DHCP find reservation by MAC


R

richard

Could anyone tell me how to to find a DHCP reservation if all I know
is the MAC address? There seems to be no way of searching or ordering
by MAC.

I've tried using netsh to dump the dhcp configuration to a text file
which I could then search. I can get the utility to dump to the
console, but when I try redirecting the output:

netsh dhcp server> dump > myTextFile.txt

I get an error message:
Parameter(s) passed are either incomplete or invalid.

Google shows other users with this same problem, but unresolved. Does
the utility actually work?

I'm using 2003 Server sp1

I'd appreciate any advice.

Richard
 
Ad

Advertisements

R

Richard G. Harper

If you're using the Windows Server 2003 DHCP Server, you should be able to
click the MAC address column of the current lease list and it will sort by
MAC address. Any of the columns in the DHCP Server plug-in are sortable.

--
Richard G. Harper [MVP Shell/User] (e-mail address removed)
* NEW! Catch my blog ... http://msmvps.com/blogs/rgharper/
* PLEASE post all messages and replies in the newsgroups
* The Website - http://rgharper.mvps.org/
* HELP us help YOU ... http://www.dts-l.org/goodpost.htm
 
R

richard

If you're using the Windows Server 2003 DHCP Server, you should be able to
click the MAC address column of the current lease list and it will sort by
MAC address. Any of the columns in the DHCP Server plug-in are sortable.


Thanks Richard,

I need to search the reservations, not the addresses that are
currently leased out.

The reservations pane only has a single column, and while you can
add/remove columns to the leases pane, there is no such operation
available for reservations.

Regards,

Richard
 
J

Jorge de Almeida Pinto [MVP - DS]

it worked for me...

also using W2K3 SP1

I tried:
---------------------
D:\TEMP>netsh dhcp server dump | find /i"000c2959c009"
Dhcp Server 10.1.1.1 Scope 10.1.0.0 Add reservedip 10.1.1.101 000c2959c009
"TEST1" "" "BOTH"
---------------------
netsh dhcp server dump > test.txt

contents of test.txt
^^^^^^^^^^^^


# ==============================================================
# Configuration Information for Server 10.1.1.1
# ==============================================================



# =====================================
# Add Classes
# =====================================

Dhcp Server 10.1.1.1 Add Class "Default Routing and Remote Access Class"
"User class for remote access clients" 525241532e4d6963726f736f6674 0 b
Dhcp Server 10.1.1.1 Add Class "Default BOOTP Class" "User class for BOOTP
Clients" 424f4f54502e4d6963726f736f6674 0 b
Dhcp Server 10.1.1.1 Add Class "Microsoft Windows 2000 Options" "Microsoft
vendor-specific options for Windows 2000 Clients" 4d53465420352e30 1 b
Dhcp Server 10.1.1.1 Add Class "Microsoft Windows 98 Options" "Microsoft
vendor-specific options for Windows 98 Clients" 4d534654203938 1 b
Dhcp Server 10.1.1.1 Add Class "Microsoft Options" "Microsoft
vendor-specific options applicable to Windows 98 and Windows 2000 Clients"
4d534654 1 b

