Time Based Access Control List:
Time based ACL are just like normal Extended ACL but in this we define time-range which defines duration for which ACL is going to work.
To configure these ACL we need to configure Time-Range and define time in that Time-Range.
Time range are of two types
• Absolute time-Range
• Periodic Time-Range
Absolute Time-Range: In this duration of time is fixed throughout the time-range defined.
Periodic Time-Range: In this duration is periodic and can be set according to the requirement in our time range.
Note: Time of all the device should be synchronized
According to our topology, we have telnet and ssh client which are going to access telnet and ssh server, we are going to restrict each client to not to be able to perform other service using time-based ACL
Please follow topology for reference.
In global configuration mode we created two time range named CISCO and ABCD by following configuration:
R1(config-time-range)#absolute start 11:30 10 april 2017 end 11:35 10 april 2017
R1(config-time-range)#periodic weekdays 11:30 to 11:35
Now we are going to call these Time-Range in Extended ACL
by following commands for restricting traffic of each client:
R1(config)#ip access-list extended TELNET/SSH
R1(config-ext-nacl)#deny tcp host 192.168.101.200 host 220.127.116.11 eq 23 time-range CISCO
R1(config-ext-nacl)#deny tcp host 192.168.101.100 host 18.104.22.168 eq 22 time-range ABCD
R1(config-ext-nacl)#permit ip any any
Now we apply ACL on interface for restricting traffic to go past R1
and reach Telnet/SSH server.
R1(config-if)#ip access-group TELNET/SSH in
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