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dhcp

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dhcp [2024/03/14 22:05]
114.119.155.78 old revision restored (2022/09/11 17:01) 		dhcp [2024/05/05 02:05] (current)
216.244.66.196 old revision restored (2023/12/30 16:47)
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 =====DHCP===== =====DHCP=====
 +Use DHCP to address automatic IP assignment within a network.
 +
 ====Configuration==== ====Configuration====
 Below is the configuration for DHCP in Cisco's IOS.  Below is the configuration for DHCP in Cisco's IOS. 
  
 <code> <code>
-R1(dhcp-config)#do sh run | s dhcp  +R1#sh run | s dhcp 
-no ip dhcp use vrf connected +ip dhcp excluded-address 192.168.0.1 192.168.0.49 
-ip dhcp excluded-address 192.168.1.1 192.168.1.49    # exclude range START STOP +ip dhcp pool MYNETWORK 
-ip dhcp excluded-address 172.16.0.1                  # exclude single ADDR +   network 192.168.0.0 255.255.255.0 
-ip dhcp pool LAN                                     # Define a pool +   default-router 192.168.0.1  
-   network 192.168.1.0 255.255.255.0                 # Network scope to lease from +R1#
-   next-server 1.2.3.4                               # TFTP Server Opt +
-   default-router 192.168.1.1                        # Default GW +
-   dns-server 192.168.1.1                            # Default DNS +
-   lease 0 23 59                                     # Lease DAYS HRS MINS+
 </code> </code>
  
 ====DHCP Relay==== ====DHCP Relay====
 Relays are configured with **''ip helper-address x.x.x.x''** to specify which address to forward received DHCP requests. When our RTR forwards a DHCP request out via Relay, it does so with the **''SOURCE ADDRESS''** of the ''**INTERFACE**'' the ''**HELPER-ADDRESS**'' command was configured on. When this happens, the DHCP server can look at the ''**SOURCE ADDR**'' of the packet, and know exactly which scope to lease an address from - the same network that source resides in, ofc. Relays are configured with **''ip helper-address x.x.x.x''** to specify which address to forward received DHCP requests. When our RTR forwards a DHCP request out via Relay, it does so with the **''SOURCE ADDRESS''** of the ''**INTERFACE**'' the ''**HELPER-ADDRESS**'' command was configured on. When this happens, the DHCP server can look at the ''**SOURCE ADDR**'' of the packet, and know exactly which scope to lease an address from - the same network that source resides in, ofc.
- 
-The helper address is configured on the interface connected to the subnet which does not contain the DHCP server. 
-<code> 
-interface FastEthernet0/1 
- ip address 172.16.0.1 255.255.255.0 
- ip helper-address 192.168.1.1           # Specifies Server to forward requests to 
- duplex auto 
- speed auto 
-end 
- 
-</code> 
  
 ====Show Commands==== ====Show Commands====
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 ===Pool Stats=== ===Pool Stats===
-Note that ''**excluded**'' address ranges are not deducted from the ''**Total addresses**'' field in the output. 
 <code> <code>
 R1#sh ip dhcp pool  R1#sh ip dhcp pool 
dhcp.1710453900.txt.gz · Last modified: 2024/03/14 22:05 by 114.119.155.78

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