# =====================================
# Add Classes End
# =====================================


# =====================================
# Add Optiondef
# =====================================


Dhcp Server 10.1.1.1 Add Optiondef 249 "Classless Static Routes" BINARY 0
comment="Destination, mask and router IP addresses in priority order"
Dhcp Server 10.1.1.1 Add Optiondef 1 "Subnet Mask" IPADDRESS 0
comment="Subnet mask in network byte order" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 2 "Time Offset" DWORD 0 comment="UCT
offset in seconds" 0
Dhcp Server 10.1.1.1 Add Optiondef 3 "Router" IPADDRESS 1 comment="Array of
router addresses ordered by preference" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 4 "Time Server" IPADDRESS 1
comment="Array of time server addresses, by preference" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 5 "Name Servers" IPADDRESS 1
comment="Array of name servers [IEN 116], by preference" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 6 "DNS Servers" IPADDRESS 1
comment="Array of DNS servers, by preference" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 7 "Log Servers" IPADDRESS 1
comment="Array of MIT_LCS UDP log servers on subnet" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 8 "Cookie Servers" IPADDRESS 1
comment="Array of cookie servers, RFC 865" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 9 "LPR Servers" IPADDRESS 1
comment="Array of RFC 1179 servers, by preference" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 10 "Impress Servers" IPADDRESS 1
comment="Array of Imagen Impress Servers" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 11 "Resource Location Servers" IPADDRESS
1 comment="Array of RFC 887 ResLoc Servers on subnet, by preference" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 12 "Host Name" STRING 0 comment="Host
name for client, RFC 1035 character set" ""
Dhcp Server 10.1.1.1 Add Optiondef 13 "Boot File Size" WORD 0 comment="Size
of boot image file in 512-octet blocks" 0
Dhcp Server 10.1.1.1 Add Optiondef 14 "Merit Dump File" STRING 0
comment="Path name for crash dump file" ""
Dhcp Server 10.1.1.1 Add Optiondef 15 "DNS Domain Name" STRING 0
comment="DNS Domain name for client resolutions" ""
Dhcp Server 10.1.1.1 Add Optiondef 16 "Swap Server" IPADDRESS 0
comment="Address of client's swap server" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 17 "Root Path" STRING 0 comment="Path
name for client's root disk, char set NVT ASCII" ""
Dhcp Server 10.1.1.1 Add Optiondef 18 "Extensions Path" STRING 0
comment="tftp file for option extensions" ""
Dhcp Server 10.1.1.1 Add Optiondef 19 "IP Layer Forwarding" BYTE 0
comment="Disable/enable IP packet forwarding on this client" 0
Dhcp Server 10.1.1.1 Add Optiondef 20 "Nonlocal Source Routing" BYTE 0
comment="Disable/enable nonlocal datagrams" 0
Dhcp Server 10.1.1.1 Add Optiondef 21 "Policy Filter Masks" IPADDRESS 1
comment="Destination/mask IP address pairs to filter source routes" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 22 "Max DG Reassembly Size" WORD 0
comment="Maximum size datagram for reassembly by client; max 576" 0
Dhcp Server 10.1.1.1 Add Optiondef 23 "Default IP Time-to-live" BYTE 0
comment="Default TTL for client's use on outgoing DGs" 0
Dhcp Server 10.1.1.1 Add Optiondef 24 "Path MTU Aging Timeout" DWORD 0
comment="Timeout in seconds for aging Path MTU values; RFC 1191" 0
Dhcp Server 10.1.1.1 Add Optiondef 25 "Path MTU Plateau Table" WORD 1
comment="MTU discovery sizes, sorted by size, all >= 68" 0
Dhcp Server 10.1.1.1 Add Optiondef 26 "MTU Option" WORD 0 comment="MTU
discovery size, >= 68" 0
Dhcp Server 10.1.1.1 Add Optiondef 27 "All subnets are local" BYTE 0
comment="The client assumes that all subnets are local" 0
Dhcp Server 10.1.1.1 Add Optiondef 28 "Broadcast Address" IPADDRESS 0
comment="Broadcast address" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 29 "Perform Mask Discovery" BYTE 0
comment="The client should use ICMP for subnet mask discovery." 0
Dhcp Server 10.1.1.1 Add Optiondef 30 "Mask Supplier Option" BYTE 0
comment="The client should respond to subnet mask requests via ICMP." 0
Dhcp Server 10.1.1.1 Add Optiondef 31 "Perform Router Discovery" BYTE 0
comment="The client should solicit routers using RFC 1256." 0
Dhcp Server 10.1.1.1 Add Optiondef 32 "Router Solicitation Address"
IPADDRESS 0 comment="Address to use for router solicitation" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 33 "Static Route Option" IPADDRESS 1
comment="Destination/router address pairs, in priority order" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 34 "Trailer Encapsulation" BYTE 0
comment="The client should negotiate use of trailers (RFC 983)." 0
Dhcp Server 10.1.1.1 Add Optiondef 35 "ARP Cache Timeout" DWORD 0
comment="Timeout in seconds for ARP cache entries" 0
Dhcp Server 10.1.1.1 Add Optiondef 36 "Ethernet Encapsulation" BYTE 0
comment="0=>client should use ENet V2; 1=> IEEE 802.3" 0
Dhcp Server 10.1.1.1 Add Optiondef 37 "TCP Default Time-to-live" BYTE 0
