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Filtering IP Addresses for Management Access
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CLI – This example enables SSH, sets the authentication parameters, and displays
the current configuration. It shows that the administrator has made a connection via
SHH, and then disables this connection.
Filtering IP Addresses for Management Access
You can create a list of up to 16 IP addresses or IP address groups that are allowed
management access to the switch through the web interface, SNMP, or Telnet.
Command Usage
• The management interfaces are open to all IP addresses by default. Once you add
an entry to a filter list, access to that interface is restricted to the specified
addresses.
• If anyone tries to access a management interface on the switch from an invalid
address, the switch will reject the connection, enter an event message in the
system log, and send a trap message to the trap manager.
• IP address can be configured for SNMP, web and Telnet access respectively. Each
of these groups can include up to five different sets of addresses, either individual
addresses or address ranges.
• When entering addresses for the same group (i.e., SNMP, web or Telnet), the
switch will not accept overlapping address ranges. When entering addresses for
different groups, the switch will accept overlapping address ranges.
• You cannot delete an individual address from a specified range. You must delete
the entire range, and reenter the addresses.
• You can delete an address range just by specifying the start address, or by
specifying both the start address and end address.
Command Attributes
• Web IP Filter – Configures IP address(es) for the web group.
• SNMP IP Filter – Configures IP address(es) for the SNMP group.
• Telnet IP Filter – Configures IP address(es) for the Telnet group.
• IP Filter List – IP address which are allowed management access to this interface.
• Start IP Address – A single IP address, or the starting address of a range.
Console(config)#ip ssh server 41-17
Console(config)#ip ssh timeout 100 41-18
Console(config)#ip ssh authentication-retries 5 41-19
Console(config)#ip ssh server-key size 512 41-19
Console(config)#end
Console#show ip ssh 41-22
SSH Enabled - version 2.0
Negotiation timeout: 120 secs; Authentication retries: 3
Server key size: 768 bits
Console#show ssh 41-22
Information of secure shell
Session Username Version Encrypt method Negotiation state
------- -------- ------- -------------- -----------------
0 admin 2.0 cipher-3des session-started
Console#disconnect 0 36-9
Console#