Technical data

ServerIron ADX Administration Guide 93
53-1002434-01
Restricting remote access to management functions
2
Using ACLs to restrict remote access
You can use standard ACLs to control the following access methods to management functions on a
ServerIron:
• Telnet access
• SSH access
• Web management access
• SNMP access
To configure access control for these management access methods.
1. Configure an ACL with the IP addresses you want to allow to access the device
2. Configure a Telnet access group, SSH access group, web access group, and SNMP community
strings. Each of these configuration items accepts an ACL as a parameter. The ACL contains
entries that identify the IP addresses that can use the access method.
The following sections present examples of how to secure management access using ACLs.
Using an ACL to restrict Telnet access
To configure an ACL that restricts Telnet access to the device, enter commands such as the
following.
ServerIronADX(config)# access-list 10 deny host 209.157.22.32 log
ServerIronADX(config)# access-list 10 deny 209.157.23.0 0.0.0.255 log
ServerIronADX(config)# access-list 10 deny 209.157.24.0 0.0.0.255 log
ServerIronADX(config)# access-list 10 deny 209.157.25.0/24 log
ServerIronADX(config)# access-list 10 permit any
ServerIronADX(config)# telnet access-group 10
ServerIronADX(config)# write memory
Syntax: telnet access-group <num>
The <num> parameter specifies the number of a standard ACL and must be from 1 – 99.
The commands above configure ACL 10, then apply the ACL as the access list for Telnet access.
The device allows Telnet access to all IP addresses except those listed in ACL 10.
To configure a more restrictive ACL, create permit entries and omit the permit any entry at the end
of the ACL.
Example
ServerIronADX(config)# access-list 10 permit host 209.157.22.32
ServerIronADX(config)# access-list 10 permit 209.157.23.0 0.0.0.255
ServerIronADX(config)# access-list 10 permit 209.157.24.0 0.0.0.255
ServerIronADX(config)# access-list 10 permit 209.157.25.0/24
ServerIronADX(config)# telnet access-group 10
ServerIronADX(config)# write memory
The ACL in this example permits Telnet access only to the IP addresses in the permit entries and
denies Telnet access from all other IP addresses.
Using an ACL to restrict SSH access
To configure an ACL that restricts SSH access to the device, enter commands such as the following.