comment="TTL that client uses when sending TCP segments" 0
Dhcp Server 10.1.1.1 Add Optiondef 38 "Keepalive Interval" DWORD 0
comment="Keepalive timeout in seconds" 0
Dhcp Server 10.1.1.1 Add Optiondef 39 "Keepalive Garbage" BYTE 0
comment="Send garbage octet" 0
Dhcp Server 10.1.1.1 Add Optiondef 40 "NIS Domain Name" STRING 0
comment="Name of Network Information Service domain" ""
Dhcp Server 10.1.1.1 Add Optiondef 41 "NIS Servers" IPADDRESS 1
comment="Addresses of NIS servers on client's subnet" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 42 "NTP Servers" IPADDRESS 1
comment="Addresses of Network Time Protocol servers" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 43 "Vendor Specific Info" BINARY 0
comment="Embedded vendor-specific options" 00
Dhcp Server 10.1.1.1 Add Optiondef 44 "WINS/NBNS Servers" IPADDRESS 1
comment="NBNS Address(es) in priority order" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 45 "NetBIOS over TCP/IP NBDD" IPADDRESS 1
comment="NetBIOS over TCP/IP NBDD address(es) in priority order" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 46 "WINS/NBT Node Type" BYTE 0
comment="0x1 = B-node, 0x2 = P-node, 0x4 = M-node, 0x8 = H-node" 0
Dhcp Server 10.1.1.1 Add Optiondef 47 "NetBIOS Scope ID" STRING 0
comment="NetBIOS over TCP/IP Scope ID" ""
Dhcp Server 10.1.1.1 Add Optiondef 48 "X Window System Font" IPADDRESS 1
comment="Array of X Windows font servers" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 49 "X Window System Display" IPADDRESS 1
comment="Array of X Windows Display Mgr servers" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 51 "Lease" DWORD 0 comment="Client IP
address lease time in seconds" 0
Dhcp Server 10.1.1.1 Add Optiondef 58 "Renewal (T1) Time Value" DWORD 0
comment="Time between addr assignment to RENEWING state" 0
Dhcp Server 10.1.1.1 Add Optiondef 59 "Rebinding (T2) Time Value" DWORD 0
comment="Time from addr assignment to REBINDING state" 0
Dhcp Server 10.1.1.1 Add Optiondef 64 "NIS+ Domain Name" STRING 0
comment="The name of the client's NIS+ domain." ""
Dhcp Server 10.1.1.1 Add Optiondef 65 "NIS+ Servers" IPADDRESS 1 comment="A
list of IP addresses indicating NIS+ servers" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 66 "Boot Server Host Name" STRING 0
comment="TFTP boot server host name" ""
Dhcp Server 10.1.1.1 Add Optiondef 67 "Bootfile Name" STRING 0
comment="Bootfile Name" ""
Dhcp Server 10.1.1.1 Add Optiondef 68 "Mobile IP Home Agents" IPADDRESS 1
comment="Mobile IP home agents in priority order" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 69 "Simple Mail Transport Protocol (SMTP)
Servers" IPADDRESS 1 comment="List of SMTP servers available to the client"
0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 70 "Post Office Protocol (POP3) Servers"
IPADDRESS 1 comment="List of POP3 servers available to the client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 71 "Network News Transport Protocol
(NNTP) Servers" IPADDRESS 1 comment="List of NNTP servers available to the
client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 72 "World Wide Web (WWW) Servers"
IPADDRESS 1 comment="List of WWW servers available to the client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 73 "Finger Servers" IPADDRESS 1
comment="List of Finger servers available to the client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 74 "Internet Relay Chat (IRC) Servers"
IPADDRESS 1 comment="List of IRC servers available to the client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 75 "StreetTalk Servers" IPADDRESS 1
comment="List of StreetTalk servers available to the client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 76 "StreetTalk Directory Assistance
(STDA) Servers" IPADDRESS 1 comment="List of STDA servers available to the
client" 0.0.0.0
Dhcp Server 10.1.1.1 Add Optiondef 1 "Microsoft Disable Netbios Option "
DWORD 0 vendor="Microsoft Options" comment="Option for enabling or disabling
Netbios for Microsoft Windows 2000 Clients" 1
Dhcp Server 10.1.1.1 Add Optiondef 2 "Microsoft Release DHCP Lease On
Shutdown Option" DWORD 0 vendor="Microsoft Options" comment="Option for
enabling or disabling Windows 2000 Clients to release DHCP lease on
shutdown" 1
Dhcp Server 10.1.1.1 Add Optiondef 3 "Microsoft Default Router Metric Base"
DWORD 0 vendor="Microsoft Options" comment="Default Router Base Metrics for
Microsoft Windows 2000 Clients" 1
Dhcp Server 10.1.1.1 Add Optiondef 1 "Microsoft Disable Netbios Option "
DWORD 0 vendor="Microsoft Windows 2000 Options" comment="Option for enabling
or disabling Netbios for Microsoft Windows 2000 Clients" 1
Dhcp Server 10.1.1.1 Add Optiondef 2 "Microsoft Release DHCP Lease On
Shutdown Option" DWORD 0 vendor="Microsoft Windows 2000 Options"
comment="Option for enabling or disabling Windows 2000 Clients to release
DHCP lease on shutdown" 1
Dhcp Server 10.1.1.1 Add Optiondef 3 "Microsoft Default Router Metric Base"
DWORD 0 vendor="Microsoft Windows 2000 Options" comment="Default Router Base
Metrics for Microsoft Windows 2000 Clients" 0

