Troubleshooting DHCP

 

Follow these guidelines when troubleshooting DHCP problems.

If your problem is not listed here, review the Planning for DHCP topic to verify that you have taken everything into consideration for your DHCP configuration.

Select a problem description from the following list, or read Gathering detailed DHCP error information topic for directions to access server log data and trace information.

• Gathering detailed DHCP error information
  There are a couple of ways to find out the error details behind the problem that you are encountering.

• Problem: Clients are not receiving an IP address or their configuration information
  Problems might occur if the clients cannot receive an IP address or the configuration information. An IP address is leased to a client through a four-step process between the client and the Dynamic Host Configuration Protocol (DHCP) server.

• Problem: Duplicate IP address assignments on the same network
  An IP address should be unique across your network. The Dynamic Host Configuration Protocol (DHCP) server cannot assign a single IP address to more than one client.

• Problem: DNS records are not being updated by DHCP
  The System i™ DHCP server is capable of dynamically updating DNS resource records. Dynamic update errors might be caused by the failure of updating DNS records update.

• Problem: DHCP job log has DNS030B messages with error code 3447
  Error code 3447 means that the Dynamic Host Configuration Protocol (DHCP) server timed out waiting for a response from the Domain Name System (DNS) server. This might be due to network or connection problems between the System i DHCP server and the DNS server.

 

Parent topic:

Dynamic Host Configuration Protocol

Related concepts
Solve communication problems using communications trace