D-Link Router DIR-855 User Manual

							47D-Link DIR-855 User Manual
Section 3 - Configuration
Application Level Gateway Configuration
Here you can enable or disable ALG’s. Some protocols and applications require special handling of the IP payload to make them work 
with network address translation (NAT). Each ALG provides special handling for a specific protocol or application. A number of ALGs 
for common applications are enabled by default.
Allows multiple machines on the LAN to connect to their corporate networ\
k using PPTP protocol. 
Allows multiple VPN clients to connect to their corporate network using IPSec. Some VPN clients support traversal of IPSec through NAT. 
This ALG may interfere with the operation of such VPN clients. If you are having trouble connecting with your corporate network, try turning 
this ALG off. Please check with the system administrator of your corpora\
te network whether your VPN client supports NAT traversal.
Allows application that uses Real Time Streaming Protocol to receive streaming media from the Internet. QuickTime and Real Player are 
some of the common applications using this protocol.
Allows devices and applications using VoIP (Voice over IP) to communicate across NAT. Some VoIP applications and devices have the 
ability to discover NAT devices and work around them. This ALG may interfere with the operation of such devices. If you are having trouble 
making VoIP calls, try turning this ALG off.
PPTP:
IPSEC (VPN):
RTSP:
SIP: 
						

							48D-Link DIR-855 User Manual
Section 3 - Configuration
Enter  the  IP  address  of  packets  that  will  take  this 
route.
Enter the netmask of the route, please note that the 
octets must match your destination IP address.
Enter your next hop gateway to be taken if this route 
is used.
The route metric is a value from 1 to 16 that indicates 
the cost of using this route. A value 1 is the lowest 
cost and 15 is the highest cost. 
Select the interface that the IP packet must use to 
transit out of the router when this route is used. 
Destination IP:
Netmask:
Gateway:
Metric:
Interface:
Routing
The Routing option is an advanced method of customizing specific routes of data through your network. 
						

							49D-Link DIR-855 User Manual
Section 3 - Configuration
Set the transmit power of the antennas.
Beacons  are  packets  sent  by  an  Access  Point  to 
synchronize a wireless network. Specify a value. 100 
is the default setting and is recommended. 
This value should remain at its default setting of 2432. 
If  inconsistent  data  flow  is  a  problem,  only  a  minor 
modification should be made.
The  fragmentation  threshold,  which  is  specified  in 
bytes, determines whether packets will be fragmented. 
Packets  exceeding  the  2346  byte  setting  will  be 
fragmented  before  transmission.  2346  is  the  default 
setting. 
(Delivery Traffic Indication Message) 3 is the default setting. A DTIM is a countdown informing clients of the next window for listening to 
broadcast and multicast messages.
When checked, it will disable the ability for computers on the wireless network from seeing each other, but will allow you to see computers 
on the wired network.
WMM is QoS for your wireless network. This will improve the quality of v\
ideo and voice applications for your wireless clients.
Enable this option to prevent associated wireless clients from communica\
ting with each other.
Check this box to reduce the guard interval time therefore increasing the data capacity. However, it’s less reliable and may create higher 
data loss.
Transmit Power:
Beacon Period:
RTS Threshold:
Fragmentation 
Threshold:
DTIM Interval:
Wireless Isolation:
WMM Function:
WLAN Partition:
Short GI:
Advanced Wireless Settings
802.11n/g (2.4GHz) 
						

