Add RAS

Last Updated : Aug 30, 2026 |
Navigation: System SettingsRAS
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Resource Id: sys_settings130

RAS

A Remote Access Server (RAS) is a piece of computer hardware which sits on a corporate LAN and into which employees dial on the public switched telephone network to get access to their email and to software and data on the corporate LAN.
This form is used to create a RAS service that the system offers Dial In users. A RAS service is needed when configuring modem dial in access, digital (ISDN) dial in access and a WAN link. Some systems may only require one RAS service since the incoming call type can be automatically sensed.
These settings are mergeable. Changes to these settings do not require a reboot of the system.
Field
Description
Name
A textual name for this service. If Encrypted Password below is used, this name must match the Account Name entered in the Service form.
Extension
Enter an extension number if this service is to be accessed internally.
COM Port
For future use.
TA Enable
Default = Off
Select to enable or disable - if enabled RAS will pass the call onto a TA port for external handling.
Encrypted Password
Default = Off
This option is used to define whether Dial In users are asked to use PAP or CHAP during their initial log in to the RAS Service. If the Encrypted Password box is checked then Dial In users are sent a CHAP challenge, if the box is unchecked PAP is used as the Dial In Authorization method.

PPP

PPP (Point-to-Point Protocol) is a Protocol for communication between two computers using a Serial interface, typically a personal computer connected by phone line to a server.
These settings are mergeable. Changes to these settings do not require a reboot of the system.
Field
Description
CHAP Challenge Interval (secs)
Default = 0 (disabled). Range = 0 to 99999 seconds.
The period between successive CHAP challenges. Blank or 0 disables repeated challenges.
Header Compression
Default = Off
Enables the negotiation and use of IP Header Compression as per RFC2507, RFC2508 and RFC2509.
PPP Compression Mode
Default = MPPC This option is used to negotiate compression (or not) using CCP. If set to MPPC or StacLZS the system will try to negotiate this mode with the remote Control Unit. If set to Disable CCP is not negotiated. The options are:
  • Disable Do not use or attempt to use compression.
  • StacLZS Attempt to use and negotiate STAC compression (the standard, Mode 3)
  • MPPC Attempt to use and negotiate MPPC (Microsoft) compression. Useful for dialing into NT Servers.
PPP Callback Mode
Default = Disable
The options are:
  • Disable: Callback is not enabled
  • LCP: (Link Control Protocol) After authentication the incoming call is dropped and an outgoing call to the number configured in the Service will be made to reestablish the link.
  • Callback CP: (Microsoft's Callback Control Protocol) After acceptance from both ends the incoming call is dropped and an outgoing call to the number configured in the Service is made to reestablish the link.
  • Extended CBCP: (Extended Callback Control Protocol) Similar to Callback CP however the Microsoft application at the remote end will prompt for a telephone number. An outgoing call will then be made to that number to reestablish the link.
Data Pkt. Size
Default = 0. Range = 0 to 2048.
This is the number of data bytes contained in a Data Packet.
BACP
Default = Off
Allows negotiation of the BACP/BCP protocols. These are used to control the addition of additional B channels to simultaneously improve data throughput.
Multilink
Default = Off
When enabled the system attempts to negotiate the use of the Multilink protocol (MPPC) on the link(s) into this Service. Multilink must be enabled if the more than one channel is allowed to be Bundled/Multilinked to this RAS Service.
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RAS