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09-14-2018 08:35 AM - edited 09-14-2018 08:36 AM
09-14-2018 08:35 AM - edited 09-14-2018 08:36 AM
I am setting up a DHCP server running on one of MSR3012 interfaces:
>display interface GigabitEthernet 0/1 brief ... Interface Link Protocol Primary IP Description GE0/1 UP UP 192.168.202.1 Workstations >display dhcp server pool ... Network: 192.168.202.0 mask 255.255.255.0 address range 192.168.202.100 to 192.168.202.200 expired 1 0 0 0 gateway-list 192.168.202.1
I don't see any problem here, but when an actual DHCP request comes in the router marks all of the IPs in the pool as conflicting:
*Sep 14 23:16:09:005 2018 Main router DHCPS/7/PACKET: From 0.0.0.0 port 68, interface GigabitEthernet0/1 Message type: REQUEST (1) Hardware type: 1, Hardware address length: 6 Hops: 0, Transaction ID: 1891928330 Seconds: 0, Broadcast flag: 0 Client IP address: 0.0.0.0 Your IP address: 0.0.0.0 Server IP address: 0.0.0.0 Relay agent IP address: 0.0.0.0 Client hardware address: <stripped> Server host name: not configured Boot file name: not configured DHCP message type: DHCPDISCOVER (1) *Sep 14 23:16:09:005 2018 Main router DHCPS/7/EVENT: Receive a DHCPDISCOVER message from GigabitEthernet0/1. *Sep 14 23:16:09:005 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.100. *Sep 14 23:16:09:005 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.101. *Sep 14 23:16:09:005 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.102. *Sep 14 23:16:09:005 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.103. *Sep 14 23:16:09:006 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.104. *Sep 14 23:16:09:006 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.105. *Sep 14 23:16:09:006 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.106. ... *Sep 14 23:16:09:006 2018 Main router DHCPS/7/EVENT: Add a conflict IP 192.168.202.200.
After this DHCP server is not able to offer a lease to any clients. Any ideas why this could happen:?
Solved! Go to Solution.
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09-15-2018 05:38 AM
09-15-2018 05:38 AM
Re: Complete IP pool is marked as conflicting on DHCP request
Few more notes. I use the latest firmware, I can see all IPs as free in the pool before DHCP request arrives, the client is a single Ubuntu laptop connected directly to the router, it works fine with a static IP from the same subnet outside of the pool or with other DHCP servers. The problem is reproducible: if I reset IP conflicts all IPs become available and then are marked as conflicting simultaneously as soon as another DHCP request arrives.
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09-15-2018 01:05 PM
09-15-2018 01:05 PM
Re: Complete IP pool is marked as conflicting on DHCP request
Hi,
Could you please share the current configuration of the MSR Router, specially all DHCP configuration?
Thank You!
I am an HPE Employee
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09-16-2018 09:50 AM
09-16-2018 09:50 AM
Re: Complete IP pool is marked as conflicting on DHCP request
Thank you for looking into it! I will post all the configuration ASAP. In the meantime, is there any particular command that can display complete DHCP configuration or I need to output all of it separately (IP pools, interfraces, DHCP server status, etc)?
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09-16-2018 10:03 PM
09-16-2018 10:03 PM
Re: Complete IP pool is marked as conflicting on DHCP request
Hi,
Try this
display current-configuration | include dhcp
or
display current-configuration begin dhcp
if it will not work then share full.
Thank You!
I am an HPE Employee
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09-17-2018 05:29 AM
09-17-2018 05:29 AM
SolutionAnd thank you again!
I found out what the problem was: misconfigured static NAT had IP pool that was overlapping with DHCP pool. The problem manifested in a rather strange way, but apparently DHCP assigned IP was indeed conflicting with IPs that router was supposed to use for NAT.
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