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Conflict IP addresses in the pool

Created: Feb 24, 2020 08:38:13Latest reply: Feb 24, 2020 08:52:09 188 1 0 0 0
  Rewarded HiCoins: 0 (problem resolved)

Hello all,

I find there are a lot of conflict IP addresses in the address pool. How does this happen and what is its impact?

Thanks.

<Huawei>display ip pool interface vlanif100 all

Pool-name       : vlanif100

Pool-No           : 8

Lease               : 1 Days 0 Hours 0 Minutes

Domain-name : -

DNS-server0    : 114.114.114.114

DNS-server1    : 8.8.8.8

NBNS-server0  : -               

Netbios-type   : -               

Position           : Interface       

Status              : Unlocked

Gateway-0       : 10.0.0.1       

Mask                : 255.255.252.0

VPN instance: --

-----------------------------------------------------------------------------

Start           End     Total  Used  Idle(Expired)  Conflict  Disable

-----------------------------------------------------------------------------

10.0.0.1     10.0.3.254  1021   396      481(299)       142        2

-----------------------------------------------------------------------------


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Featured Answers
Popeye_Wang
Admin Created Feb 24, 2020 08:52:09

Hello Sprout,

When the address pool detects a conflicting IP, it will allocate other free IP addresses to avoid IP conflicts in the network. It is a protection against network IP conflicts and generally does not require attention.

There are usually two possible reasons:

1. The user manually configured a static IP address. However, the DHCP server does not exclude the IP address from the address pool, causing a conflict.

Locating method: Ping the conflicting IP from the DHCP server. If the IP address can be pinged, search for the ARP entry of the IP address and the corresponding MAC address to check whether a static IP address is configured for the MAC address.  

Solution: Run the excluded-ip-address command to exclude the IP address from the address pool. 

2. The address pool information has been cleared. For example, after the device is powered off and restarted, the address pool is reset, or the address pool is deleted, the address pool information is cleared. 

Locating method: View device logs, search for keywords such as reset and ip pool, and check whether the address pool is cleared or deleted. 

Solution: If the device needs to be restarted, run the dhcp server database enable command to save the address pool information to the hard disk, and run the dhcp server database recover command to restore the address pool information when the device is restarted. If the IP address pool is reset or deleted, the IP address is automatically released after the lease expires. 

Any further questions, let us know!

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All Answers
Popeye_Wang
Popeye_Wang Admin Created Feb 24, 2020 08:52:09

Hello Sprout,

When the address pool detects a conflicting IP, it will allocate other free IP addresses to avoid IP conflicts in the network. It is a protection against network IP conflicts and generally does not require attention.

There are usually two possible reasons:

1. The user manually configured a static IP address. However, the DHCP server does not exclude the IP address from the address pool, causing a conflict.

Locating method: Ping the conflicting IP from the DHCP server. If the IP address can be pinged, search for the ARP entry of the IP address and the corresponding MAC address to check whether a static IP address is configured for the MAC address.  

Solution: Run the excluded-ip-address command to exclude the IP address from the address pool. 

2. The address pool information has been cleared. For example, after the device is powered off and restarted, the address pool is reset, or the address pool is deleted, the address pool information is cleared. 

Locating method: View device logs, search for keywords such as reset and ip pool, and check whether the address pool is cleared or deleted. 

Solution: If the device needs to be restarted, run the dhcp server database enable command to save the address pool information to the hard disk, and run the dhcp server database recover command to restore the address pool information when the device is restarted. If the IP address pool is reset or deleted, the IP address is automatically released after the lease expires. 

Any further questions, let us know!

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