Instant On - Wireless

Hello!

I have the following topology:

Mikrotik (as gateway and DHCP-server) -> HPE 1820 switch (as core) -> Aruba Instant On 1930 switch (as an access switch) -> APs (only AP22 in use)

I found out that some APs on Aruba Instant On portal are shown as disconnected. Ussualy 1-2 APs. When I looked in Mikrotik logs I found out that some APs constantly re-request an IP address using DHCP every 5 minutes (exactly 5 min, not a second earlier, not a second later). Mikrotik gives an address for 24 hours.

I have captured packets on Mikrotik and reallized, that such "problem" APs don't just re-requesting an address - they send DHCP-Release message to Mikrotik every 5 mins and then DHCP-Discover broadcast. Mikrotik gives them Offer, they answer with Request, Mikrotik gives ACK. And in 5 minutes everything is repeats.

When the behavior of an AP is as described above, it is shown as disconnected on Aruba Instant On portal.

What can I do to fix this? Why do some APs always release their IP-address every 5 min?

It's not what I see with my AP22.

Do you have MAC address reservations set up for the AP's.

Hello!

I have the following topology:

Mikrotik (as gateway and DHCP-server) -> HPE 1820 switch (as core) -> Aruba Instant On 1930 switch (as an access switch) -> APs (only AP22 in use)

I found out that some APs on Aruba Instant On portal are shown as disconnected. Ussualy 1-2 APs. When I looked in Mikrotik logs I found out that some APs constantly re-request an IP address using DHCP every 5 minutes (exactly 5 min, not a second earlier, not a second later). Mikrotik gives an address for 24 hours.

I have captured packets on Mikrotik and reallized, that such "problem" APs don't just re-requesting an address - they send DHCP-Release message to Mikrotik every 5 mins and then DHCP-Discover broadcast. Mikrotik gives them Offer, they answer with Request, Mikrotik gives ACK. And in 5 minutes everything is repeats.

When the behavior of an AP is as described above, it is shown as disconnected on Aruba Instant On portal.

What can I do to fix this? Why do some APs always release their IP-address every 5 min?

Hello!
If you mean static IP bindings to access point MAC addresses, then I don't have them. All access points receive dynamic addresses.

------------------------------
Oleg Ilenko

Original Message:
Sent: 09-04-2024 06:44 AM
From: Aruba K
Subject: AP22 disconnecting - DHCP-release issue

It's not what I see with my AP22.

Do you have MAC address reservations set up for the AP's.

------------------------------
Andy K

Original Message:
Sent: 09-03-2024 10:14 AM
From: ilenko
Subject: AP22 disconnecting - DHCP-release issue

Hello!

I have the following topology:

Mikrotik (as gateway and DHCP-server) -> HPE 1820 switch (as core) -> Aruba Instant On 1930 switch (as an access switch) -> APs (only AP22 in use)

I found out that some APs on Aruba Instant On portal are shown as disconnected. Ussualy 1-2 APs. When I looked in Mikrotik logs I found out that some APs constantly re-request an IP address using DHCP every 5 minutes (exactly 5 min, not a second earlier, not a second later). Mikrotik gives an address for 24 hours.

I have captured packets on Mikrotik and reallized, that such "problem" APs don't just re-requesting an address - they send DHCP-Release message to Mikrotik every 5 mins and then DHCP-Discover broadcast. Mikrotik gives them Offer, they answer with Request, Mikrotik gives ACK. And in 5 minutes everything is repeats.

When the behavior of an AP is as described above, it is shown as disconnected on Aruba Instant On portal.

What can I do to fix this? Why do some APs always release their IP-address every 5 min?

------------------------------
Oleg Ilenko
------------------------------

How full is your DHCP pool?

Anything infrastructure wise on DHCP should use the same IP IMO, it's just good practice.

------------------------------
Andy K

Original Message:
Sent: 09-04-2024 06:54 AM
From: ilenko
Subject: AP22 disconnecting - DHCP-release issue

Hello!
If you mean static IP bindings to access point MAC addresses, then I don't have them. All access points receive dynamic addresses.

------------------------------
Oleg Ilenko

Original Message:
Sent: 09-04-2024 06:44 AM
From: Aruba K
Subject: AP22 disconnecting - DHCP-release issue

It's not what I see with my AP22.

Do you have MAC address reservations set up for the AP's.

------------------------------
Andy K

Original Message:
Sent: 09-03-2024 10:14 AM
From: ilenko
Subject: AP22 disconnecting - DHCP-release issue

Hello!

I have the following topology:

Mikrotik (as gateway and DHCP-server) -> HPE 1820 switch (as core) -> Aruba Instant On 1930 switch (as an access switch) -> APs (only AP22 in use)

I found out that some APs on Aruba Instant On portal are shown as disconnected. Ussualy 1-2 APs. When I looked in Mikrotik logs I found out that some APs constantly re-request an IP address using DHCP every 5 minutes (exactly 5 min, not a second earlier, not a second later). Mikrotik gives an address for 24 hours.

I have captured packets on Mikrotik and reallized, that such "problem" APs don't just re-requesting an address - they send DHCP-Release message to Mikrotik every 5 mins and then DHCP-Discover broadcast. Mikrotik gives them Offer, they answer with Request, Mikrotik gives ACK. And in 5 minutes everything is repeats.

When the behavior of an AP is as described above, it is shown as disconnected on Aruba Instant On portal.

What can I do to fix this? Why do some APs always release their IP-address every 5 min?

------------------------------
Oleg Ilenko
------------------------------