Two IP Addresses Configured?

[AllianceDoug]

When I log in to the FreePBX Linux console, it shows the server has two IP addresses - x.x.x.2 and x.x.x.20. As far as I understand, everything is using the x.x.x.2. Router ports are forwarded to x.x.x.2.

Is this an issue? If so, how do I remove the x.x.x.20 IP address?

The System Admin only shows one address:

It is not a WiFi address:

There is a response when I ping x.x.x.20 from my PC. But I don’t know exactly what is responding.

We do have an ongoing issue where our SIP provider endpoints are constantly going Reachable/Unreachable/Reachable/Unreachable. So I’m going through everything I can think of and came across this. We don’t need to try and troubleshoot that issue here, unless you think they might be connected.

Thanks.

[arielgrin]

By default you should have only one IP on the interface. Maybe you have assigned two IPs? Check the ifcfg script for your eth0 located on /etc/sysconfig/network-scripts/ifcfg-eth0

[AllianceDoug]

@arielgrin

Check the ifcfg script for your eth0 located on /etc/sysconfig/network-scripts/ifcfg-eth0

Here is what I get for ifcfg-eth0:

Here is what I get for ifcfg-eth1:

Any thoughts about this? Thanks.

[dicko]

Check what is shown by

ls -l /etc/sysconfig/network-scripts/ifcfg*

maybe you have a vlan setup or some other network on eth0

[AllianceDoug]

@dicko

Check what is shown by

ls -l /etc/sysconfig/network-scripts/ifcfg*

maybe you have a vlan setup or some other network on eth0

Here is that result:

The whole switch serving all phones and the FreePBX server are on a VLAN given by the gateway/router:

Any ideas with that? Thanks.

[arielgrin]

Your issue is that ifcfg-eth1 has DEVICE=eth0 so in addition to the static IP defined in ifcfg-eth0, eth0 is also getting a dynamic IP through ifcfg-eth1

[AllianceDoug]

@arielgrin

Your issue is that ifcfg-eth1 has DEVICE=eth0 so in addition to the static IP defined in ifcfg-eth0, eth0 is also getting a dynamic IP through ifcfg-eth1

So does ifcfg-eth1 need to have “DEVICE=eth1” and “NAME=eth1”?
Or maybe would “ONBOOT=no” turn off eth1 so there is no conflict?

Thanks,

[AllianceDoug]

I have found this second x.x.x.20 IP address in the Firewall → Interfaces screen:

Does this look right?

[arielgrin]

Does your server have two NIC cards? If so, do you need both? If you only need eth0, set onboot=0 for eth1 but also make sure to set device=eth1. You need to fix the device parameter in any case.

[AllianceDoug]

Thanks for assisting.

The server actually has four Ethernet ports. We are only using one for this FreePBX server.

For eth1 in the ifcfg-eth1 file, I set the following:
NAME=eth1
DEVICE=eth1
ONBOOT=no

Now when I log in to the console it only shows the one server IP address, x.x.x.20 no longer responds to a ping, and the additional interface does not show up in Firewall -> Interfaces.

@arielgrin Thank you for the assistance!