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Black Box Console Server user guide 88
Protocol
compression
This determines whether compression of the PPP Protocol field shall take place on
this link. The choices are ‘on’ or ‘off’; the default is ‘on’. For most applications this
should be enabled; i.e. ‘on’. In the cli example syntax would be:
set ppp li 1 proto_comp on.
VJ Comp This determines whether Van Jacobson Compression is used on this link. The choices
are ‘on’ or ‘off’; the default is ‘on’. Select ‘on’ will turn on VJ compression. Select
‘on’ will turn on VJ compression. C-SLIP greatly improves the performance of
interactive traffic, such as Telnet or Rlogin; see Configuring a dial in line on page 74
for more information. In the cli, example syntax would be: set ppp li 1 vj on.
If your user is authenticated by the unit this VJ compression value will be overridden
if you have set a ‘framed compression’ value for a user; see Configuring a user
account on page 100, sub-section ‘framed compression’.
If your user is authenticated by RADIUS and the RADIUS parameter ‘Framed-
Compression’ is set in the RADIUS file the unit will use the value in the RADIUS
file in preference to the ‘VJ compression’ value configured here.
Magic No.
negotiation
This is a mechanism whereby a line can determine if it has been looped back. The
choices are ‘on’ or ‘off’; the default is ‘off’. If enabled (on) this option allows the
sending of random numbers on the link. The random numbers should be different,
unless the link has been looped back. In the cli, example syntax would be: set ppp li 1
magic_neg off.
IP address
negotiation
This parameter specifies whether or not IP address negotiation shall take place. IP
address negotiation is where the unit allows the remote end to specify its ip address.
The values are ‘on’ or ‘off’. The default value is ‘off’.
If set to ‘on’ the unit allows the remote end to specify its ip address; the ip address
specified by the remote end will then be used in preference to the Remote ip address
set for a line.
If set to ‘off’ the unit will not allow the remote end to specify its ip address. The
Remote ip address set for the line will be used.
In the cli, example syntax would be: set ppp li 7 ipaddr_neg on.
When configuring your user (Configuring a user account on page 100), if you set
‘framed ip’ address to 255.255.255.255, the unit will override the value for IP
address negotiation set here. The result is that the unit will allow the remote end to
specify its ip address.