# =====================================
# Add Optiondef End
# ====================================


# =====================================
# Set Optionvalue
# =====================================


# =====================================
# Set Optionvalue End
# =====================================


Dhcp Server 10.1.1.1 Set AuditLog "C:\WINDOWS\System32\dhcp"
Dhcp Server 10.1.1.1 Set DatabaseBackupInterval 60
Dhcp Server 10.1.1.1 Set DatabaseBackupPath
"C:\WINDOWS\System32\dhcp\backup"
Dhcp Server 10.1.1.1 Set DatabaseCleanupInterval 60
Dhcp Server 10.1.1.1 Set DatabaseLoggingFlag 1
Dhcp Server 10.1.1.1 Set DatabaseName "dhcp.mdb"
Dhcp Server 10.1.1.1 Set DatabasePath "C:\WINDOWS\System32\dhcp"
Dhcp Server 10.1.1.1 Set DatabaseRestoreFlag 0
Dhcp Server 10.1.1.1 Set DetectConflictRetry 0

# =====================================
# Add Scope
# =====================================

Dhcp Server 10.1.1.1 add scope 10.1.0.0 255.255.0.0 "TESST" ""
Dhcp Server 10.1.1.1 Scope 10.1.0.0 set state 1

# ======================================================================
# Start Add Ipranges to the Scope 10.1.0.0, Server 10.1.1.1
# ======================================================================


Dhcp Server 10.1.1.1 Scope 10.1.0.0 Add iprange 10.1.1.101 10.1.1.110

# ======================================================================
# End Add Ipranges to the Scope 10.1.0.0, Server 10.1.1.1
# ======================================================================


# ======================================================================
# Start Add Excluderanges to the Scope : 10.1.0.0, Server : 10.1.1.1
# ======================================================================



# ======================================================================
# End Add Excluderanges to the Scope : 10.1.0.0, Server : 10.1.1.1
# ======================================================================


# ======================================================================
# Start Add OptionValues to the Scope : 10.1.0.0, Server : 10.1.1.1
# ======================================================================


Dhcp Server 10.1.1.1 Scope 10.1.0.0 set optionvalue 51 DWORD "691200"

# ======================================================================
# End Add OptionValues to the Scope : 10.1.0.0, Server : 10.1.1.1
# ======================================================================


# ======================================================================
# Start Add ReservedIp to the Scope : 10.1.0.0, Server : 10.1.1.1
# ======================================================================


Dhcp Server 10.1.1.1 Scope 10.1.0.0 Add reservedip 10.1.1.101 000c2959c009
"TEST1" "" "BOTH"
Dhcp Server 10.1.1.1 Scope 10.1.0.0 Add reservedip 10.1.1.102 000c2959c010
"TEST2" "" "BOTH"

# ======================================================================
# End Add ReservedIp to the Scope : 10.1.0.0, Server : 10.1.1.1
# ======================================================================



# =====================================
# Add Scope End
# =====================================


# =====================================
# Add Super Scope
# =====================================


# =====================================
# Add Super Scope End
# =====================================

# =====================================
# Add MScope
# =====================================



# =====================================
# Add MScope End
# =====================================


# ==============================================================
# Configuration Information for Server 10.1.1.1 Ends
# ==============================================================



---------------------
--

Cheers,
(HOPEFULLY THIS INFORMATION HELPS YOU!)

# Jorge de Almeida Pinto # MVP Windows Server - Directory Services

BLOG (WEB-BASED)--> http://blogs.dirteam.com/blogs/jorge/default.aspx
BLOG (RSS-FEEDS)--> http://blogs.dirteam.com/blogs/jorge/rss.aspx
 
R

richard

Any reservation (active or not) should show up in the lease list.

Thanks Richard,

Yes, I can see them there them now. The reason I was interested in
this issue is that I was trying to add a reservation. My proposed
reservation was being refused, but if I simply used a different MAC
address, keeping the same ip address, it was accepted. This led me to
think that an entry for that particular MAC address must already
exist, even though it wasn't listed on the leases list, which led me
to wonder if there was any other way of listing reservations.

However, I've now found the offending reservation, through looking at
the dhcp log. Neither he MAC nor ip address for this offending entry
clashed with my proposed reservation, but its deletion solved the
problem.

Maybe the dhcp database can got corrupted.

Thanks for your help,

Richard
 
Ad

Advertisements


Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.

Ask a Question

Top