Black Box 16 port User Manual
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Configuring SLIP

cli syntax:

To configure the SLIP parameters proceed as follows;

set slip line,

1. From the Line Configuration menu, select ‘SLIP’ and then select a line.

show slip

 

line

The SLIP form is now displayed (default values shown):

2.

Within the SLIP form, set the parameters listed in the next table:

 

 

Option

Description

 

 

Local ip address

This is the IP address of the unit end of the SLIP link. For routing to work you

 

must enter an IP address in this field. Choose an address which is part of the

 

same network or subnetwork as the remote end; e.g. if the remote end is address

 

192.101.34.146, your local ip address may be 192.101.34.145; (in the cli,

 

example syntax would be:

 

set slip li 1 lipaddr 192.101.34.145)

 

Do not use the unit’s (main) ip address in this field; if you do so, routing will not

 

take place correctly.

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Option

Description

Remote ip address This is the IP address of the remote end of the SLIP link. This must be specified. Choose an address which is part of the same network or subnetwork as the unit (see comment in‘Local ip address’ above). Enter the remote ip address in dot notation, e.g.192.101.34.146

(or in the cli, example syntax would be: set slip li 5 ripaddr 192.101.34.146)

 

If your user is authenticated by the unit this remote ip address will be overridden

 

if you have set a ‘framed ip’ address for the user with values other than

 

255.255.255.254 or 255.255.255.255; see Configuring a user account on page

 

100,sub-section‘framed ip’.

 

If your user is authenticated by RADIUS and the RADIUS parameter ‘Framed-

 

Address’ is set in the RADIUS file the unit will use the value in the RADIUS

 

file in preference to the ‘Remote ip address’ value configured here.

Subnet Mask

this is the subnet mask of the node on the remote end of the SLIP link. This field

 

is optional. This parameter should be entered in dot notation e.g.

 

255.255.255.224

 

If your user is authenticated by RADIUS and the RADIUS parameter ‘Framed-

 

Netmask’ is set in the RADIUS file the unit will use the value in the RADIUS

 

file in preference to the ‘Subnet Mask’ value configured here.

Maximum

The Maximum Transmission Unit (mtu) parameter restricts the size of

transmission unit

individual SLIP packets being sent by the unit. Enter a value in bytes between

 

256 and 1006, e.g. 512 (in the cli, example syntax would be: set slip li 1 mtu

 

512). The default value is 256. For more information on this parameter see

 

Configuring a user account on page 100, sub-section ‘framed mtu’.

 

If your user is authenticated by the unit this mtu value will be overridden when

 

you have set a ‘framed mtu’ value for the user; see Configuring a user account on

 

page 100,sub-section‘framed mtu’.

 

If your user is authenticated by RADIUS and the RADIUS parameter ‘Framed-

 

MTU’ is set in the RADIUS file the unit will use the value in the RADIUS file

 

in preference to the ‘mtu’ value configured here.

Suppress icmp

This option causes ICMP (Internet Control Management Protocol) packets

 

directed to this SLIP link to be discarded. The possible values are ‘on’ and ‘off’;

 

the default is off.

Interactive

This determines whether interactive traffic (e.g. telnet sessions) is given priority

priority

over batch type traffic (e.g. ftp) thus avoiding the situation where a user has to

 

wait for their character to be echoed while several large ftp packets are

 

transferred. The possible values are ‘on’ and ‘off’; the default is on.

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Option

Description

 

 

VJ Compression

This determines whether Van Jacobson compression is used on this link; i.e.

 

whether you are using SLIP or C-SLIP(compressed SLIP). The choices are ‘on’

 

(C-SLIP)or ‘off’ (SLIP); the default is ‘on’. Select ‘on’ will turn on VJ

 

compression. C-SLIPgreatly 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 slip 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.

TX parameters

Meaning Transmit parameters. This will output to the screen of the user all the

 

SLIP parameters configured for that line/port. TX parameters are useful in some

 

applications such as Trumpet Winsock. Options are ‘on’ or ‘off’.

 

 

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