topic Re: Where is this IP address coming from? in ONTAP Discussions

Where is this IP address coming from?

Stormont — Wed, 04 Jun 2025 13:55:06 GMT

I opened a support case about this, but it just keeps going around in circles.

I recently attempted to download an OnTap update from our internal HTTP server for our AFF8040, and the address that the NetApp was coming in as is 172.22.19.23 which isn't assigned to anything that I can find on the filer. (The same exact thing is happening on our other cluster in a different data center with different IPs)

On the filer, e0M has a MAC address of “00:a0:98:a2:2f:b3”

Oriole::> network port show -node Oriole-01 -port e0M

Node: Oriole-01

Port: e0M

Link: up

MTU: 1500

Auto-Negotiation Administrative: true

Auto-Negotiation Operational: true

Duplex Mode Administrative: auto

Duplex Mode Operational: full

Speed Administrative: auto

Speed Operational: 1000

Flow Control Administrative: full

Flow Control Operational: full

MAC Address: 00:a0:98:a2:2f:b3

On the switch, there are a number of ARP entries all related to that MAC address on Port 2:11.

Destination Mac Age Static VLAN VID Port

172.22.16.5 00:a0:98:a2:2f:b3 7 NO Internal_Appliances 16 2:11

172.22.16.7 00:a0:98:a2:2f:b3 4 NO Internal_Appliances 16 2:11

172.22.19.23 00:a0:98:a2:2f:b3 1 NO Internal_Appliances 16 2:11

The first two addresses as statically assigned on the filer:

Oriole::> network interface show

Logical Status Network Current Current Is

Vserver Interface Admin/Oper Address/Mask Node Port Home

----------- ---------- ---------- ------------------ ------------- ------- ----

Oriole

Oriole-01_mgmt up/up 172.22.16.5/20 Oriole-01 e0M true

cluster_mgmt up/up 172.22.16.7/20 Oriole-01 e0M true

172.22.19.23 is clearly being sent by something on the NetApp side as that address is shown to have the same MAC address as 172.22.16.5, 172.22.16.7 (both of those IPs are assigned to e0m) but what is it?

Re: Where is this IP address coming from?

rhparkgit — Fri, 16 Mar 2018 08:20:37 GMT

Did you upgrade to ONTAP 9.3?

I guess that problem Bug ID#1142938

Bug Detail

Bug ID	1142938
Title	The DHCP IP address for the e0M interface is not removed after installing ONTAP 9.3
Duplicate of
Bug Severity	2 - System barely usable
Bug Status	Not Fixed
Product	Data ONTAP
Bug Type	Unknown
Description Formatted	When you perform a fresh installation of ONTAP 9.3, and the boot environment variable "bootarg.init.dhcp.disableb is either undefined or set to "false", the e0M management interface attempts to automatically obtain an IP address during the boot process. As a result, if the storage system can access a Dynamic Host Confiuration Protocol (DHCP) server, the system obtains an additional IP address for the e0M interface. This DHCP IP address might be removed during the cluster setup process when configuring a static IP address. However, DHCP requests to obtain IP addresses continue at every reboot and the DHCP IP address might again be configured on the e0M interface when the reboot process completes. The DHCP-assigned IP address remains active on the e0M interface until you set the "bootarg.init.dhcp.disableb variable to "true" and the system is rebooted.
Workaround Formatted	Contact technical support for assistance.
Notes Formatted	None
Fixed-In Version	A complete list of releases where this bug is fixed is available here.
Related Bugs

Re: Where is this IP address coming from?

Stormont — Fri, 16 Mar 2018 12:19:23 GMT

That is exactly what the problem is. We upgraded from 9.2 P1 to 9.3 P1. I will keep waiting for a fix. Thanks!