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<div>you dont want to define this as a shared network.</div>
<div><font size="2" face="tahoma">On the switch you have also confused the two networks using the helper-address statement.</font></div>
<div><font size="2" face="tahoma">if you want these vlans to be separate networks they must remain separate. (layer 2)</font></div>
<div><font size="2" face="tahoma">at some point the vlans will connect to a router. (layer 3) on that router will be a gateway interface. that interface will usually have a bootphelper statement that forwards broadcast dhcp traffic to the address of your dhcp
server (and back)</font></div>
<div><font size="2" face="tahoma"></font> </div>
<div>
<div><font size="2" face="Tahoma">Randall Grimshaw <a href="mailto:rgrimsha@syr.edu">
rgrimsha@syr.edu</a></font></div>
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<font color="#000000" size="2" face="Tahoma"><b>From:</b> dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org [dhcp-users-bounces+rgrimsha=syr.edu@lists.isc.org] On Behalf Of Difan Zhao [difan.zhao@guest-tek.com]<br>
<b>Sent:</b> Tuesday, June 08, 2010 1:56 PM<br>
<b>To:</b> dhcp-users@lists.isc.org<br>
<b>Subject:</b> <br>
</font><br>
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<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Hi experts,<br>
<br>
I am trying to provide dynamic IP addresses for devices that are resided on VLAN 101. The server is currently providing 172.17.x.x/16 range for its own VLAN 417. My server is RHEL4 running DHCPD version 3.0.1. The core switch (Cisco 3750) is configured with
“ip helper-address 172.17.1.1” on VLAN 101 interface. Here is my dhcpd.conf file:<br>
<br>
authoritative;<br>
ddns-update-style ad-hoc;<br>
omapi-port 7911;<br>
<br>
shared-network eth1<br>
{<br>
option domain-name "globalsuite.net";<br>
option domain-name-servers 4.2.2.1;<br>
default-lease-time 88200;<br>
max-lease-time 88200;<br>
<br>
subnet 172.17.0.0 netmask 255.255.0.0<br>
{<br>
range 172.17.1.10 172.17.199.254;<br>
option broadcast-address 172.17.255.255;<br>
option routers 172.17.1.1;<br>
option subnet-mask 255.255.0.0;<br>
}<br>
<br>
subnet 192.168.1.0 netmask 255.255.255.0<br>
{<br>
range 192.168.1.10 192.168.1.250;<br>
option broadcast-address 192.168.1.255;<br>
option routers 192.168.1.254;<br>
option subnet-mask 255.255.255.0;<br>
}<br>
}<br>
<br>
Here is my eth1:<br>
[root@NE_OVI ~]# ifconfig eth1<br>
eth1 Link encap:Ethernet HWaddr 00:15:C5:F4:CB:22<br>
inet addr:172.17.1.1 Bcast:172.17.255.255 Mask:255.255.0.0<br>
<br>
Here is my routing table on the server. The eth0 is WAN interface, connected with ISP. The eth1 is LAN interface on VLAN 101. The server is also doing NAT/PAT for the LAN users.<br>
<br>
[root@NE_OVI ~]# route -n<br>
Kernel IP routing table<br>
Destination Gateway Genmask Flags Metric Ref Use Iface<br>
210.83.99.128 0.0.0.0 255.255.255.128 U 0 0 0 eth0<br>
192.168.1.0 172.17.254.1 255.255.255.0 UG 0 0 0 eth1<br>
0.0.0.0 210.83.99.129 0.0.0.0 UG 0 0 0 eth0<br>
<br>
Configs on the switch:<br>
!<br>
interface Vlan417<br>
ip address 172.17.254.1 255.255.0.0<br>
no ip route-cache<br>
end<br>
!<br>
interface Vlan101<br>
ip address 192.168.1.254 255.255.255.0<br>
ip helper-address 172.17.1.1<br>
end<br>
!<br>
<br>
However my laptop on the VLAN 101 keeps getting IP of 172.17.x.x/16 range... Here is the log.</span></font></p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt"></span></font> </p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Jun 8 11:53:47 NE_OVI dhcpd: DHCPDISCOVER from 00:11:43:fe:80:19 (ne-l-d400tester) via 192.168.1.254</span></font></p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Jun 8 11:53:47 NE_OVI dhcpd: DHCPOFFER on 172.17.199.253 to 00:11:43:fe:80:19 (ne-l-d400tester) via 192.168.1.254</span></font></p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Jun 8 11:53:47 NE_OVI dhcpd: if ne-l-d400tester.globalsuite.net IN A rrset doesn't exist add ne-l-d400tester.globalsuite.net
44100 IN A 172.17.199.253: timed out.</span></font></p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Jun 8 11:53:47 NE_OVI dhcpd: DHCPREQUEST for 172.17.199.253 (172.17.1.1) from 00:11:43:fe:80:19 (ne-l-d400tester) via 192.168.1.254</span></font></p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Jun 8 11:53:47 NE_OVI dhcpd: DHCPACK on 172.17.199.253 to 00:11:43:fe:80:19 (ne-l-d400tester) via 192.168.1.254</span></font></p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt"></span></font> </p>
<p class="MsoNormal"><font color="black" size="2" face="Verdana"><span style="FONT-FAMILY: Verdana; COLOR: black; FONT-SIZE: 10pt">Where do I do wrong? How do I fix it?<br>
<br>
Thanks!</span></font><font size="2" face="Arial"><span style="FONT-FAMILY: Arial; FONT-SIZE: 10pt"></span></font></p>
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Office: +1 (403) 509 1010 ext 3048<br>
Cell: +1 (403) 689 7514</span></font><font color="black" size="2" face="Book Antiqua"><span style="FONT-FAMILY: 'Book Antiqua'; COLOR: black; FONT-SIZE: 10pt"></span></font></p>
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