If there is a problem, the debug output might display warnings or error
messages. Use Table 11-4 to find error messages
and solutions.
Table 11-4 DHCP Server Error Messages
Message | Explanation | Solution |
|---|
ICMP ECHO reply to OFFER candidate: ip_address
disabling | Before the DHCP server offers an IP address to a client,
it pings the address to verify that the address is not in use. If a client
replies, the address is in use. | Make sure the addresses you configured are
not already in use. |
No more IP addresses on network_address network. | No available IP addresses in the DHCP network table associated
with the client's network. | Create more IP addresses using DHCP Manager
or pntadm. If the DHCP daemon is monitoring multiple subnets,
be sure the additional addresses are for the subnet where the client is located. |
No more IP addresses for network_address network when you are running the DHCP daemon in BOOTP compatibility mode
(-b option). | BOOTP does not use a lease time, so the DHCP
server looks for free addresses with the BOOTP flag set to allocate to BOOTP
clients. | Use DHCP Manager to allocate BOOTP addresses. |
Request to access nonexistent per network database: database_name in datastore: datastore. | During
configuration of the DHCP server, a DHCP network table for a subnet was not
created. | Use DHCP Manager or the pntadm to create
the DHCP network table and new IP addresses. |
There is no table_name dhcp-network table for DHCP client's network. | During configuration of the DHCP
server, a DHCP network table for a subnet was not created. | Use DHCP Manager or the pntadm to create the DHCP network table and new IP addresses. |
Client using non_RFC1048 BOOTP cookie. | A device on the network is trying
to access an unsupported implementation of BOOTP. | Ignore this message, unless you
need to configure this device. |
DHCP snoop Output
In the snoop output, you should see that packets
are exchanged between the DHCP client system and the DHCP server system. The
IP address for each system (and any relay agents or routers in between) is
indicated in each packet. If the systems do not exchange packets, the client
system might not be able to contact the server system at all, and the problem
is at a lower level.
To evaluate snoop output, you should know what the
expected behavior is (such as if the request should be going through a BOOTP
relay agent). You should also know the MAC addresses and IP address of the
systems involved (and those of the network interfaces, if there is more than
one) so that you can determine if those values are as expected. The following
example shows normal snoop output for a DHCP acknowledgement
message sent from the DHCP server on blue-servr2 to a client
whose MAC address is 8:0:20:8e:f3:7e. In the message, the
servers assigns the client the IP address 172.168.252.6
and the host name white-6. The message also includes a
number of standard network options and several vendor-specific options for
the client.
Example 11-5 Sample snoop Output for One Packet
ETHER: ----- Ether Header -----
ETHER:
ETHER: Packet 26 arrived at 14:43:19.14
ETHER: Packet size = 540 bytes
ETHER: Destination = 8:0:20:8e:f3:7e, Sun
ETHER: Source = 8:0:20:1e:31:c1, Sun
ETHER: Ethertype = 0800 (IP)
ETHER:
IP: ----- IP Header -----
IP:
IP: Version = 4
IP: Header length = 20 bytes
IP: Type of service = 0x00
IP: xxx. .... = 0 (precedence)
IP: ...0 .... = normal delay
IP: .... 0... = normal throughput
IP: .... .0.. = normal reliability
IP: Total length = 526 bytes
IP: Identification = 64667
IP: Flags = 0x4 IP: .1.. .... = do not fragment
IP: ..0. .... = last fragment
IP: Fragment offset = 0 bytes
IP: Time to live = 254 seconds/hops
IP: Protocol = 17 (UDP)
IP: Header checksum = 157a
