Hitachi GR2000 Series - Manual (Page 206)

Hitachi Gigabit Router GR2000 Series Enhanced Version Operations - Device Management Overview
7-40 GR2K-GA-0015
Ver. 07-02
Step 1. Check in the configuration defining information that the specification of the
range of IP addresses to be allocated to DHCP clients (range parameter)
corresponds to the number of clients to be used simultaneously.
Step 2. If an IP addresses cannot be distributed to the PC to which the fixed IP
address is allocated, check that the fixed IP address specified by the
configuration definition command (CLI type 1)
dhcp host (fixed-address
parameter) is not contained in the IP address range specification of the
configuration defining information to be allocated dynamically. The
addresses may be in competition.
In the example described below, the addresses to be allocated dynamically
are defined from 192.168.10.100 to 192.168.10.120, while the address to
be allocated fixedly is 192.168.10.110. If the address 192.168.10.110 is
used first as a dynamically allocated address, the host to which the address
has been allocated fixedly will be unable to receive its address,
192.168.10.110.
< Example of competition of the fixedly allocated address and the
dynamically allocated address>.
dhcp subnet 192.168.10.0/24 range 192.168.10.100 192.168.10.120
dhcp host manager hardware 00:11:11:ef:ff:11 fixed-address 192.168.10.110
Step 3. If there is no communication between a client and another device after the
client has been allocated with an address from this device, it may be
because the default router has not been set. Check by using the dhep
option routers that the router address (default router) of the network with
which the client is connected is set (see GR2000 Configuration Commands,
Vol. 1).
Step 4. Confirm the setting of the device that will become a DHCP relay agent. If the
relay agent also uses this device, refer to Section 7.5.2.1, “Troubleshooting
DHCP/BOOTP Relay Communication Failures” on page 7-32.
Step 5. It is also possible that the DHCP server demon will not be actuated
smoothly. When setting the configuration defining information related to
the DHCP server, the system must be rebooted. For instructions on
actuating thereof, (see GR2000 Configuration Commands, Vol. 1).
(b) Inspection of Log Message and Interface
One of the causes for disability of assigning an IP address to the client is assumed
that communication has become unavailable between the client and the server.
Inspect the log messages shown in the router by the
show ip interface command and
the interface up/down status by the interface command. Since these procedures are
the same as for the troubleshooting on IP communication failures, follow the
procedures in Subsection 7.5.1, “Communication cannot be done or communication
is disconnected” on page 7-23.
(c) Determination of Failure Range (Echo Test from Own Router)
When no failure is found in the own router, a failure may exist somewhere in the
route between this router and the destination. To determine the failure range from
the own router, follow the procedure below.
Step 1. Log in to the own router.
Step 2. If there is a router between a client and a server, use the ping command to
confirm the rapport between the device present (router) and its counterpart
(DHCP client) that cannot be contacted. If the
ping command cannot
confirm the rapport with the communication counterpart, confirm the
rapport toward this device’s closest sequential client side communication