							50D-Link DIR-855 User Manual
Section 3 - Configuration
Advanced Wireless Settings
802.11n/a (5GHz)
Set the transmit power of the antennas.
Beacons  are  packets  sent  by  an  Access  Point  to 
synchronize  a  wireless  network.  Specify  a  value.  100 
is the default setting and is recommended. 
This value should remain at its default setting of 2432. 
If  inconsistent  data  flow  is  a  problem,  only  a  minor 
modification should be made.
The fragmentation threshold, which is specified in bytes, 
determines whether packets will be fragmented. Packets 
exceeding  the  2346  byte  setting  will  be  fragmented 
before transmission. 2346 is the default setting. 
(Delivery  Traffic  Indication  Message)  3  is  the  default 
setting. A DTIM is a countdown informing clients of the 
next  window  for  listening  to  broadcast  and  multicast 
messages.
When checked, it will disable the ability for computers on the wireless network from seeing each other, but will allow you to see computers 
on the wired network.
WMM is QoS for your wireless network. This will improve the quality of v\
ideo and voice applications for your wireless clients.
Enable this option to prevent associated wireless clients from communica\
ting with each other.
Check this box to reduce the guard interval time therefore increasing the data capacity. However, it’s less reliable and may create higher 
data loss.
Transmit Power:
Beacon Period:
RTS Threshold:
Fragmentation 
Threshold:
DTIM Interval:
Wireless Isolation:
WMM Function:
WLAN Partition:
Short GI: 
						

							51D-Link DIR-855 User Manual
Section 3 - Configuration
WISH Settings
WISH  is  short  for  Wireless  Intelligent  Stream  Handling,  a  technology  developed  to  enhance  your  experience  of  using  a  wireless 
network by prioritizing the traffic of different applications. 
Enable  this  option  if  you  want  to  allow  WISH  to 
prioritize your traffic. 
Enable WISH:
Allows  the  router  to  recognize  HTTP  transfers 
for  many  common  audio  and  video  streams  and 
prioritize them above other traffic. Such streams are 
frequently used by digital media players. 
HTTP:
Enables  the  router  to  recognize  certain  audio  and 
video streams generated by a Windows Media Center 
PC and to prioritize these above other traffic. Such 
streams  are  used  by  systems  known  as  Windows 
Media Extenders, such as the Xbox 360. 
Windows Media 
Center:
When  enabled,  this  option  causes  the  router  to 
automatically  attempt  to  prioritize  traffic  streams 
that  it  doesn’t  otherwise  recognize,  based  on 
the  behaviour  that  the  streams  exhibit.  This  acts 
to  deprioritize  streams  that  exhibit  bulk  transfer 
characteristics, such as file transfers, while leaving 
interactive traffic, such as gaming or VoIP, running 
at a normal priority.
Automatic:
WISH Rules:A WISH Rule identifies a specific message flow and assigns a priority to that flow. For most applications, the priority classifiers ensure 
the right priorities and specific WISH Rules are not required. 
WISH supports overlaps between rules. If more than one rule matches for a specific message flow, the rule with the highest priority will 
be used.  
						

							52D-Link DIR-855 User Manual
Section 3 - Configuration
Create  a  name  for  the  rule  that  is  meaningful  to 
you.
Name:
The  priority  of  the  message  flow  is  entered  here. 
The four priorities are defined as:
BK: Background (least urgent)
BE: Best Effort.
VI: Video
VO: Voice (most urgent)
Priority:
The protocol used by the messages. Protocol:
The rule applies to a flow of messages for which one computer’s IP address falls within the range set here.  Host IP Range:
The rule applies to a flow of messages for which host’s port number is within the range set here. Host Port Range: 
						

							53D-Link DIR-855 User Manual
Section 3 - ConfigurationUPnP
Internet Ping Block
Internet Port Speed
Multicast Streams
To  use  the  Universal  Plug  and  Play  (UPnP™)  feature 
click  on Enabled.  UPNP  provides  compatibility  with 
networking equipment, software and peripherals.
Unchecking the box will not allow the DIR-855 to respond 
to  pings.  Blocking  the  Ping  may  provide  some  extra 
security from hackers. Check the box to allow the Internet 
port to be “pinged”.
Select  from  the  drop-down  menu  if  you  would  like  to 
apply the Inbound Filter to the WAN ping. Refer to page 
44 for more information regarding Inbound Filter.
You  may  set  the  port  speed  of  the  Internet  port  to 
10Mbps,  100Mbps,  or  auto.  Some  older  cable  or  DSL 
modems  may  require  you  to  set  the  port  speed  to 
10Mbps.
Check the box to allow multicast traffic to pass through 
the router from the Internet.
Enable UPnP:
WAN Ping:
WAN Ping 
Inbound Filter:
WAN Port Speed:
Multicast 
streams:
Advanced Network Settings 
						

