1. Home
    2. /
  2. Manuals
    3. /
  3. Cisco
    4. /
  4. DPC3825
    5. /
  5. 11
Page 51 / 104 Scroll up to view Page 46 - 50
4021196 Rev B
51
Configure Security
Configure Security
Security > Firewall
Advanced firewall technology deters hackers and protects the home network from
unauthorized access. Use this page to configure a firewall that can filter out various
types of unwanted traffic on the gateway’s local network.
Select the
Firewall
tab to open the Security Firewall page.
Use the descriptions and instructions in the following table to configure the firewall
for your residential gateway. After you make your selections, click
Save Settings
to
apply your changes or
Cancel Changes
to cancel.
Section
Field Description
Firewall
SPI Firewall Protection
SPI Firewall Protection blocks Denial of Service (DoS) attacks. A DoS attack does not
attempt to steal data or damage your computers, but it overloads your Internet
connection so you cannot use it.
Select the desired option:
Enable
(factory default)
Disable
Page 52 / 104
52
4021196 Rev B
Configure Security
Section
Field Description
Filters
Filter Proxy
Enables/disables filter proxy. If local users have access to WAN proxy servers, they
may be able to circumvent the content filters and access Internet sites blocked by
the device. If you select the Filter Proxy feature, it will block access to any WAN
proxy servers.
Block Pop-Up Windows
Enables/disables popup windows. Some commonly used applications employ
popup windows as part of the application. If you disable popup windows, it may
interfere with some of these applications.
Block Web Page Cookies
Enables/disables cookie blocking. This feature filters the unsolicited delivery of
cookies to devices from the Internet to devices in your private local network.
Cookies are computer files that contain personal information or web surfing
behavior data.
Block Java and ActiveX Scripts
Enables/disables java applets and ActiveX scripts. This feature helps to protect the
devices in your private network from irritating or malicious Java applets that are
sent, unsolicited, to devices in your private network from the Internet. These
applets run automatically when they are received by a PC.
Java is a programming language for websites. If you select the Filter Java Applets
feature, you may not have access to Internet sites created using this programming
language.
This feature also helps to protect the devices in your private network from irritating
or malicious ActiveX controls that are sent, unsolicited, to devices in your private
network from the Internet. These ActiveX controls run automatically when they are
received by a PC.
Block fragmented IP packets
Enables/disables filtering of fragmented IP packets. This feature helps protect your
private local network from Internet based denial of service attacks.
Block Port Scan Detection
Enables/disables the gateway from responding to Internet based port scans. This
feature is designed to protect your private local network from Internet based
hackers who attempt to gain unsolicited access your network by detecting open IP
ports on your gateway.
Block IP Flood Detection
(checked – factory default)
Blocks malicious devices that are attempting to flood devices or networks with
illegal broadcast packets. Also referred to as “broadcast storm.”
Block WAN
Requests
Block Anonymous Internet Requests
(checked – factory default)
Enable this feature to keep your network from being "pinged" or detected by other
Internet users. The Block Anonymous Internet Requests feature also hides your
network ports. Both make it more difficult for outside users to enter your network.
Page 53 / 104
4021196 Rev B
53
Configure Security
Security > VPN Passthrough
Use this page to configure Virtual Private Network (VPN) support. Enabling the
settings on this page allows VPN tunnels using IPsec or PPTP protocols to pass
through the gateway's firewall. Select the
VPN Passthrough
tab to open the Security
VPN Passthrough page.
Use the descriptions and instructions in the following table to configure the VPN
passthrough for your residential gateway. After you make your selections, click
Save
Settings
to apply your changes or
Cancel Changes
to cancel.
Section
Field Description
VPN
Passthrough
IPSec Passthrough
Enables/disables Internet Protocol Security (IPsec). IPsec is a suite of
protocols used to implement secure exchange of packets at the IP layer. If
you enable IPSec Passthrough, applications that use IPsec (IP Security) can
pass through the firewall. To disable IPSec Passthrough select
Disable
.
Select the desired option:
Enable
(factory default)
Disable
PPTP Passthrough
Enables/disables Point-to-Point Tunneling Protocol (PPTP). PPTP allows the
Point-to-Point Protocol (PPP) to be tunneled through an IP network. If you
enable PPTP passthrough, applications that use Point to Point Tunneling
Protocol (PPTP) can pass through the firewall To disable PPTP Passthrough
select
Disable
.
Select the desired option:
Enable
(factory default)
Disable
Page 54 / 104
54
4021196 Rev B
Configure Security
Security > VPN
A Virtual Private Network (VPN) is a connection between two endpoints in different
networks that allows private data to be sent securely over public networks or other
private networks. This is accomplished by creating a "VPN tunnel." A VPN tunnel
connects the two PCs or networks and allows data to be transmitted over the
Internet as if it were on a private network. The VPN tunnel uses IPsec to encrypt the
data sent between the two endpoints and encapsulate the data within a normal
Ethernet/IP frame allowing the data to pass between networks securely and
seamlessly.
A VPN provides a cost-effective and more secure alternative to using a private,
dedicated, leased line for a private network. Using industry standard encryption and
authentication techniques, an IPsec VPN creates a secure connection that operates as
if you were directly connected to your local private network.
For example, a VPN allows users to sit at home and connect to his/her employer's
corporate network and receive an IP address in their private network just as though
they were sitting in their office connected to their corporate LAN.
Select the
VPN
tab to open the Security VPN page.
Use this page to configure the VPN for your residential gateway.
Page 55 / 104
4021196 Rev B
55
Configure Security
Security VPN Tunnel Page Description
Use the descriptions and instructions in the following table to configure the VPN
tunnel for your gateway. After you make your selections, click
Save Settings
to
apply your changes or
Cancel Changes
to cancel.
Section
Field Description
VPN Tunnel
Select Tunnel Entry
Allows you to display a list of created VPN tunnels
Create Button
Click this button to create a new tunnel entry
Delete Button
Click this button to delete all settings for the selected tunnel
Summary Button
Click this button to display the settings and status of all enabled tunnels
IPSec VPN Tunnel
Allows you to enable or disable Internet Security Protocol for the VPN tunnel
Tunnel Name
Enter the name for this tunnel
Local Secure
Group
Select the local LAN user(s) that can use this VPN tunnel. This may be a single IP
address or sub-network. Note that the Local Secure Group must match the remote
gateway's Remote Secure Group.
IP
Enter the IP address of the local network
Mask
If the Subnet option is selected, enter the mask to determine the IP address on the
local network
Remote
Secure
Group
Select the remote LAN user(s) behind the remote gateway who can use this VPN
tunnel. This may be a single IP address, a sub-network, or any addresses. If "Any"
is set, the Gateway acts as responder and accepts requests from any remote user.
Note that the Remote Secure Group must match the remote gateway's Local Secure
Group.
IP
Enter the IP address of the remote network
Mask
If the Subnet option is selected, enter the mask to determine the IP addresses on
the remote network

Rate

3.5 / 5 based on 2 votes.

Popular Cisco Models

Famous Router IPs
Famous Router Companies
Bookmark Our Site

Press Ctrl + D to add this site to your favorites!

Share
Top