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Unable to lease DHCP addr to remote VPN clients

keerthi vardhan
Level 1
Level 1

Hi All,

Im facing with some DHCP lease issue and its like this,

Our Cisco 2951 edge router is configured with local dhcp pool for a set of remote users when they connect through Cisco VPN which was working fine until we planned to change it to a Windows box that is configured for DHCP.

The basic idea now is to relay the DHCP requests that are coming from the remote clients through Cisco VPN to the DHCP Windows server. So we added the scope on the server and changed the client config on the router as follows (highlighted is the dhcp relay config).

crypto isakmp client configuration group GROUPNAME

key xxxxx

dns 10.13.3.10 10.13.3.13

wins 10.13.3.10

domain abc.com

acl Testacl

dhcp server 10.13.3.10

dhcp giaddr 10.13.6.99

netmask 255.255.255.0

When we try to debug the process it shows that it is hitting the DHCP server (10.13.3.10) with the request but there is no response from the server.

Feb 12 13:24:24.345: DHCP: SDiscover attempt # 1 for entry:
Feb 12 13:24:24.345: DHCP: SDiscover: sending 311 byte length DHCP packet
Feb 12 13:24:24.345: DHCP: SDiscover with directed serv 10.13.3.10, 311 bytes
Feb 12 13:24:24.345: Unicast to 10.13.3.10 from 10.13.6.99
Feb 12 13:24:28.041: DHCP: SDiscover attempt # 2 for entry:
Feb 12 13:24:28.041: DHCP: SDiscover: sending 311 byte length DHCP packet
Feb 12 13:24:28.041: DHCP: SDiscover with directed serv 10.13.3.10, 311 bytes
Feb 12 13:24:28.041: Unicast to 10.13.3.10 from 10.13.6.99
Feb 12 13:24:59.072: DHCP: deleting entry 13F1B208 0.0.0.0 from list
Feb 12 13:24:59.072: DHCP: Client socket is closed

If anyone has faced this situation or able to relate to the problem then any advice would be greatly appreciated.

Thanks in advance mates..

3 Replies 3

Jeff Van Houten
Level 5
Level 5

I'm just curious. What is the reason for moving the pool off the router and onto a windows box?

Sent from Cisco Technical Support iPad App

paolo bevilacqua
Hall of Fame
Hall of Fame

DHCP relay is not a good idea.

No network, no address, no work.

Use IP helper Address Command on Inside Interface.

Jawad