[SBS 2011] Slow DHCP
Posted on 2011-10-18
I have a SBS 2011, this is also the DHCP server for us.
I have problem with some PC's (most Windows 7). It takes a long time to start Windows and sometimes is the pc also slow by working. When the PC starts: 'Please wait' stuck for a long time. I think it is a DHCP / DNS problem. Can someone help me?
I have the following dhcp scope:
Start IP address: 172.16.0.1
End IP address: 172.16.3.254
Lease duration is limited to: 2 days
Enable DNS dynamic updates is turned of
Network Access Protection is disabled for this scope
On the tab 'Advanced': Assign IP addresses dynamically to clients of: DHCP
Address Pool: 172.16.0.1 - 172.16.3.254 (Address range for distribution)
172.16.0.20 - 172.16.0.60, 172.0.61 - 172.16.0.75, 172.16.0.200 - 172.16.0.220, 172.16.0.1 - 172.16.0.12 (IP addresses excluded from distribution)
The following reservations: 172.16.0191, 172.16.0.114, 172.16.0.91, 172.16.0.88
003 Router 172.16.0.1
006 DNS Servers 172.16.0.200 (SBS Server)
015 DNS Domain Name (Our domain.local)
044 WINS/NBNS Servers 172.16.0.200
046 WINS/NBT Node Type 0x8
IPV6 is also enabled in DHCP (00023 DNS Recursive Name Server and 00024 Domain Search List)
I have the following DNS settings on the SBS 2011 server:
Listen on: Only the following IP adresses (ipv6 address & 172.16.0.200 (SBS SERVER))
Forwarders: 220.127.116.11 (google) and 18.104.22.168 (opendns)
Sorry for my bad english...