sys sshd¶

sys sshd(1) BIG-IP TMSH Manual sys sshd(1)

NAME
sshd - Configures the Secure Shell (SSH) daemon for the BIG-IP(r) system.

MODULE
sys

SYNTAX
Configure the sshd component within the sys module using the syntax in the following sections.

MODIFY
modify sshd
options:
allow [add | delete | replace-all-with] {
[ [hostname] | [IP address] ] ...
}
allow none
banner [disabled | enabled]
banner-text [string]
inactivity-timeout [integer]
include [string]
login [disabled | enabled]
log-level [debug | debug1 | debug2 | debug3 | error | fatal |
info | quiet | verbose]
port [integer]

edit sshd
options:
all-properties
non-default-properties

DISPLAY
list sshd
list sshd [option]
show running-config sshd
show running-config sshd [option]
options:
all-properties
non-default-properties
one-line

DESCRIPTION
You can use the sshd component to configure a secure channel between the BIG-IP system and other devices.

F5 Networks recommends that users of the Configuration utility exit the utility before changes are made to the
system using the sshd component. This is because making changes to the system using this component causes a
restart of the sshd daemon. Likewise, restarting the sshd daemon creates the necessity for a restart of the
Configuration utility.

EXAMPLES
modify sshd allow add {192.168.0.0/255.255.0.0}

Creates an initial range of IP addresses (192.168.0.0 with a netmask of 255.255.0.0) that are allowed to log
in to the system.

modify sshd allow add {192.168.1.245}

Adds the IP address, 192.168.1.245, to the existing list of IP addresses that are allowed to log in to the
system.

modify sshd login enabled

Enables SSH login to the system.

modify sshd inactivity-timeout 3600

Sets an inactivity timeout of 60 minutes for SSH logins to the system.

modify sshd log-level error

Sets the sshd message log level to ERROR.

modify sshd banner enabled banner-text "NOTICE: Improper use of this computer may result in prosecution!"

Creates a banner that displays when a user attempts to log in to a system using SSH.

Note that you must enclose the banner text in double quotation marks, and then type single quotation marks
outside the double quotation marks. You can also use the backslash character to escape each quotation mark as
well as any other special characters that the system might process (for example, exclamation point !).

OPTIONS
allow
Configures servers in the /etc/hosts.allow file. The default value is all.

Warning: Using the value none resets the sshd daemon to allow all servers access to the system. F5
Networks recommends that you do not use the value none with the sshd component.

banner
Enables or disables the display of the banner text field when a user logs in to the system using SSH. The
default value is disabled.

banner-text
When the banner option is enabled, specifies the text to include in the banner that displays when a user
attempts to log on to the system.

fips-cipher-version
Read-only field for internal use. Non-zero value indicates that the list of ciphers has been set to FIPS
140-2 compliant defaults. The value 1 indicates that the list of ciphers is "aes128-cbc,aes256-cbc".
User changes to the list of ciphers will not affect the value of this field. This field is relevant only
when FIPS 140-2 compliance is enabled in the license.

inactivity-timeout
Specifies the number of seconds before inactivity causes an SSH session to log out. The default value is
0 (zero) seconds, which indicates that inactivity timeout is disabled.

include
Warning: Do not use this option without assistance from the F5 Technical Support team. The system does
not validate the commands issued using the include option. If you use this option incorrectly, you put
the functionality of the system at risk.

log-level
Specifies the minimum sshd message level to include in the system log. The possible values are:

debug - debug3
Indicates that the minimum sshd message level that the system logs is the specified debugging level
of messages.

error
Indicates that the minimum sshd message level that the system logs is error.

fatal
Indicates that the minimum sshd message level that the system logs is fatal.

info Indicates that the minimum sshd message level that the system logs is informational.

quiet
Indicates that the system does not log sshd messages.

verbose
Indicates that the system logs all sshd messages.

port Specifies the TCP port to run SSHD. It is a number in the range of 1 and 65535.

The default value is 22.