ASA 9.5 dhcp reservation

[ronald.su]

hi , my dhcp is on ASA5506, and the os ver is 9.5,  I want to bing a static IP to a MAC address in dhcp.

can I ? how?

thanks

[Karsten Iwen · Accepted solution]

1. Version 9.5 is not supported any more, you should move to 9.8(4).
2. The DHCP-server on the ASA is not a full featured server, there are a couple of limitations and reservations are one of these. Here is the corresponding config-guide with some more infos:

https://www.cisco.com/c/en/us/td/docs/security/asa/asa98/configuration/general/asa-98-general-config/basic-dhcp-ddns.html

[ronald.su]

if I upgrade to 9.8(4), the DHCP ip reservation still not support on ASA?

[Jay Johnston · Accepted solution]

This feature is now supported on ASA in version 9.13(1) and later

Example:

Magnus-5506-Desk# sh run dhcpd
dhcpd dns 192.168.1.22
dhcpd domain cisco.com
dhcpd option 4 ip 172.18.124.1
!
dhcpd address 192.168.100.100-192.168.100.200 inside
dhcpd enable inside
dhcpd reserve-address 192.168.100.199 ecb5.fa0f.988b inside
!
Magnus-5506-Desk#

[Yordan Yordanov]

Hi Jay,

the dhcp reservation doesnt work for me

asa5506 with 9.16(2)14

dhcpd domain xxxxxxxx
!
dhcpd address 192.168.1.50-192.168.1.250 inside
dhcpd dns 208.67.222.222 208.67.220.220 interface inside
dhcpd domain xxxxxxxxxxx interface inside
dhcpd enable inside
dhcpd reserve-address 192.168.1.170 78a5.dd3f.3641 inside

any idea?

br

Yordan

[AdamStewart0400]

Is it possible the device 78a5.dd3f.3641 had an existing Lease/ARP entry before applying the command?