Cisco Routers
Cisco Routers Commands
Enable commands
- en
Show MAC address table
- show mac-address-table
Show VLAN Information
- show vlan brief
Show IP address assignments and status of interfaces
- show ip interface brief
Show DHCP info
- show ip dhcp pool
Show which IP addresses are associated with which MAC addresses
- show ip dhcp binding
Show DHCP errors / IP conflicts
- show ip dhcp conflict
Show NAT translation table
- show ip nat translations
- show ip nat statistics
Show ARP cache
- show arp
Clear arp cache
- clear arp-cache
Put into config mode
- conf t
Create VLAN
- vlan
- name
- exit
Configure VLAN
- interface range Gig
- switchport mode access
- switchport access vlan
- end
Show interfaces command - shows trunks
- show interfaces trunk
Configure Trunk
- interface gig
- switchport trunk encapsulation dot1q
- switchport mode trunk
- end
Write command - write config to memory to keep changes after reboot
- wr
shutdown port
- conf t
- int
- g
- shutdown
Enable port
- conf t
- int
- g
- no shutdown
Port mirroring
- monitor session source int g
- monitor session destination int g
Show IP Routes
- show iproute
Configure route
- conf t
- ip route
Copy running config to flash memory
- copy run flash
VPN Commands
Check status of VPN
Phase 1:
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Phase 2
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Verify Crypto Map Configuration:
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Check active connections:
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Change peer IP of VPN
To change the peer of a configured VPN you will need to enable the configuration in the terminal
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Then you will need to select the VPN tunnel to change:
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You will need to update the shared key used for connections to the new peer ip:
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You will also need to remove the previous peer IP from the crypto map:
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DNS Commands
To setup a Router as a DNS Client:
- ip domain-lookup
- ip name-server
- ip domain-name
- ip domain-list
To setup as a server use these commands additionally:
- ipdns server
- ip host