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Duplicate windows vmware client12/28/2023 ![]() Upon receiving the first request, the DHCP server sends an ACK that includes an MCLT lease duration value before it tries to synchronize with its partner. This is because a DHCP server may issue either a Maximum Client Lead Time (MCLT) or Scope lease duration value, depending on the following circumstances: A DAI-enabled switch will then block the ports.Ī DHCP failover on a Windows Server 2012 server can't guarantee consistent lease duration for duplicated DHCP requests. As soon as the DHCP lease duration expires, the traffic information is removed from the device database. If the active router doesn't respond, the standby router takes over the shared IP address.ĭHCP snooping enables a switch device to inspect DHCP traffic and to track which IP addresses are assigned to which host switch ports. A heartbeat is exchanged between the routers. In a typical VRRP configuration that uses one IP address, one router is designated as the "active" device and the other one is set to "standby" mode. This configuration is common when Virtual Router Redundancy Protocol (VRRP) is used. To provide redundancy, some organizations prefer to configure dual relays (two routers that each point to two DHCP servers). If DAI can't be configured to honor the first lease duration value, turn off or remove the DAI feature that is causing the conflict.ĭon't use DHCP failover in combination with two relay agents and DAI on the switches. To do this, use virtual router groups if your router redundancy protocol is HSRP.Ĭonfigure DAI so that it honors the first DHCP lease duration value (whenever possible). Operate the DHCP relay agents in an active-passive mode.To do this, use one of the following options: To work around this problem, use one of the following methods: This creates a lease mismatch and causes DAI to block clients from accessing the network. This leads to a race condition in which the clients accept the first value that is received and ignore the second. For both DHCP requests, the DHCP failover-enabled server sends to the clients different ACK messages that have different lease duration values. This problem occurs because the duplicated DHCP relay agents cause the DHCP server to always receive duplicate DHCP messages for each client that connects to the network. In this scenario, DHCP clients are blocked and experience other network issues. DHCP snooping and Dynamic ARP Inspection (DAI) are enabled on network devices, such as switches.In this environment, you deploy a pair of active-active (duplicate) DHCP relay agents.You deploy a Dynamic Host Configuration Protocol (DHCP) failover by using a server that is running Windows Server 2012 R2.This article provides a workaround for an issue where DHCP clients are blocked when a DAI-enabled network device is used together with a DHCP failover on a Windows Server 2012 server.Īpplies to: Windows Server 2012 R2 Original KB number: 2978225 Symptoms
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