DHCP Explorer |
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DhcpExplorer 1.1 |
Description |
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File Size: 544 KB Last
update: 21/06/08 |
| DhcpExplorer tool allows you to
discover DHCP servers on your local subnet or LAN. This is useful for
locating servers that are not supposed to be on your network ( rogue
DHCP servers ) as well as checking the expected output of known servers.
DHCP Explorer broadcasts on the local physical subnet to find available
DHCP servers. The tool is designed with a user-friendly interface and is
easy to use |
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OS: Windows2000,WinXP,Windows2003 |
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System Requirements: DHCP enabled on network adapter |
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License: Freeware |
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Last Changes: Updated dhcp client |
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Pro version is available in
Nsauditor |
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Download |
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| Screenshot |
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Dynamic Host
Configuration Protocol
Dynamic Host Configuration Protocol (DHCP) is a
client-server networking protocol and uses the same two IANA assigned
ports for BOOTP: 67/udp for the server side, and 68/udp for the client
side. A DHCP server provides configuration parameters specific to the
DHCP client host requesting, generally, information required by the
client host to participate on an IP network. DHCP also provides a
mechanism for allocation of IP addresses to client hosts. DHCP server is
a useful tool that automates the assignment of IP addresses to hundreds
of workstations in your network. The server maintains a pool of IP
addresses that you use to create scopes. A DHCP scope is a collection of
IP addresses and TCP/IP configuration parameters that are available for
DHCP clients to lease. The server automatically allocates these IP
addresses and related TCP/IP configuration settings to DHCP-enabled
clients in the network. The DHCP service leases the IP addresses to
clients for a period that you specify when you create a scope. A lease
becomes inactive when it expires. Through the DHCP server, you can
reserve specific IP addresses permanently for hardware devices that must
have a static IP address (e.g., a DNS server). An advantage of using
DHCP is that the service assigns addresses dynamically. The service
returns addresses that are no longer in use to the IP address pool so
that the server can reallocate them to other machines in the network. If
not for this service, you would have to manually configure IP for new
computers, keep track of IP addresses so that you could reassign
addresses that clients aren't using, and reconfigure computers that you
move from one subnet to another
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| Client
Configuration Parameters |
| A DHCP server can provide optional configurations to the
client. RFC 2132 defines DHCP options. |
List of
configurable options and their corresponding numbers:
Data
Tag Name Length Meaning
--- ---- ------ -------
0 Pad 0 None
1 Subnet Mask 4 Subnet Mask Value
2 Time Offset 4 Time Offset in
Seconds from UTC
3 Router N N/4 Router addresses
4 Time Server N N/4 Timeserver addresses
5 Name Server N N/4 IEN-116 Server addresses
6 Domain Server N N/4 DNS Server addresses
7 Log Server N N/4 Logging Server addresses
8 Quotes Server N N/4 Quotes Server addresses
9 LPR Server N N/4 Printer Server addresses
10 Impress Server N N/4 Impress Server addresses
11 RLP Server N N/4 RLP Server addresses
12 Hostname N Hostname string
13 Boot File Size 2 Size of boot file in 512 byte
chunks
14 Merit Dump File N Client to dump and name
the file to dump it to
15 Domain Name N The DNS domain name of the
client
16 Swap Server N Swap Server addeess
17 Root Path N Path name for root disk
18 Extension File N Path name for more BOOTP info
19 Forward On/Off 1 Enable/Disable IP Forwarding
20 SrcRte On/Off 1 Enable/Disable Source Routing
21 Policy Filter N Routing Policy Filters
22 Max DG Assembly 2 Max Datagram Reassembly Size
23 Default IP TTL 1 Default IP Time to Live
24 MTU Timeout 4 Path MTU Aging Timeout
25 MTU Plateau N Path MTU Plateau Table
26 MTU Interface 2 Interface MTU Size
27 MTU Subnet 1 All Subnets are Local
28 Broadcast Address 4 Broadcast Address
29 Mask Discovery 1 Perform Mask Discovery
30 Mask Supplier 1 Provide Mask to Others
31 Router Discovery 1 Perform Router Discovery
32 Router Request 4 Router Solicitation Address
33 Static Route N Static Routing Table
34 Trailers 1 Trailer Encapsulation
35 ARP Timeout 4 ARP Cache Timeout
36 Ethernet 1 Ethernet Encapsulation
37 Default TCP TTL 1 Default TCP Time to Live
38 Keepalive Time 4 TCP Keepalive Interval
39 Keepalive Data 1 TCP Keepalive Garbage
40 NIS Domain N NIS Domain Name
41 NIS Servers N NIS Server Addresses
42 NTP Servers N NTP Server Addresses
43 Vendor Specific N Vendor Specific Information
44 NETBIOS Name Srv N NETBIOS Name Servers
