<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:"Calibri","sans-serif";}
.MsoChpDefault
{mso-style-type:export-only;
font-family:"Calibri","sans-serif";}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I’ve gone through the archives, but haven’t found a solution to using a single dhcp server<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>to service multiple subnets.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The subnets are set up on a router (non-cisco) that uses dhcp-relay to pass dhcp requests <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>through the configured switch interfaces. The switches are layer 2 and also are configured<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>for dhcp relay.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The dhcp request packets show up at the server.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The dhcp server then assigns and address and sends it to the router’s address.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>The problem I’ve run into is the server is always sending the first dhcp address in the first configured<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>subnet regardless of the subnet the request comes from.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>In other words, dhcp ip address assigned is always 10.1.6.200 even if the request comes from 10.1.8.0 subnet.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>If the dhcp request comes from the 10.1.6.0 subnet, all is fine.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>I think the problem is in the dhcp server configuration:<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option domain-name "TestLab.NSC";<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>default-lease-time 600;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>max-lease-time 7200;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>authoritative;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>log-facility local7;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>subnet 10.1.6.0 netmask 255.255.255.0 {<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option routers 10.1.6.2;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>range 10.1.6.200 10.1.6.254;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option subnet-mask 255.255.255.0;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>}<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>subnet 10.1.7.0 netmask 255.255.255.0 {<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option routers 10.1.6.2;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>range 10.1.7.200 10.1.7.254;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option subnet-mask 255.255.255.0;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>}<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>subnet 10.1.8.0 netmask 255.255.255.0 {<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option routers 10.1.6.2;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>range 10.1.8.200 10.1.8.254;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option subnet-mask 255.255.255.0;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>}<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>subnet 10.1.9.0 netmask 255.255.255.0 {<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option routers 10.1.6.2;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>range 10.1.9.200 10.1.9.254;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option subnet-mask 255.255.255.0;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>}<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>subnet 10.1.5.0 netmask 255.255.255.0 {<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option routers 10.1.6.2;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>range 10.1.5.200 10.1.5.254;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>option subnet-mask 255.255.255.0;<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>}<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>This is the entire configuration, there must be something missing. I’m not using dns, just trying to get addresses assigned <o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>to the right vlan/subnet. The server is attached to 10.1.6.0/24.<o:p></o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'><o:p> </o:p></span></font></p><p class=MsoNormal><font size=2 face=Calibri><span style='font-size:11.0pt'>Thanks, ms<o:p></o:p></span></font></p></div></body></html>