Common Operational Problems - Novell NETWARE 6-DOCUMENTATION Manual

Common Operational Problems

136 Novell DNS/DHCP Management Utility Administration Guide
If DHCP hosts cannot obtain a DHCP lease when required, verify that
enough leases exist to accommodate all hosts that use DHCP. If there are
too few leases, obtain more IP addresses and configure more leases or
reduce the lease time to a few hours. This ensures that more leases are
made available to other clients that are waiting to use the IP addresses.
If a Windows 95 client cannot acquire a lease and responds with the
messageUnable to obtain an IP network address the
client requires a longer timeout. This problem might occur when the
client and DHCP server are separated by one or more routers. To increase
the timeout for Windows 95 clients, obtain a patch from Microsoft. The
patch is dated 2/12/96 and includes a file named VDHCP.386. The patch
itself is named DCHCPUPD.EXE.
3. Verify that the number of leases available for clients does not decrease
when you are using mobile clients.
If the number of leases available for clients decreases when you are using
mobile clients, verify that the mobile clients' lease is released when the
client connects from a remote office or that the mobile client can use the
same lease and the same IP address at the new location.
If the remote office is on a subnet different from that of the local
office and the subnet is serviced by a different DHCP server, verify
that the lease is released by the first server within a reasonable
amount of time after the mobile client moves to the remote office. If
the lease is not released quickly enough, reduce the lease time.
If the remote office is on a subnet different from that of the local
office and the subnet is serviced by the same DHCP server, verify
that the IPAssignmentPolicy attribute of the DHCP server object in
eDirectory is set to DELETE_DUPLICATE. This ensures that only
one lease is in use at a time because the original lease is deleted when
the mobile client requests a new lease.
If the remote office is on the same subnet as that of the local office,
the mobile client should use the same IP address. If the mobile client
does not use the same IP address, verify that there is only one DHCP
server for the subnet.
The following list describes the most common operational errors that occur.
Problem—A node is intermittently inoperable.