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dhcp [2024/03/14 21:49]
114.119.158.167 old revision restored (2023/10/24 21:32) 		dhcp [2024/05/21 23:47]
127.0.0.1 external edit
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 ====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 
 + duplex auto 
 + speed auto 
 +end 
 + 
 +</code> 
 + 
 +====Show Commands==== 
 + 
 +===View Leases=== 
 +<code> 
 +R1#sh ip dhcp binding  
 +Bindings from all pools not associated with VRF: 
 +IP address          Client-ID/     Lease expiration        Type 
 +     Hardware address/ 
 +     User name 
 +172.16.0.2          0063.6973.636f.2d63.    Mar 01 2002 12:06 AM    Automatic 
 +                    3230.342e.3430.3930. 
 +                    2e30.3030.312d.4661. 
 +                    302f.31 
 +192.168.1.50        0063.6973.636f.2d63.    Mar 02 2002 12:01 AM    Automatic 
 +                    3230.332e.3366.6461. 
 +                    2e30.3030.302d.4661. 
 +                    302f.30 
 +</code> 
 + 
 +===Server Statistics=== 
 +<code> 
 +R1#sh ip dhcp server statistics  
 +Memory usage         25022 
 +Address pools        2 
 +Database agents      0 
 +Automatic bindings   2 
 +Manual bindings      0 
 +Expired bindings     0 
 +Malformed messages   0 
 +Secure arp entries   0 
 + 
 +Message              Received 
 +BOOTREQUEST          0 
 +DHCPDISCOVER         11 
 +DHCPREQUEST          1 
 +DHCPDECLINE          0 
 +DHCPRELEASE          0 
 +DHCPINFORM           0 
 + 
 +Message              Sent 
 +BOOTREPLY            0 
 +DHCPOFFER            8 
 +DHCPACK              1 
 +DHCPNAK              0 
 +</code> 
 + 
 +===Pool Stats=== 
 +Note that ''**excluded**'' address ranges are not deducted from the ''**Total addresses**'' field in the output. 
 +<code> 
 +R1#sh ip dhcp pool  
 + 
 +Pool LAN : 
 + Utilization mark (high/low)    : 100 / 0 
 + Subnet size (first/next)       : 0 / 0  
 + Total addresses                : 254 
 + Leased addresses               : 1 
 + Pending event                  : none 
 + 1 subnet is currently in the pool : 
 + Current index        IP address range                    Leased addresses 
 + 192.168.1.51         192.168.1.1      - 192.168.1.254     1 
 +</code>
dhcp.txt · Last modified: 2024/06/26 13:45 by 114.119.130.33 · Currently locked by: 3.145.8.27

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