Controller Based WLANs

wireless client unable to get ip address from Aruba controller on few DHCP scope

Aruba Employee
Issue wireless client unable to get ip address from Aruba controller on few DHCP scope
Environment Aruba DMZ Controller ( dhcp server) >> DMZ Switches >> AP125 Wired port >> Cisco Switch >> Cisco Aps and Controllers >> wireless clients

 

Clients on vlan 3108 DHCP scope unable to get an Ip address. However, clients are in vlan 3016 were able to get an IP address.

Cisco Controller vlan 3108 IP: 172.30.108.4
Cisco Controller vlan 3016 IP: 172.30.16.7

Aruba Controller vlan 3108 IP: 172.30.108.1
Aruba Controller vlan 3016 IP: 172.30.16.1

On the Aruba controller pcap, we observed that the Cisco controller (172.30.108.4) sent dhcp discover and  Aruba controller (172.30.108.1) didn’t response on vlan 3108 .However, the same controller sent dhcp offer on vlan 3016 (172.30.16.1 on controller). ( in filter1.pcap in attached log)

show ip interface brief  
 
 
Interface                   IP Address / IP Netmask        Admin   Protocol
vlan 1                      unassigned / unassigned        down    down
vlan 70                  144.5.148.137 / 255.255.255.224   up      up  
vlan 71                  144.5.132.197 / 255.255.255.248   up      up  
vlan 3016                  172.30.16.1 / 255.255.248.0     up      up  
vlan 3080                  172.30.80.1 / 255.255.254.0     up      up  
vlan 3088                  172.30.88.1 / 255.255.254.0     up      up  
vlan 3104                 172.30.104.1 / 255.255.254.0     up      up  
vlan 3072                  172.30.72.1 / 255.255.255.0     up      up  
vlan 3108                 172.30.108.1 / 255.255.254.0     up      up  
vlan 3068                  172.30.68.1 / 255.255.255.0     up      up 
loopback                 144.5.148.136 / 255.255.255.255   up      up  
mgmt                        unassigned / unassigned        up      down
tunnel 3004                 unassigned / unassigned        up      up  
tunnel 3112                 unassigned / unassigned        up      up

Observation:
=========
 
“show ip dhcp database”  show no “range” for 3108 vlan pool  however for 3016 vlan pool , it has “range” of IP address.
 
# vlan3108_BK5060_Mobility
 
subnet 172.30.108.0 netmask 255.255.254.0 {
 
                default-lease-time 3600;
 
                max-lease-time 3600;
 
                option domain-name "c.mobility.net";
 
                option vendor-class-identifier  "ArubaAP";
 
                option vendor-encapsulated-options  "144.5.148.136";
 
                option domain-name-servers 204.117.214.10, 199.2.252.10;
 
                option routers 172.30.108.1;
 
                authoritative;
 
 
# vlan3016_CHVPK_Mobility
 
subnet 172.30.16.0 netmask 255.255.248.0 {
 
                default-lease-time 86400;
 
                max-lease-time 86400;
 
                option domain-name "c.mobility.net";
 
                option vendor-class-identifier  "ArubaAP";
 
                option vendor-encapsulated-options  "144.5.148.136";
 
                option domain-name-servers 204.117.214.10, 199.2.252.10;
 
                option routers 172.30.16.1;
 
                range 172.30.16.16 172.30.23.254;  <=====================
 
                authoritative;

# vlan3068_CARVE
 
subnet 172.30.68.0 netmask 255.255.255.0 {
 
default-lease-time 86400;
 
max-lease-time 86400;
 
option domain-name "c,guest.net";
 
option vendor-class-identifier  "ArubaAP";
 
option vendor-encapsulated-options  "144.5.148.136";
 
option domain-name-servers 204.117.214.10, 199.2.252.10;
 
option routers 172.30.68.1;
 
authoritative;


We made the below changes but no luck.

1.Removed 3108 vlan pool , waited for 5 min and created it again.
2.Restart the dhcpdwrap process 
3.Delete the /flash/dhcpd.lease 

We observed that there was misconfiguration while excluding the IP address.

ip dhcp excluded-address 172.30.68.1 172.60.68.15 <=========================
ip dhcp excluded-address 172.30.108.1 172.30.108.15

ip dhcp excluded-address 172.30.16.1 172.30.16.15

We changed the “ ip dhcp excluded-address 172.30.68.1 172.60.68.15” to “ ip dhcp excluded-address 172.30.68.1 172.30.68.15” and the clients were able to get an Ip address from Vlan 3108.

 

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Revision #:
1 of 1
Last update:
‎07-10-2014 03:00 PM
 
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