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DHCP Pools

ignaciobajo
Level 1
Level 1

‎08-23-2011 10:22 AM - edited ‎03-04-2019 01:22 PM

I have a Cisco 2811 router with C288nm-advsecuruityk9-mz.151-4-4.M.bin IOS version.

The router has two LAN interface FE 0/0 and FE 0/1.

The router have too, two interfaces ADSL ATM0.0.0 and ATM 0.0.1, both are connect to internet

I need the next configuration

  • The interface FE 0/0 is directly connect to a Switch A
  • The interface FE 0/1 is directly connect to a Access Point Cisco
  • The Access Point and the Switch is not connecting between.
  • The subnet of Switch A and AP are different (Switch A 192.168.180.0/24 and AP 192.168.181.0/24)
  • The devices in the switch A have dynamic IP address, the router must be a DHCP pool to assign theses IP.
  • The device in the AP have dynamic IP address, the router must be a DHCP pool to assign theses IP.

I created two DHCP pools in the router, one for the subnet 192.168.180.0 and other for 192.168.181.0, but the devices of FE 0/0 assign IP of 192.168.180.0 or 192.168.181.0, but not only in the 192.168.180.0

I think create a two VLAN in the router, but is not supported.

Best regards

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5 Replies 5

Edison Ortiz
Hall of Fame
Hall of Fame

‎08-23-2011 02:54 PM

Did you include the default router within both DHCP pools?

Can you please post your entire config?

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ignaciobajo
Level 1
Level 1
In response to Edison Ortiz

‎08-24-2011 02:31 AM

Yes, I include default router in DHCP pools.

Sorry, I don´t post running config, because the ruter is not config now.

The problem isn´t access to internet, the device access internet correctly, the problem is the next:

* I have too pools DHCP_1 in the subnet 192.168.180.0 and DHCP_2 in the subnet 192.168.181.0

* I need that the the devide conect in FE 0/0, assign Ip of the pool DHCP_1

* I need that the the devide conect in FE 0/1, assign Ip of the pool DHCP_2

but the device in FE0/0 assign ip of the DCHP_1 and DCHP_2, the same in the FE0/1.

Is is necesary i reconfigure the router and send you the config

Best regards

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cadet alain
VIP Alumni
VIP Alumni
In response to ignaciobajo

‎08-24-2011 04:03 AM

Hi,

sending the config would be great indeed.

Regards.

Alain.

Don't forget to rate helpful posts.
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Edison Ortiz
Hall of Fame
Hall of Fame
In response to ignaciobajo

‎08-24-2011 06:42 AM

I put your scenario in a lab and it worked as designed:

ip dhcp excluded-address 192.168.181.1

ip dhcp excluded-address 192.168.180.1

!

ip dhcp pool NET_180

   network 192.168.180.0 255.255.255.0

   domain-name cisco.com

   dns-server 4.2.2.1

   default-router 192.168.180.1

!

ip dhcp pool NET_181

   network 192.168.181.0 255.255.255.0

   domain-name cisco.com

   dns-server 4.2.2.1

   default-router 192.168.181.1

I connected a router on an interface with segment .180 and another router on segment .181

Here is the debug once I enable the interfaces: (segment 180)

*Aug 24 09:36:25.967: DHCPD: DHCPDISCOVER received from client 0063.6973.636f.2d63.6130.312e.3162.6538.2e30.3030.382d.4661.302f.30 on interface FastEthernet0/0.

*Aug 24 09:36:25.967: DHCPD: Seeing if there is an internally specified pool class:

*Aug 24 09:36:25.971:   DHCPD: htype 1 chaddr ca01.1be8.0008

*Aug 24 09:36:25.971:   DHCPD: remote id 020a0000c0a8b40100000000

*Aug 24 09:36:25.971:   DHCPD: circuit id 00000000

*Aug 24 09:36:25.971: DHCPD: Allocate an address without class information (192.168.180.0)

*Aug 24 09:36:27.971: DHCPD: Adding binding to radix tree (192.168.180.2)

*Aug 24 09:36:27.971: DHCPD: Adding binding to hash tree

*Aug 24 09:36:27.971: DHCPD: assigned IP address 192.168.180.2 to client 0063.6973.636f.2d63.6130.312e.3162.6538.2e30.3030.382d.4661.302f.30.

segment (181)

*Aug 24 09:38:14.339: DHCPD: Sending notification of DISCOVER:

*Aug 24 09:38:14.343:   DHCPD: htype 1 chaddr ca02.1780.0006

*Aug 24 09:38:14.343:   DHCPD: remote id 020a0000c0a8b50110000000

*Aug 24 09:38:14.343:   DHCPD: circuit id 00000000

*Aug 24 09:38:14.343: DHCPD: DHCPDISCOVER received from client 0063.6973.636f.2d63.6130.322e.3137.3830.2e30.3030.362d.4661.302f.31 on interface FastEthernet1/0.

*Aug 24 09:38:14.343: DHCPD: Seeing if there is an internally specified pool class:

*Aug 24 09:38:14.347:   DHCPD: htype 1 chaddr ca02.1780.0006

*Aug 24 09:38:14.347:   DHCPD: remote id 020a0000c0a8b50110000000

*Aug 24 09:38:14.347:   DHCPD: circuit id 00000000

*Aug 24 09:38:14.347: DHCPD: Allocate an address without class information (192.168.181.0)

*Aug 24 09:38:16.347: DHCPD: Adding binding to radix tree (192.168.181.2)

*Aug 24 09:38:16.347: DHCPD: Adding binding to hash tree

*Aug 24 09:38:16.347: DHCPD: assigned IP address 192.168.181.2 to client 0063.6973.636f.2d63.6130.322e.3137.3830.2e30.3030.362d.4661.302f.31.

DHCP#sh ip dhcp binding

Bindings from all pools not associated with VRF:

IP address          Client-ID/              Lease expiration        Type

                    Hardware address/

                    User name

192.168.180.2       0063.6973.636f.2d63.    Aug 25 2011 09:36 AM    Automatic

                    6130.312e.3162.6538.

                    2e30.3030.382d.4661.

                    302f.30

192.168.181.2       0063.6973.636f.2d63.    Aug 25 2011 09:38 AM    Automatic

                    6130.322e.3137.3830.

                    2e30.3030.362d.4661.

                    302f.31

DHCP#sh ip int bri | ex una

Interface                  IP-Address      OK? Method Status                Protocol

FastEthernet0/0            192.168.180.1   YES manual up                    up     

FastEthernet1/0            192.168.181.1   YES manual up                    up  

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ignaciobajo
Level 1
Level 1
In response to Edison Ortiz

‎08-31-2011 08:35 AM

All ok

Thank you

Best Regards

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