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Setup TFTP option on Cisco DHCP service

How to add the TFTP option on Cisco DHCP service ?

ip dhcp excluded-address 192.168.1.0 192.168.1.99
!
ip dhcp pool UPC-dhcp
   network 192.168.1.0 255.255.255.0
   dns-server 192.168.150.32 192.168.150.37
   default-router 192.168.1.2

Thanks
0
AXISHK
Asked:
AXISHK
3 Solutions
 
AXISHKAuthor Commented:
To clarify further, when my network client recieve the DHCP information from Cisco router, they will also get the TFTP information pointing to another server in our netowrk.  Can we configure this ?

Thanks
0
 
vikrantambhoreCommented:
Hi AXISHK,

Yes you can configure TFTP address  in DHCP Configuration, try  below configuration:
XX.XX.XX.XX is your TFTP Server IP Address
!
ip dhcp excluded-address 192.168.1.0 192.168.1.99
!
ip dhcp pool UPC-dhcp
   network 192.168.1.0 255.255.255.0
   dns-server 192.168.150.32 192.168.150.37
   default-router 192.168.1.2
   option 150 ip  XX.XX.XX.XX


HTH
Vikrant
0
 
Istvan KalmarHead of IT Security Division Commented:
In same cases you need to use standard tftp option:

ip dhcp excluded-address 192.168.1.0 192.168.1.99
!
ip dhcp pool UPC-dhcp
   network 192.168.1.0 255.255.255.0
   dns-server 192.168.150.32 192.168.150.37
   default-router 192.168.1.2
   option 66 ip  XX.XX.XX.XX
0
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Istvan KalmarHead of IT Security Division Commented:
0
 
vivigattCommented:
Actually, you can use "next server" option (aka TFTP server option) instead of option 66 (which is a "recent" extension of the bootp/dhcp protocol and if used alone moght not work as expected):

http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rddhcp.html#wp1018588

In that case, the configuration becomes

ip dhcp excluded-address 192.168.1.0 192.168.1.99
!
ip dhcp pool UPC-dhcp
   network 192.168.1.0 255.255.255.0
   dns-server 192.168.150.32 192.168.150.37
   default-router 192.168.1.2
   next-server XX.XX.XX.XX

But a TFTP option might not be enough without a "boot file name option" (option 67, but already taken into account by Cisco):

http://www.cisco.com/en/US/docs/ios/12_1/iproute/command/reference/1rddhcp.html#wp1017389

Then, it becomes:

ip dhcp excluded-address 192.168.1.0 192.168.1.99
!
ip dhcp pool UPC-dhcp
   network 192.168.1.0 255.255.255.0
   dns-server 192.168.150.32 192.168.150.37
   default-router 192.168.1.2
   next-server XX.XX.XX.XX
   bootfile pxelinux.0


Now this is not very flexible : you can't configure what client gets which tftp-server/bootfile name.
If your clients are PXE clients, there are "PXE services" that are very useful. If you want some, details, just ask!

Hope this helps
0
 
AXISHKAuthor Commented:
tks
0
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