| 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.