[CCNA] Rangkuman konfigurasi Cisco #4

Access Control Lists:

Standard ACL: 1 – 99 and 1300 – 1999

• Use a remark to describe the ACL (Optional):

1	R1(config)# access-list 1 remark ACL TO DENY ACCESS FROM SALES VLAN

• Create the ACL, keeping the following in mind:
• ACL uses first-match logic.
• There is an implicit deny anyat the end of the ACL.

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R1(config)# access-list 2 deny 192.168.1.77 R1(config)# access-list 2 deny 192.168.1.64 0.0.0.31 R1(config)# access-list 2 permit 10.1.0.0 0.0.255.255 R1(config)# access-list 2 deny 10.0.0.0 0.255.255.255 R1(config)# access-list 2 permit any

• Enable the ACL on the chosen router interface in the correct direction (in or out):

1	R1(config-if)# ip access-group 2 out

• Using standard ACL to limit telnet and SSH access to a router:

Create the ACL that defines the permitted telnet clients:

1 2	R1(config)# access-list 99 remark ALLOWED TELNET CLIENTS R1(config)# access-list 99 permit 192.168.1.128 0.0.0.15

Apply the ACL inbound the vty lines

1 2	R1(config)# line vty 0 4 R1(config-line)# access-class 99 in

Extended ACL: 100 – 199 and 2000 – 2699

• Extended ACL should be placed as close as possible to the source of the packet.
• Extended ACL matches packets based on source & des.IP addresses, protocol, source & des. Port numbers andother criteria as well

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R1(config)# access-list 101 remark MY_ACCESS_LIST R1(config)# access-list 101 deny iphost 10.1.1.1 host 10.2.2.2 R1(config)# access-list 101 deny tcp 10.1.1.0 0.0.0.255 any eq 23 R1(config)# access-list 101 deny icmp 10.1.1.1 0.0.0.0 any R1(config)# access-list 101 deny tcphost 10.1.1.0 host 10.0.0.1 eq 80 R1(config)# access-list 101 deny udphost 10.1.1.7 eq 53 any R1(config)# access-list 101 permit ip any any R1(config)# interface fastEthernet 0/0 R1(config-if)# ip access-group 101 in

Named ACL:

• Named ACLs use names to identify ACLs rather than numbers, and commands that permit or deny traffic are written in a sub mode called named ACL mode (nacl).
• Named ACL enables the editing of the ACL (deleting or inserting statements) by sequencing statements of the ACL.

• Named standard ACL:

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R1(config)# ip access-list standard MY_STANDARD_ACL R1(config-std-nacl)# permit 10.1.1.0 0.0.0.255 R1(config-std-nacl)# deny 10.2.2.2 R1(config-std-nacl)# permit any R1(config)# interface fastEthernet 0/1 R1(config-if)# ip access-group MY_STANDARD_ACL out

• Named extended ACL:

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R1(config)# ip access-list extended MY_EXTENDED_ACL R1(config-ext-nacl)# deny icmp 10.1.1.1 0.0.0.0 any R1(config-ext-nacl)# deny tcphost 10.1.1.0 host 10.0.0.1 eq 80 R1(config-ext-nacl)# permit ip any any R1(config)# interface fastEthernet 0/1 R1(config-if)# ip access-group MY_EXTENDED_ACL in

• Editing ACL using sequence numbers:

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R1(config)# ip access-list extended MY_EXTENDED_ACL R1(config-ext-nacl)# no 20    ! Deletes the statement of sequence number 20 R1(config)# ip access-list standard 99 R1(config-std-nacl)# 5 deny 1.1.1.1    ! inserts a statement with sequence 5

Verifying ACLs:

• Shows all ACLs configured on a router with counters at the end of each statement:

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R1# show access-lists ! OR R1# show ip access-list

• Shows only the specified ACL:

1	R1# show ip access-list 101

• Includes a reference to the ACLs enabled on that interface either in or out:

1	R1# show ip interface f0/0

DHCP Server

• Define a DHCP pool and give it a name:

1	R1(config)# ip dhcp pool MY_POOL

• Define network and mask to use in this pool and the default gateway:

1 2	R1(dhcp-config)# network 192.168.1.0 255.255.255.0 R1(dhcp-config)# default-router 192.168.1.1

• Define one or more DNS server (OPTIONAL):

1	R1(dhcp-config)# dns-server 213.131.65.20 8.8.8.8

• Confine the lease time (OPTIONAL):

1	R1(dhcp-config)lease 2    ! Days

• Define one or more scopes of excluded (reserved) addresses (OPTIONAL):

1 2	R1(config)# ip dhcp excluded-address 192.168.1.1 192.168.1.100 R1(config)# ip dhcp excluded-address 192.168.1.200 192.168.1.254

DHCP Verification and Troubleshooting:

• Shows the status of the specified pool and the leased addresses from that pool:

1	R1# show ip dhcp pool POOL_1

• Shows all the leased ip addresses from all configured DHCP pools:

1	R1# show ip dhcp binding

• Shows any conflicts that occurred:

1	R1# show ip dhcp conflict

Enjoy !

Sumber : http://m-shohiburridak.blogspot.com/2015/05/ccna-rangkuman-konfigurasi-cisco.html

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