DHCP - offer same IP to clients if available.

We have a Win Server 2008 R2 DHCP server with default lease durations of 8 days.  Our address pool consists of about 500 IPs of which we generally use only 200-300.
We noticed that when a computer is disconnected from the network for 9 days, its previously assigned IP address is handed out to other DHCP clients, even though there are about 200 IPs available that have never, ever been assigned to any DHCP client and
is free to use.  The computer that was then offline for 9 days subsequently gets handed a new IP address.
How can we get the server to use all 500 IPs first, before recycling IPs from expired leases?

AFAIK, I do not think  you can change the allocation algorithm. 
Though not a answer to your question, but in order to achieve what you want, maybe you can play with the lease duration.  For example:
- 400 IP with lease time of 16 days.
- 100 IP with lease duration of 1 days (just in case 16 days is too long and you ended up with not enough IP, hence, this pools is serve as buffer)
-- wsn

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    AP system information:
     Product/Model Number:
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     Top Assembly Serial Number:
    [removed]
     System Software Filename:
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  • No client certificate available, sending empty certificate message

    Dear Experts,
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    Date : 11/16/2011
    Time : 8:49:11:423
    Message : additional info ssl_debug(9): Starting handshake (iSaSiLk 4.3)...
    ssl_debug(9): Sending v3 client_hello message to preprod.connect.elemica.com:443, requesting version 3.2...
    ssl_debug(9): Received v3 server_hello handshake message.
    ssl_debug(9): Server selected SSL version 3.1.
    ssl_debug(9): Server created new session 22:E7:C0:9E:C1:D2:78:83...
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    ssl_debug(9): CompressionMethod selected by server: NULL
    ssl_debug(9): Received certificate handshake message with server certificate.
    ssl_debug(9): Server sent a 1024 bit RSA certificate, chain has 2 elements.
    ssl_debug(9): ChainVerifier: No trusted certificate found, OK anyway.
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    ssl_debug(9): Accepted certificate types: RSA, DSA
    ssl_debug(9): Accepted certificate authorities:
    ssl_debug(9):   CN=QuoVadis Global SSL ICA,OU=www.quovadisglobal.com,O=QuoVadis Limited,C=BM
    ssl_debug(9):   CN=AAA Certificate Services,O=Comodo CA Limited,L=Salford,ST=Greater Manchester,C=GB
    ssl_debug(9):   CN=CSF - Classe III - Sign et Crypt,OU=Certification Professionnelle,O=Autorite Consulaire
    ssl_debug(9):   CN=GTE CyberTrust Global Root,OU=GTE CyberTrust Solutions, Inc.,O=GTE Corporation,C=US
    ssl_debug(9):   CN=Entrust.net Certification Authority (2048),OU=(c) 1999 Entrust.net Limited,OU=www.entrust.net/CPS_2048 incorp. by ref. (limits liab.),O=Entrust.net
    ssl_debug(9):   CN=DPWN SSL CA I2 PS,OU=I2 PS,O=Deutsche Post World Net
    ssl_debug(9):   CN=CSF,O=Autorite Consulaire
    ssl_debug(9):   C=BE,O=GlobalSign nv-sa,OU=RootSign Partners CA,CN=GlobalSign RootSign Partners CA
    ssl_debug(9):   CN=Dell Inc. Enterprise Utility CA1,O=Dell Inc.
