Rational ClearCase hosts
cache the IP addresses of other
Rational 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,
Rational ClearCase applications
that rely on the cached address may fail. Because
Rational 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 Rational 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 Rational 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 Rational ClearCase hosts
to obtain a new DHCP address when they restart.