45 NETBIOS Dist Srv N NETBIOS Datagram Distribution
46 NETBIOS Node Type 1 NETBIOS Node Type
47 NETBIOS Scope N NETBIOS Scope
48 X Window Font N X Window Font Server
49 X Window Manager N X Window Display Manager
50 Address Request 4 Requested IP Address
51 Address Time 4 IP Address Lease Time
52 Overload 1 Overload "sname" or "file"
53 DHCP Msg Type 1 DHCP Message Type
54 DHCP Server Id 4 DHCP Server Identification
55 Parameter List N Parameter Request List
56 DHCP Message N DHCP Error Message
57 DHCP Max Msg Size 2 DHCP Maximum Message Size
58 Renewal Time 4 DHCP Renewal (T1) Time
59 Rebinding Time 4 DHCP Rebinding (T2) Time
60 Class Id N Class Identifier
61 Client Id N Client Identifier
62 Netware/IP Domain N Netware/IP Domain Name
63 Netware/IP Option N Netware/IP sub Options
64 NIS-Domain-Name N NIS+ v3 Client Domain Name
65 NIS-Server-Addr N NIS+ v3 Server Addresses
66 Server-Name N TFTP Server Name
67 Bootfile-Name N Boot File Name
68 Home-Agent-Addrs N Home Agent Addresses
69 SMTP-Server N Simple Mail Server Addresses
70 POP3-Server N Post Office Server Addresses
71 NNTP-Server N Network News Server Addresses
72 WWW-Server N WWW Server Addresses
73 Finger-Server N Finger Server Addresses
74 IRC-Server N Chat Server Addresses
75 StreetTalk-Server N StreetTalk Server Addresses
76 STDA-Server N ST Directory Assist. Addresses
77 User-Class N User Class Information
78 Directory Agent N directory agent information
79 Service Scope N service location agent scope
80 Rapid Commit 0 Rapid Commit
81 Client FQDN N Fully Qualified Domain Name
82 Relay Agent Information N Relay Agent Information
83 iSNS N Internet Storage Name Service
84 REMOVED/Unassigned
85 NDS Servers N Novell Directory Services
86 NDS Tree Name N Novell Directory Services
87 NDS Context N Novell Directory Services
88 BCMCS Controller Domain Name list
89 BCMCS Controller IPv4 address option
90 Authentication N Authentication
91 REMOVED/Unassigned
92 REMOVED/Unassigned
93 Client System N Client System Architecture
94 Client NDI N Client Network Device Interface
95 LDAP N Lightweight Directory Access Protocol
96 REMOVED/Unassigned
97 UUID/GUID N UUID/GUID-based Client Identifier
98 User-Auth N Open Group's User Authentication
99 Unassigned
100 REMOVED/Unassigned
101 REMOVED/Unassigned
102-107 REMOVED/Unassigned
108 REMOVED/Unassigned
109 Unassigned
110 REMOVED/Unassigned
111 Unassigned
112 Netinfo Address N NetInfo Parent Server Address
113 Netinfo Tag N NetInfo Parent Server Tag
114 URL N URL
115 REMOVED/Unassigned
116 Auto-Config N DHCP Auto-Configuration
117 Name Service Search N Name Service Search
118 Subnet Selection Option 4 Subnet Selection Option
119 Domain Search N DNS domain serach list
120 SIP Servers DHCP Option N SIP Servers DHCP Option
121 Classless Static Route N Classless Static Route Option
Option
122 CCC N CableLabs Client Configuration
123 GeoConf Option 16 GeoConf Option
124 V-I Vendor Class Vendor-Identifying Vendor Class
125 V-I Vendor-Specific Vendor-Identifying Vendor-Specific
Information Information
126 Removed/Unassigned
127 Removed/Unassigned
128 PXE - undefined (vendor specific) (Tentatively Assigned - June 23,
128 Etherboot signature. 6 bytes: E4:45:74:68:00:00
128 DOCSIS "full security" server IP address
128 TFTP Server IP address (for IP Phone software load)
129 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
129 Kernel options. Variable length string
129 Call Server IP address
130 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
130 Ethernet interface. Variable length string.
130 Discrimination string (to identify vendor)
131 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
131 Remote statistics server IP address
132 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
132 802.1P VLAN ID
133 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
133 802.1Q L2 Priority
134 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
134 Diffserv Code Point
135 PXE - undefined (vendor specific) (Tentatively Assigned - 23 Jun 20
135 HTTP Proxy for phone-specific applications
136-149 Unassigned
150 TFTP server address (Tentatively Assigned - 23 Jun 2005)
150 Etherboot
150 GRUB configuration path name
151-174 Unassigned
175 Etherboot (Tentatively Assigned - 23 Jun 2005)
176 IP Telephone (Tentatively Assigned - 23 Jun 2005)
177 Etherboot (Tentatively Assigned - 23 Jun 2005)
177 PacketCable and CableHome (replaced by 122)
178-207 Unassigned
208 pxelinux.magic (string) = F1:00:74:7E (241.0.116.126) (Tentatively
Assigned - 23 Jun 2005)
209 pxelinux.configfile (text) (Tentatively Assigned - 23 Jun 2005)
210 pxelinux.pathprefix (text) (Tentatively Assigned - 23 Jun 2005)
211 pxelinux.reboottime (unsigned integer 32 bits) (Tentatively Assigned
- 23 Jun 2005)
212-219 Unassigned
220 Subnet Allocation Option (Tentatively Assigned - 23 Jun 2005)
221 Virtual Subnet Selection Option (Tentatively Assigned - 23 Jun 2005
222-223 Unassigned
224-254 Private Use
255 End 0 None
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"Very broad collection of network audit
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25 August 2005
SC Magazine
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