    ssl_debug(9):   EMAIL=premium-server(a)thawte.com,CN=Thawte Premium Server CA,OU=Certification Services Division,O=Thawte Consulting cc,L=Cape Town,ST=Western Cape,C=ZA
    ssl_debug(9):   CN=TC TrustCenter Class 2 L1 CA XI,OU=TC TrustCenter Class 2 L1 CA,O=TC TrustCenter GmbH,C=DE
    ssl_debug(9):   CN=VeriSign Class 3 Extended Validation SSL SGC CA,OU=Terms of use at https://www.verisign.com/rpa (c)06,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   OU=VeriSign Trust Network,OU=(c) 1998 VeriSign, Inc. - For authorized use only,OU=Class 3 Public Primary Certification Authority - G2,O=VeriSign, Inc.,C=US
    ssl_debug(9):   CN=TC TrustCenter SSL CA I,OU=TC TrustCenter SSL CA,O=TC TrustCenter GmbH,C=DE
    ssl_debug(9):   CN=Entrust Root Certification Authority,OU=(c) 2006 Entrust, Inc.,OU=www.entrust.net/CPS is incorporated by reference,O=Entrust, Inc.,C=US
    ssl_debug(9):   CN=VeriSign Class 3 International Server CA - G3,OU=Terms of use at https://www.verisign.com/rpa (c)10,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   CN=Meijer ipprod,OU=IT,OU=Merch,O=Meijer Stores Limited,L=Walker,ST=MI,C=US
    ssl_debug(9):   CN=COMODO Certification Authority,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB
    ssl_debug(9):   OU=www.verisign.com/CPS Incorp.by Ref. LIABILITY LTD.(c)97 VeriSign,OU=VeriSign International Server CA - Class 3,OU=VeriSign, Inc.,O=VeriSign Trust Network
    ssl_debug(9):   CN=UTN - DATACorp SGC,OU=http://www.usertrust.com,O=The USERTRUST Network,L=Salt Lake City,ST=UT,C=US
    ssl_debug(9):   CN=Deutsche Telekom CA 5,OU=Trust Center Deutsche Telekom,O=T-Systems Enterprise Services GmbH,C=DE
    ssl_debug(9):   CN=TC TrustCenter Class 2 CA II,OU=TC TrustCenter Class 2 CA,O=TC TrustCenter GmbH,C=DE
    ssl_debug(9):   CN=VeriSign Class 3 Secure Server CA - G2,OU=Terms of use at https://www.verisign.com/rpa (c)09,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   OU=www.verisign.com/CPS Incorp.by Ref. LIABILITY LTD.(c)97 VeriSign,OU=VeriSign International Server CA - Class 3,OU=VeriSign, Inc.,O=VeriSign Trust Network
    ssl_debug(9):   CN=Thawte SGC CA,O=Thawte Consulting (Pty) Ltd.,C=ZA
    ssl_debug(9):   CN=Bertschi CA,O=Bertschi AG (Schweiz),L=Duerrenaesch,ST=Switzerland,C=CH
    ssl_debug(9):   CN=Cybertrust SureServer CA,O=GlobalSign Inc
    ssl_debug(9):   CN=VeriSign Class 3 Secure Server CA,OU=Terms of use at https://www.verisign.com/rpa (c)05,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   EMAIL=server-certs(a)thawte.com,CN=Thawte Server CA,OU=Certification Services Division,O=Thawte Consulting cc,L=Cape Town,ST=Western Cape,C=ZA
    ssl_debug(9):   CN=Mark Van Hamme,O=Brain2 BVBA,L=Brussels,ST=Brabant,C=BE
    ssl_debug(9):   CN=DigiCert High Assurance EV Root CA,OU=www.digicert.com,O=DigiCert Inc,C=US
    ssl_debug(9):   EMAIL=bis.at(a)siemens.com,CN=bis.siemens.at,OU=SBS ORS EDO,O=Siemens Business Services,L=Vienna,ST=Vienna,C=AT
    ssl_debug(9):   CN=VeriSign Class 1 Public Primary Certification Authority - G3,OU=(c) 1999 VeriSign, Inc. - For authorized use only,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   CN=mail2.adr-logistics.hu,O=ADR Logistics Kft.,L=Gyu00E1l,ST=Pest,C=HU
    ssl_debug(9):   EMAIL=brent.kemp(a)sscoop.com,CN=bacchusdevp.sscoop.com,OU=IS,O=Southern States Cooperative Inc,L=Richmond,ST=VA,C=US
    ssl_debug(9):   CN=Cybertrust SureServer Standard Validation CA,O=Cybertrust Inc
    ssl_debug(9):   OU=Go Daddy Class 2 Certification Authority,O=The Go Daddy Group, Inc.,C=US
    ssl_debug(9):   CN=Certipost E-Trust Secondary Normalised CA for Legal Persons,O=Certipost s.a./n.v.,C=BE
    ssl_debug(9):   EMAIL=cert(a)bit-serv.de,CN=BIT-SERV GmbH Root CA,O=BIT-SERV GmbH,C=DE
    ssl_debug(9):   CN=SAP_elemica_tester
    ssl_debug(9):   CN=GeoTrust Global CA,O=GeoTrust Inc.,C=US
    ssl_debug(9):   OU=Class 1 Public Primary Certification Authority,O=VeriSign, Inc.,C=US
    ssl_debug(9):   CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE
    ssl_debug(9):   CN=Montova Root CA,OU=Root CA,O=Montova,C=BE
    ssl_debug(9):   CN=Baltimore CyberTrust Root,OU=CyberTrust,O=Baltimore,C=IE
    ssl_debug(9):   CN=Dell Inc. Enterprise CA,O=Dell Inc.
