C3750 Dhcp pool static IP

srikanth ath · ‎09-22-2011

Im using wifi connected to C3750 catalyst switch , switch is the DHCP server for the vlan created 101

Here are my configuaration:

ip dhcp excluded-address 10.10.30.1 10.10.30.10

! ip dhcp pool init

network 10.10.30.0 255.255.255.0

default-router 10.10.X.X

dns-server 10.10.X.X 8.8.4.4

!

ip dhcp pool SR

host 10.10.30.151 255.255.255.0

client-identifier 01ac.7289.0d86.67

client-name Client1

interface Vlan101

description internal userwifi

ip address 10.10.30.1 255.255.255.0

im using WI-fi to the vlan assigned

verification:

wavel3#sh ip dhcp binding

IP address Client-ID/ Lease expiration Type

Hardware address

10.10.30.11 01ac.7289.0d86.67 Mar 03 1993 11:13 PM Automatic

10.10.30.151 01ac.7289.0d86.67 Infinite Manual

Its taking automatic IP to the client machine connected to wifi

i need to get the manual IP assigned to the loop, any suggestions will be appreciated

where am i going wrong in this scenario.

I have about 40 client machines and all have to get the ip Mac based static assigned to the pool.

Thanks & regards

Srikanth

johnlloyd_13 · ‎09-22-2011

hi,

try re-configuring as per below and try again. don't forget to do a clear ip dhcp binding.

ip dhcp pool SR

host 10.10.30.151 255.255.255.0

client-identifier 01ac.7289.0d86.67

client-name SR

srikanth ath · ‎09-23-2011

done withe chages as above mentioned created the pool name and client name same .but the client is getting the ip 10.10.30.11 where he should get 10.10.30.151.

ip dhcp excluded-address 10.10.30.1 10.10.30.10

! ip dhcp pool init

network 10.10.30.0 255.255.255.0

default-router 10.10.X.X

dns-server 10.10.X.X 8.8.4.4

!

ip dhcp pool SR

host 10.10.30.151 255.255.255.0

client-identifier 01ac.7289.0d86.67

client-name SR

interface Vlan101

description internal userwifi

ip address 10.10.30.1 255.255.255.0

help me out please?

thanks and regards

srikanth

cadet alain · ‎09-23-2011

Hi,

You say it is taking the other IP from the output of sh ip dhcp binding or from ipconfig/all on machine?

Regards.

Alain.

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srikanth ath · ‎09-23-2011

Problem fixed. its working now . as i reebooted the Wireless Access points.

now the new problem arises. i got to add about 40 mac-address so i need to use 40 ips.

if i excluded all oter IPs still client can get the ip from excluded address

!

ip dhcp excluded-address 10.10.30.1 10.10.30.10

ip dhcp excluded-adress 10.10.30.50 10.10.30.254

is this is the correct way to configure. as i only need 40 ips from the network of 10.10.30.0 as for security i need to give static ips to only 40 laptops not to any other devices used internal network.

hope u got my point can any one show me the way to configure or is ther any other security method i can take or configure in L3 switch. t prevent access other than 40 laptops...

thanks & regards

srikanth

cadet alain · ‎09-23-2011

Hi,

if the machine acquired an ip from dhcp before you madse these changes then of course you must release and renew your lease on the clients.

You want 40 IPs as statically configured and no other machine should get a DHCP address? is that so?

then excluding these IPs from the range seems ok.

Regards.

Alain

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srikanth ath · ‎09-23-2011

HI Alain

thanks for the update, will reply if i had problem with it..

Thanks & regards

srikanth

srikanth ath · ‎09-23-2011

Hi

the problem persits i have excluded ips for and given only 10 ips in a network range for the vlan WIFI client usage

but almost 20 people can get the IP from it..and accessing internet ...

IP dhcp excluded-address 10.10.30.4 10.10.30.141

ip dhcp excluded-address 10.10.30.152 10.10.30.255

! ip dhcp pool init

network 10.10.30.0 255.255.255.0

default-router 10.10.X.X

dns-server 10.10.X.X 8.8.4.4

!

ip dhcp pool SR

host 10.10.30.151 255.255.255.0

client-identifier 01ac.7289.0d86.67

client-name SR

interface Vlan101

description internal userwifi

ip address 10.10.30.1 255.255.255.0

problem with the Switch configuration .or WIFi access point anyhow the simple point is we have excluded ipaddress in dhcp in L3 switch right. but still the client can get an ip from exluded ip list ..where should it be. the problem.

THanks and regards

Srikanth

cadet alain · ‎09-23-2011

Hi,

they shouldn't get an excluded-address.

Clear all dhcp bindings stop dhcp service, release IP on client misbehaving

fire up a sniffer like wireshark and restart DHCP service on switch, renew IP and post pcap file.

Also post output of sh run | s dhcp

Regards.

Alain.

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