IP version 4 lease process – troubleshooting

A DHCP client will not always obtain an IP address because maybe it cannot connect to the DHCP server. An unlikely reason is that the address pool is exhausted; in that case, the local machine will allocate an Automated Private IP Address (APIPA) starting with 169.254.x.x. This is an excellent aid to troubleshooting, as it lets the network engineer know that the client cannot contact the DHCP server. There are many reasons that this happens, so let's look at the DHCP process:

Figure 24: DHCP process across subnets

If the DHCP client is on another subnet, it can cause some problems:

  • RFC-1542-compliant ...

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