    ssl_debug(9):   CN=COMODO High-Assurance Secure Server CA,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB
    ssl_debug(9):   EMAIL=support(a)tamgroup.com,OU=Engineering,O=Tamgroup,ST=California,L=San Anselmo,C=US,CN=Tamgroup
    ssl_debug(9):   CN=GlobalSign Organization Validation CA,O=GlobalSign,OU=Organization Validation CA
    ssl_debug(9):   CN=Certinomis AC 1 u00E9toile,OU=0002 433998903,O=Certinomis,C=FR
    ssl_debug(9):   CN=GlobalSign ServerSign CA,OU=ServerSign CA,O=GlobalSign nv-sa,C=BE
    ssl_debug(9):   CN=QuoVadis Root CA 2,O=QuoVadis Limited,C=BM
    ssl_debug(9):   CN=AddTrust Class 1 CA Root,OU=AddTrust TTP Network,O=AddTrust AB,C=SE
    ssl_debug(9):   CN=Equifax Secure Global eBusiness CA-1,O=Equifax Secure Inc.,C=US
    ssl_debug(9):   CN=GlobalSign Organization Validation CA,O=GlobalSign,OU=Organization Validation CA
    ssl_debug(9):   CN=thawte Primary Root CA,OU=(c) 2006 thawte, Inc. - For authorized use only,OU=Certification Services Division,O=thawte, Inc.,C=US
    ssl_debug(9):   CN=Certipost E-Trust Primary Normalised CA,O=Certipost s.a./n.v.,C=BE
    ssl_debug(9):   CN=Thawte DV SSL CA,OU=Domain Validated SSL,O=Thawte, Inc.,C=US
    ssl_debug(9):   OU=Equifax Secure Certificate Authority,O=Equifax,C=US
    ssl_debug(9):   CN=preprod.connect.elemica.com,OU=CONNECTED SOLUTIONS,O=Elemica,L=Wayne,ST=Pennsylvania,C=US
    ssl_debug(9):   CN=Certinomis - Autoritu00E9 Racine,OU=0002 433998903,O=Certinomis,C=FR
    ssl_debug(9):   CN=DPWN Root CA R2 PS,OU=IT Services,O=Deutsche Post World Net,DC=com
    ssl_debug(9):   CN=Thawte Test CA Root,OU=TEST TEST TEST,O=Thawte Certification,ST=FOR TESTING PURPOSES ONLY,C=ZA
    ssl_debug(9):   OU=Class 3 Public Primary Certification Authority,O=VeriSign, Inc.,C=US
    ssl_debug(9):   EMAIL=santiago.tolosa(a)eu.rhodia.com,CN=Rhodia Development CA,OU=ISF - WARTE,O=Rhodia,L=La Villette,ST=France,C=FR
    ssl_debug(9):   CN=Entrust.net Secure Server Certification Authority,OU=(c) 1999 Entrust.net Limited,OU=www.entrust.net/CPS incorp. by ref. (limits liab.),O=Entrust.net,C=US
    ssl_debug(9):   CN=DigiCert High Assurance CA-3,OU=www.digicert.com,O=DigiCert Inc,C=US
    ssl_debug(9):   CN=Groep H. Essers TEST (99805D6DA33FCC1700010002),O=Montova,C=BE
    ssl_debug(9):   serialNumber=07969287,CN=Go Daddy Secure Certification Authority,OU=http://certificates.godaddy.com/repository,O=GoDaddy.com, Inc.,L=Scottsdale,ST=Arizona,C=US
    ssl_debug(9):   CN=VeriSign Class 3 Secure Server 1024-bit CA - G2,OU=Terms of use at https://www.verisign.com/rpa (c)09,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   serialNumber=10688435,CN=Starfield Secure Certification Authority,OU=http://certificates.starfieldtech.com/repository,O=Starfield Technologies, Inc.,L=Scottsdale,ST=Arizona,C=US
    ssl_debug(9):   CN=Conextrade,OU=Swisscom IT,O=Swisscom AG,L=Zurich,ST=Zurich,C=CH,EMAIL=ccc.eTrade(a)swisscom.com
    ssl_debug(9):   CN=b2bproto.basf-corp.com,OU=Corporate IS,O=BASF Corporation,L=Mount Olive,ST=New Jersey,C=US
