PCRestore Factory Default Settings 18. Firmware Upgrade Firmware UpgradeDevice Information Display Router Status InformationLog Adsl Status22. Traffic Statistics Traffic StatisticsData Transfer Standards & ProtocolsRate Media InterfaceCE Class B, FCC Class B Part Physical and EnvironmentalIn-Line Filters In-line Filter InstallationSplit Line Filter DSL-504G Split Line Filter InstallationPage Offices Print, type or use block letters Registration Card