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dhcp

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dhcp [2024/03/14 21:48]
114.119.130.33 old revision restored (2023/10/26 14:34) 		dhcp [2024/05/05 02:05] (current)
216.244.66.196 old revision restored (2023/12/30 16:47)
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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.
 +
 +====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===
 +<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.1710452900.txt.gz · Last modified: 2024/03/14 21:48 by 114.119.130.33

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