After enabling Windows Server 2012 R2 DHCP Failover Getting Packet dropped because of Client ID hash mismatch

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we have 2 dhcp servers @ our site (they each located on different subnets).  these dhcp servers running windows server 2012 r2.  dedicated dhcp servers.  yesterday afternoon, reconfigured several scopes such become members of single dhcp failover relationship have configured load balance 50% of load placed on each dhcp failover relationship member (dhcp server).

however, morning, users reported unable renew dhcp addresses.  looking dhcp logs on both dhcp servers, there several entries follow:

"36,mm/dd/yyyy,hh:mm:ss,packet dropped because of client id hash mismatch or standby server.,ip subnet,,mac address,,0,6,,,,,,,,,0"

i performed manual synchronization of failover relationship , scopes on both dhcp servers.  restarted dhcp service on both dhcp servers still getting same error.

a bing/google search did not bring light issue encountering.  has encountered , if so, solution.

i should add when attempted perform ipconfig/renew on workstation, failed , error listed above showed in dhcp log of 1 of our dhcp servers not other.  however, once performed ipconfig /release , ipconfig /renew, able renew lease.

should add dhcp server event logs on both dhcp servers clean, there no warnings and/or errors reported.

well, according article (https://technet.microsoft.com/en-us/library/dn338988.aspx?f=255&mspperror=-2147217396), can safely ignored. dhcp-failover informational event commonly recorded in dhcp audit log event id 36: 36,<date>,<time>,packet dropped because of client id hash mismatch or standby server… event informational , can safely ignored. not indicate error. in dhcp failover, client messages broadcast received both dhcp failover servers. however, 1 server responds client messages. in case of load balance mode, servers hash mac address of dhcp client establish of them must respond. in hot standby mode, active server responds. in both cases, dhcp server not respond client logs message in audit log. </time></date>


Windows Server  >  IPAM, DHCP, DNS



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