    ssl_debug(9):   CN=GlobalSign Domain Validation CA - G2,O=GlobalSign nv-sa,C=BE
    ssl_debug(9):   CN=Swisscom Root CA 1,OU=Digital Certificate Services,O=Swisscom,C=ch
    ssl_debug(9):   CN=GeoTrust DV SSL CA,OU=Domain Validated SSL,O=GeoTrust Inc.,C=US
    ssl_debug(9):   EMAIL=!sysadmin(a)elemica.com,CN=www.elemica.com,OU=Connected Solutions,O=Elemica, Inc,L=Wayne,ST=Pennsylvania,C=US
    ssl_debug(9):   CN=GeoTrust SSL CA,O=GeoTrust, Inc.,C=US
    ssl_debug(9):   CN=RapidSSL CA,O=GeoTrust, Inc.,C=US
    ssl_debug(9):   CN=Entrust Certification Authority - L1E,OU=(c) 2009 Entrust, Inc.,OU=www.entrust.net/rpa is incorporated by reference,O=Entrust, Inc.,C=US
    ssl_debug(9):   CN=EAS,O=COMPUDATA EDI Dienstleister,C=CH,EMAIL=helpdesk.dl(a)compudata.ch
    ssl_debug(9):   CN=GlobalSign Domain Validation CA,O=GlobalSign nv-sa,OU=Domain Validation CA,C=BE
    ssl_debug(9):   CN=GlobalSign Primary Secure Server CA,OU=Primary Secure Server CA,O=GlobalSign nv-sa,C=BE
    ssl_debug(9):   CN=AddTrust External CA Root,OU=AddTrust External TTP Network,O=AddTrust AB,C=SE
    ssl_debug(9):   CN=Entrust Root Certification Authority,OU=(c) 2006 Entrust, Inc.,OU=www.entrust.net/CPS is incorporated by reference,O=Entrust, Inc.,C=US
    ssl_debug(9):   CN=Thawte SSL CA,O=Thawte, Inc.,C=US
    ssl_debug(9):   CN=Entrust Certification Authority - L1C,OU=(c) 2009 Entrust, Inc.,OU=www.entrust.net/rpa is incorporated by reference,O=Entrust, Inc.,C=US
    ssl_debug(9):   CN=UTN-USERFirst-Hardware,OU=http://www.usertrust.com,O=The USERTRUST Network,L=Salt Lake City,ST=UT,C=US
    ssl_debug(9):   EMAIL=vladimir.polak(a)esa.ch,CN=Vladimir Polak,O=Einkaufsorganisation des Schweizerischen Auto- und Motorfahrzeuggewerbes,C=CH
    ssl_debug(9):   CN=IT Directions and Strategies,OU=ITDS EDI,ST=WI,C=US,L=Hartland,EMAIL=aklumpp(a)itdsllc.com,O=ITDS EDI
    ssl_debug(9):   CN=Entrust Certification Authority - L1B,OU=(c) 2008 Entrust, Inc.,OU=www.entrust.net/CPS is incorporated by reference,OU=CPS CONTAINS IMPORTANT LIMITATIONS OF WARRANTIES AND LIABILITY,OU=AND ADDITIONAL TERMS GOVERNING USE AND RELIANCE,O=Entrust, Inc.,C=US
    ssl_debug(9):   CN=GlobalSign Organization Validation CA - G2,O=GlobalSign nv-sa,C=BE
    ssl_debug(9):   CN=VeriSign Class 1 Individual Subscriber CA - G3,OU=Persona Not Validated,OU=Terms of use at https://www.verisign.com/rpa (c)09,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   CN=VeriSign Class 1 Individual Subscriber CA - G2,OU=Persona Not Validated,OU=Terms of use at https://www.verisign.com/rpa (c)05,OU=VeriSign Trust Network,O=VeriSign, Inc.,C=US
    ssl_debug(9):   CN=TeleSec ServerPass CA 1,OU=Trust Center Services,O=T-Systems International GmbH,C=DE
    ssl_debug(9):   CN=TC TrustCenter Class 3 L1 CA V,OU=TC TrustCenter Class 3 L1 CA,O=TC TrustCenter GmbH,C=DE
    ssl_debug(9):   C=NL,ST=Zuid-Holland,L=Spijkenisse,O=De Rijke Transport,OU=ICT,CN=smtphost.derijke.com
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