DHCPD: Not sure if the client is on correct network

googleboy · ‎04-18-2018

Hi Everybody,

I turned the debug ip dhcp server packets on the my INE R10 home lab router and I am receiving the output pasted at the end of this message. The server is configured with the correct client-identification string as follows:

ip dhcp pool HOST
host 155.1.79.9 255.255.255.0
client-identifier 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739
client-name R9

The server is sending DHCPOFFER and is receiving the DHCPREQUEST from the client but is not sending ACK. What could be the problem? What is the reason that the server is saying "Not sure if the client is on correct network"

Thank you for any help

************************** Debug Output Below ****************************

R10#
*Apr 18 11:37:49.314: DHCPD: Reload workspace interface GigabitEthernet1.108 tableid 0.
*Apr 18 11:37:49.314: DHCPD: tableid for 155.1.108.10 on GigabitEthernet1.108 is 0
*Apr 18 11:37:49.314: DHCPD: client's VPN is .
*Apr 18 11:37:49.314: DHCPD: using received relay info.
*Apr 18 11:37:49.314: DHCPD: DHCPDISCOVER received from client 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739 thr.
*Apr 18 11:37:49.314: DHCPD: using received relay info.
*Apr 18 11:37:
R10#49.314: DHCPD: Sending DHCPOFFER to client 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739 (155.1.79.9).DHCPD:s

*Apr 18 11:37:49.314: DHCPD: unicasting BOOTREPLY for client 000c.2974.c404 to relay 155.1.79.7.
*Apr 18 11:37:49.988: DHCPD: Reload workspace interface GigabitEthernet1.108 tableid 0.
*Apr 18 11:37:49.988: DHCPD: tableid for 155.1.108.10 on GigabitEthernet1.108 is 0
*Apr 18 11:37:49.988: DHCPD: client's VPN is .
*Apr 18 11:37:49.988:
R10#DHCPD: DHCPREQUEST received from client 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739.
*Apr 18 11:37:49.988: DHCPD: DHCPREQUEST received on interface GigabitEthernet1.108.
*Apr 18 11:37:49.988: DHCPD: Not sure if the client is on correct network
R10#
*Apr 18 11:37:52.989: DHCPD: Reload workspace interface GigabitEthernet1.108 tableid 0.
*Apr 18 11:37:52.989: DHCPD: tableid for 155.1.108.10 on GigabitEthernet1.108 is 0
*Apr 18 11:37:52.989: DHCPD: client's VPN is .
*Apr 18 11:37:52.989: DHCPD: DHCPREQUEST received from client 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739.
*Apr 18 11:37:52.989: DHCPD: DHCPREQUEST received on interface GigabitEthernet1.108.
*Apr 18 11:37:52.989: DHCPD: Not sure if the client is on correct ne
R10#twork
R10#
*Apr 18 11:37:55.989: DHCPD: Reload workspace interface GigabitEthernet1.108 tableid 0.
*Apr 18 11:37:55.989: DHCPD: tableid for 155.1.108.10 on GigabitEthernet1.108 is 0
*Apr 18 11:37:55.989: DHCPD: client's VPN is .
*Apr 18 11:37:55.989: DHCPD: DHCPREQUEST received from client 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739.
*Apr 18 11:37:55.989: DHCPD: DHCPREQUEST received on interface GigabitEthernet1.108.
*Apr 18 11:37:55.989: DHCPD: Not sure if the client is on correct ne
R10#twork
R10#
*Apr 18 11:37:58.989: DHCPD: Reload workspace interface GigabitEthernet1.108 tableid 0.
*Apr 18 11:37:58.989: DHCPD: tableid for 155.1.108.10 on GigabitEthernet1.108 is 0
*Apr 18 11:37:58.989: DHCPD: client's VPN is .
*Apr 18 11:37:58.989: DHCPD: DHCPREQUEST received from client 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739.
*Apr 18 11:37:58.989: DHCPD: DHCPREQUEST received on interface GigabitEthernet1.108.
*Apr 18 11:37:58.989: DHCPD: Not sure if the client is on correct network
R10#

Deepak Kumar · ‎04-18-2018

Hi,

What is default gateway assigned to POOL and what is VLAN IP?

Regards,

Deepak Kumar

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution if this comment will help you!

googleboy · ‎04-18-2018

@Deepak Kumar wrote:

Hi,

What is default gateway assigned to POOL and what is VLAN IP?

Regards,

Deepak Kumar

I just added a default-router to the pool on the server but that did not change anything. There is no switch between the client and the relay agent.

R10 Config (server):

===============

ip dhcp pool HOST
host 155.1.79.9 255.255.255.0
client-identifier 0063.6973.636f.2d30.3030.632e.3239.3734.2e63.3430.342d.4769.312e.3739
client-name R9
default-router 155.1.79.7

!

interface GigabitEthernet1.108
encapsulation dot1Q 108
ip address 155.1.108.10 255.255.255.0
ipv6 address 2001:155:1:108::10/64
end

DHCP Relay Config (R7)

====================

R7#show run | inc dhcp
ip dhcp relay information option
R7#
R7#show run interface gig 1.79
Building configuration...

Current configuration : 164 bytes
!
interface GigabitEthernet1.79
encapsulation dot1Q 79
ip address 155.1.79.7 255.255.255.0
ip helper-address 155.1.108.10
ipv6 address 2001:155:1:79::7/64
end

Client Config (R9)

===============

interface GigabitEthernet1.79
encapsulation dot1Q 79
ip address dhcp
ipv6 address 2001:155:1:79::9/64
end