DHCP requirements
DevOps Code ClearCase® is compatible with most DHCP configurations, although it has a few special requirements that you must be aware of.
The Dynamic Host Configuration Protocol (DHCP) is an Internet standard protocol that allows a host to obtain a temporary, dynamically assigned IP address from a DHCP server. DHCP is widely implemented on Windows® computers, and also on some computers running Linux or the UNIX system.
DevOps Code ClearCase hosts
cache the IP addresses of other DevOps Code ClearCase hosts
(usually servers) that they access. If a cached address becomes incorrect
because the remote host has been assigned a new IP address by DHCP, DevOps Code ClearCase applications
that rely on the cached address may fail. Because DevOps Code ClearCase server
hosts are usually running and connected to the network, they are likely to
keep the IP addresses that their clients have cached, which makes these sorts
of failures unlikely. If DHCP is in use at your site, the following guidelines
should be observed to further minimize the chance of such failures:
- If possible, assign fixed IP addresses to DevOps Code ClearCase server hosts.
- Set the DHCP lease time (the length of time for which a host can use a DHCP-assigned address) to be at least twice as long as any DevOps Code ClearCase host is likely to be down or off the network. The DHCP lease time is typically established by the DHCP server.
- Do not configure DevOps Code ClearCase hosts to obtain a new DHCP address when they restart.