topic Re: DHCP IP POOL in Wireless

DHCP IP POOL

yogesh1 — Mon, 05 Jul 2021 14:52:26 GMT

i have dhcp pool AC configure on Cisco 3750 where i already have 10.85.49.0/24 series but i want to add one more series because the 10.85.49.0 series is exhausted so i want to add 10.85.93.128/25 series in same pool so WiFi user can also get ip from this range. please suggest command how to add extra series in existing ip pool

or we have to also made any changes on switch interface aslo ..??

Re: DHCP IP POOL

Flavio Miranda — Wed, 15 Nov 2017 23:20:19 GMT

Hi @yogesh1

You can address this in two ways. First you can change the current scope to a bigger subnet, let's say /22. But if you intend to add a new scope then you can refers to the current scope and create a new VLAN.

This VLAN needs to be included on the switch trunk.

On the WLC you need to create a new dynamic interface on the same vlan as the new scope.

Then, you need to create an Interface group on the WLC and put the current dynamic interface and the new one.

Then you can tie the Interface group to the WLAN.

Doing this, the WLC will round robin between those to scopes.

-If I helped you somehow, please, rate it as useful.-

Re: DHCP IP POOL

yogesh1 — Thu, 16 Nov 2017 04:39:51 GMT

HI Flavio,

ip dhcp pool AC
   network 10.85.49.0 255.255.255.0
   default-router 10.85.49.1
   dns-server 137.40.35.12 10.85.28.33 10.81.248.31
   netbios-name-server 137.40.35.12 10.85.28.33
   lease 0 10

interface Vlan50
ip address 10.85.49.1 255.255.255.0
no ip redirects
no ip unreachables
end

These pool ac is configure with vlan 50 now i am planing to deploy below 10.85.93.128/25 with secondary ac pool name so by using this user in vlan 50 automatically get ip from range10.85.93.128 pool please confirm

interface Vlan50
ip address 10.85.93.129 255.255.255.128 seconday
no ip redirects
no ip unreachables
end

ip dhcp pool ACsecondary
   network 10.85.93.128 255.255.255.128
   default-router 10.85.93.129
   dns-server 137.40.35.12 10.85.28.33 10.81.248.31
   netbios-name-server 137.40.35.12 10.85.28.33
   lease 0 10

Re: DHCP IP POOL

Sandeep Choudhary — Thu, 16 Nov 2017 07:15:44 GMT

Hi,

Configure these on Cisco Switch:

interface Vlan50
ip address 10.85.49.1 255.255.255.0
no ip redirects
no ip unreachables
end
!
interface Vlan51
ip address 10.85.49.129 255.255.255.128
no ip redirects
no ip unreachables
end
!
ip dhcp pool AC
network 10.85.49.0 255.255.255.0
default-router 10.85.49.1
dns-server 137.40.35.12 10.85.28.33 10.81.248.31
netbios-name-server 137.40.35.12 10.85.28.33
lease 0 10
!
ip dhcp pool AC1
network 10.85.93.128 255.255.255.128
default-router 10.85.49.129
dns-server 137.40.35.12 10.85.28.33 10.81.248.31
netbios-name-server 137.40.35.12 10.85.28.33
lease 0 10
!
Int gig1/0/x -->Where WLC connected
switchport trunk allowed vlan add 51
!

After that you nee dto configure a new Dynamic interface on WLC.

1. Create a dynamic interface with a VLAN/IP address: VLAN51 , 10.85.93.130/25

2. Go to Controller > Interface Grpoups , create a new Int Group and add above two dynamcin interface(Vlan 50 and Vlan 51) to it.

3. Apply this Interface group to WLAN.

Regards

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Re: DHCP IP POOL

Flavio Miranda — Thu, 16 Nov 2017 08:26:44 GMT

Hi @yogesh1

The problem with your script is on the WLC side. You are going to end up with two IP on the vlan 50 however, you can't point the WLC to two dhcp server on the same dynamic interface and you can't create two dynamic interface with the same vlan tag.

In order to have two different dhcp range it is mandatory to use interface group on the WLC side with two independent dynamic interfaces.

The best solution is broader you currently dhcp range by changing the mask but if this will create conflict with other vlan then you need to create a new vlan and new scope.

-If I helped you somehow, please, rate it as useful.-

Re: DHCP IP POOL

yogesh1 — Thu, 16 Nov 2017 10:46:36 GMT

Hi Flavio,

IF we can not use two d/F ip range in same vlan 50 with D/F dhcp pool .

Also confirm me if we can use only one POOL AC and pass D/F ip range as secondary in it with the same vlan 50.

OR if we made two d/f pool with two d/f vlan so on wlc side we already had one interface where which we pass vlan 50 and also had only one ip 10.85.49.8 which we used to take wlc on remote where we did not pass the whole range.

so please let me know if we also pass vlan 51 so how to configure it in wlc so user get the ip from both ranges.

Re: DHCP IP POOL

yogesh1 — Thu, 16 Nov 2017 10:49:24 GMT

Hi Sandeep,

IF we can not use two d/F ip range in same vlan 50 with D/F dhcp pool .

Also confirm me if we can use only one POOL AC and pass D/F ip range as secondary in it with the same vlan 50.

so please let me know if we also pass vlan 51 so how to configure it in wlc so user get the ip from both ranges.

Also find attachment for refernce

Re: DHCP IP POOL

Sandeep Choudhary — Thu, 16 Nov 2017 10:52:39 GMT

as Falvio mentioned...you have two ways

Either

Make the current subnet to /22 so that clinet will get IP in this range 10.85.48.1 - 10.85.51.254.

Use a diff vlan on swicth, diff dynamic interface on wlc and combine vlan 50 interface and vlan 51 interface in a group on WLC.

Regards

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