							54D-Link DIR-855 User Manual
Section 3 - Configuration
Administrator Settings
This page will allow you to change the Administrator and User passwords. You can also enable Remote Management.  There are two 
accounts that can access the management interface through the web browser. The accounts are admin and user. Admin has read/
write access while user has read-only access. User can only view the settings but cannot make any changes. Only the admin account 
has the ability to change both admin and user account passwords.
Enter a new password for the Administrator Login Name. The administrator can make 
changes to the settings.
Enter the new password for the User login. If you login as the User, you cannot change 
the settings (you can only view them).
Enter a name for the DIR-855 router.
Enables  a  challenge-response  test  to  require  users  to  type  letters  or  numbers  from  a 
distorted  image  displayed  on  the  screen  to  prevent  online  hackers  and  unauthorized 
users from gaining access to your router’s network settings.
Check to enable HTTPS to connect to the router securely.
Remote management allows the DIR-855 to be configured from the Internet by a web 
browser. A username and password is still required to access the Web-Management 
interface. In general, only a member of your network can browse the built-in web pages 
to  perform  Administrator  tasks.  This  feature  enables  you  to  perform  Administrator 
tasks from the remote (Internet) host.
The port number used to access the DIR-855.
Admin Password:
User Password:
Gateway Name:
Enable Graphical 
Authentication:
Enable HTTPS 
Server:
Enable Remote 
Management:
Remote Admin 
Inbound Filter:
Details:
Example: http://x.x.x.x:8080 whereas x.x.x.x is the Internet  IP address of the DIR-855 and 8080 is the port used for the Web Management 
interface. If you have enabled HTTPS Server and checked Use HTTPS, you must enter https:// as part of the URL to access the router 
remotely.
This section will list any rules that are created. You may click the Edit icon to change the settings or enable/disable the rule, or click the 
Delete icon to remove the rule. 
						

							55D-Link DIR-855 User Manual
Section 3 - Configuration
Time Settings
Select the Time Zone from the drop-down menu.
To  select  Daylight  Saving  time  manually,  select 
enabled or disabled, and enter a start date and an 
end date for daylight saving time.
NTP  is  short  for  Network  Time  Protocol.  NTP 
synchronizes  computer  clock  times  in  a  network 
of computers. Check this box to use a NTP server. 
This  will  only  connect  to  a  server  on  the  Internet, 
not a local server.
Enter the NTP server or select one from the drop-
down menu.
To manually input the time, enter the values in these 
fields for the Year, Month, Day, Hour, Minute, and 
Second and then click Set Time. You can also click 
Copy Your Computer’s Time Settings.
Time Zone:
Daylight Saving:
Enable NTP Server:
NTP Server Used:
Manual:
The Time Configuration option allows you to configure, update, and maintain the correct time on the internal system clock. From this 
section you can set the time zone that you are in and set the Time Server. Daylight Saving can also be configured to automatically 
adjust the time when needed. 
						

							56D-Link DIR-855 User Manual
Section 3 - Configuration
SysLog
The Broadband Router keeps a running log of events and activities occurring on the Router. You may send these logs to a SysLog 
server on your network.
Enable Logging to 
SysLog Server:
SysLog Server IP 
Address:
Check this box to send the router logs to a SysLog 
Server.
The address of the SysLog server that will be used 
to send the logs. You may also select your computer 
from the drop-down menu (only if receiving an IP 
address from the router via DHCP).