Question

Cisco Router - Static DHCP Mappings with an Origin File

Asked by: MrPrince

Hi,
Im testing the DHCP static mappings using an origin file instead of a pool per static IP. The pertinent parts of my config concerning DHCP is printed below along with my origin file:

Config:

!
ip dhcp pool 802.11g_WPA
 network 192.168.1.0 255.255.255.248
 dns-server 64.59.114.18 64.59.114.19
 default-router 192.168.1.6
 lease 0 5
 exit
!
ip dhcp pool 802.11g_WPA2
 network 192.168.2.0 255.255.255.248
 dns-server 64.59.114.18 64.59.114.19
 default-router 192.168.2.6
 lease 0 5
 exit
!
ip dhcp pool Static_Mappings
 origin file tftp://192.168.2.6/80211g_WPA2.txt
 exit
!

Origin File:

Dec 29 2008 08:30 PM
1
!IP Address -- Type -- MAC Address -- Lease expiration
192.168.1.3 /29 id 0100.1d72.503b.ca infinite
192.168.2.3 /29 id 0100.c09f.f958.ac infinite

Its not working. Can anyone point me in the right direction? Also I want the Origin file to reside in flash not on a tftp server. Ive read this Cisco document:
 http://www.cisco.com/en/US/docs/ios/12_3t/12_3t11/feature/guide/gtdhcpsm.html#wp1053415
Thanks.

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Asked On
2009-01-26 at 09:48:55ID24084132
Topic

Network Routers

Participating Experts
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Comments
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Answers

 

by: that1guy15Posted on 2009-01-27 at 10:08:21ID: 23479287

are you sure the router can connect to the txt file on the tftp server? To move the file over to your flash just use the copy command. Just make sure you have enough room in flash for the file

copy tftp flash:

Then change your config to point DHCP to the new location of the origin file.

Also not sure if this matters but I see a few differences in your origin file and what cisco says for the requirements

*time* Jan 21 2005 03:52 PM    <-----timestamp and version must be in here in order for the DB to reconize a new file to use
 
*version* 2
 
!IP address    Type      Hardware address               Lease expiration
 
10.0.0.4 /24         1            0090.bff6.081e                   Infinite
 
10.0.0.5 /28         id           00b7.0813.88f1.66             Infinite
 
10.0.0.2 /21         1            0090.bff6.081d                  Infinite
 
*end* <-----make sure this is at the end of your file

                                              
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by: MrPrincePosted on 2009-01-27 at 15:28:43ID: 23482270

I copied over the txt file to flash -

ip dhcp pool Static_Mappings
 origin file flash:/origins/80211g_WPA2.txt

Still no difference, I then amended the file itself to include the *end* and others like it but again no joy.

 

by: MrPrincePosted on 2009-03-16 at 23:27:00ID: 23905065

Seems it won't work unless the origin file is in the root. Also in order to get it to work one must restart the DHCP service.

20120131-EE-VQP-002

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