IP: Source address = 10.21.0.4, blue-servr2
IP: Destination address = 192.168.252.6, white-6
IP: No options
IP: UDP: ----- UDP Header -----
UDP:
UDP: Source port = 67
UDP: Destination port = 68 (BOOTPC)
UDP: Length = 506
UDP: Checksum = 5D4C
UDP:
DHCP: ----- Dynamic Host Configuration Protocol -----
DHCP:
DHCP: Hardware address type (htype) = 1 (Ethernet (10Mb))
DHCP: Hardware address length (hlen) = 6 octets
DHCP: Relay agent hops = 0
DHCP: Transaction ID = 0x2e210f17
DHCP: Time since boot = 0 seconds
DHCP: Flags = 0x0000
DHCP: Client address (ciaddr) = 0.0.0.0
DHCP: Your client address (yiaddr) = 192.168.252.6
DHCP: Next server address (siaddr) = 10.21.0.2
DHCP: Relay agent address (giaddr) = 0.0.0.0
DHCP: Client hardware address (chaddr) = 08:00:20:11:E0:1B
DHCP:
DHCP: ----- (Options) field options -----
DHCP:
DHCP: Message type = DHCPACK
DHCP: DHCP Server Identifier = 10.21.0.4
DHCP: Subnet Mask = 255.255.255.0
DHCP: Router at = 192.168.252.1
DHCP: Broadcast Address = 192.168.252.255
DHCP: NISPLUS Domainname = dhcp.test
DHCP: IP Address Lease Time = 3600 seconds
DHCP: UTC Time Offset = -14400 seconds
DHCP: RFC868 Time Servers at = 10.21.0.4
DHCP: DNS Domain Name = sem.example.com
DHCP: DNS Servers at = 10.21.0.1
DHCP: Client Hostname = white-6
DHCP: Vendor-specific Options (166 total octets):
DHCP: (02) 04 octets 0x8194AE1B (unprintable)
DHCP: (03) 08 octets "pacific"
DHCP: (10) 04 octets 0x8194AE1B (unprintable)
DHCP: (11) 08 octets "pacific"
DHCP: (15) 05 octets "xterm"
DHCP: (04) 53 octets "/export/s2/base.s2s/latest/Solaris_8/Tools/Boot"
DHCP: (12) 32 octets "/export/s2/base.s2s/latest"
DHCP: (07) 27 octets "/platform/sun4m/kernel/unix"
DHCP: (08) 07 octets "EST5EDT"
0: 0800 208e f37e 0800 201e 31c1 0800 4500 .. .ó~.. .1...E.
16: 020e fc9b 4000 fe11 157a ac15 0004 c0a8 ....@....z......
32: fc06 0043 0044 01fa 5d4c 0201 0600 2e21 ...C.D..]L.....!
48: 0f17 0000 0000 0000 0000 c0a8 fc06 ac15 ................
64: 0002 0000 0000 0800 2011 e01b 0000 0000 ........ .......
80: 0000 0000 0000 0000 0000 0000 0000 0000 ................
96: 0000 0000 0000 0000 0000 0000 0000 0000 ................
112: 0000 0000 0000 0000 0000 0000 0000 0000 ................
128: 0000 0000 0000 0000 0000 0000 0000 0000 ................
144: 0000 0000 0000 0000 0000 0000 0000 0000 ................
160: 0000 0000 0000 0000 0000 0000 0000 0000 ................
176: 0000 0000 0000 0000 0000 0000 0000 0000 ................
192: 0000 0000 0000 0000 0000 0000 0000 0000 ................
208: 0000 0000 0000 0000 0000 0000 0000 0000 ................
224: 0000 0000 0000 0000 0000 0000 0000 0000 ................
240: 0000 0000 0000 0000 0000 0000 0000 0000 ................
256: 0000 0000 0000 0000 0000 0000 0000 0000 ................
272: 0000 0000 0000 6382 5363 3501 0536 04ac ......c.Sc5..6..
288: 1500 0401 04ff ffff 0003 04c0 a8fc 011c ................
304: 04c0 a8fc ff40 0964 6863 702e 7465 7374 .....@.dhcp.test
320: 3304 0000 0e10 0204 ffff c7c0 0404 ac15 3...............
336: 0004 0f10 736e 742e 6561 7374 2e73 756e ....sem.example.
352: 2e63 6f6d 0604 ac15 0001 0c07 7768 6974 com.........whit
368: 652d 362b a602 0481 94ae 1b03 0861 746c e-6+.........pac
384: 616e 7469 630a 0481 94ae 1b0b 0861 746c ific.........pac
400: 616e 7469 630f 0578 7465 726d 0435 2f65 ific...xterm.5/e
416: 7870 6f72 742f 7332 382f 6261 7365 2e73 xport/sx2/bcvf.s
432: 3238 735f 776f 732f 6c61 7465 7374 2f53 2xs_btf/latest/S
448: 6f6c 6172 6973 5f38 2f54 6f6f 6c73 2f42 olaris_x/Tools/B
464: 6f6f 740c 202f 6578 706f 7274 2f73 3238 oot. /export/s2x
480: 2f62 6173 652e 7332 3873 5f77 6f73 2f6c /bcvf.s2xs_btf/l
496: 6174 6573 7407 1b2f 706c 6174 666f 726d atest../platform
512: 2f73 756e 346d 2f6b 6572 6e65 6c2f 756e /sun4m/kernel/un
528: 6978 0807 4553 5435 4544 54ff ix..EST5EDT.
|
