1 VPS with 2 IP addresses. How to make them independent?

Douro · 10-27-2017, 07:11 AM

I have this in /etc/network/interfaces:

Code:

auto ens3
iface ens3 inet static

        address 46.xx.xxx.1x7
        netmask 255.255.252.0
        broadcast 46.38.xxx.255
        gateway 46.xx.xxx.1

auto ens3:0
iface ens3:0 inet static

    address 188.xx.xx.xx5
    netmask 255.255.255.255

I want the interfaces of my VPS to be independent. Without the traffic of ens3:0 interface pass by ens3 interface.
It's possible?

mabo1 · 10-27-2017, 07:35 AM

I setup a VPS recently with 2 IP addresses and the second address would not work untill I shutdown the VPS and started it again. A reboot did not work, need to shutdown and restart, give it a try...

That may sound strange but the recommendation came from my VPS service provider and it worked.

Douro · 10-27-2017, 07:43 AM

The IP's are working, both have access to the internet.
But the traffic done by the interface ens3:0 passes through the interface ens3, and that's what I did not want.
I wanted two independent interfaces.

mabo1 · 10-27-2017, 07:52 AM

Well your interfaces file looks about the same as mine, except that I have a debian system and interface names are different.

I recall from my research at that time it was important to ensure only one gateway which you have. It's late here but tomorrow I can check what I have in my interfaces file.

TenTenths · 10-27-2017, 08:17 AM

Contact your VPS provider. It's most likely that your VPS is provisioned with only a single virtual NIC and that this is your VPS providers prefered way of providing multiple IP addresses.

Douro · 10-27-2017, 09:42 AM

VPS already has two IPv4 assigned.
But with the current configuration the traffic off the interface ens3:0 passes through interface ens3.

TenTenths · 10-27-2017, 09:55 AM

Quote:

Originally Posted by Douro

VPS already has two IPv4 assigned.

Yes, you said.

Quote:

Originally Posted by Douro

But with the current configuration the traffic off the interface ens3:0 passes through interface ens3.

Yes, you said that too.

Just because you've two IPV4 addresses assigned doesn't mean your VPS has two virtual NICS assigned. From the information you've provided, where both IPs are being presented through the one virtual NIC, this appears to be the case.

Douro · 10-27-2017, 10:06 AM

Quote:

Just because you've two IPV4 addresses assigned doesn't mean your VPS has two virtual NICS assigned. From the information you've provided, where both IPs are being presented through the one virtual NIC, this appears to be the case.

... and how can I put those IP's in separate NICs?
Do I have to configure my "/etc /network/interfaces" file differently?

TenTenths · 10-27-2017, 10:12 AM

Quote:

Originally Posted by Douro

... and how can I put those IP's in separate NICs?
Do I have to configure my "/etc /network/interfaces" file differently?

Nobody here can tell you because you've not told us any useful information about the VPS.

Is this one you've set up yourself on your own host?

Is this one that you're paying for from a hosting provider?

If it's on your own host then on the host you'll need to assign another NIC to the virtual instance.

If it's from a hosting provider then you'll need to ask them to assign another NIC to it, and good luck with that as they'll most likely not be interested in providing you with a custom environment.

michaelk · 10-27-2017, 10:23 AM

What you have configured is called IP aliasing. It allows the same network interface to have more then one IP address. As stated you need two network interfaces and we need the answers to the above questions.

https://en.wikipedia.org/wiki/IP_aliasing

Douro · 10-27-2017, 10:44 AM

Quote:

If it's from a hosting provider then you'll need to ask them to assign another NIC to it, and good luck with that as they'll most likely not be interested in providing you with a custom environment.

I have sent a request for clarification to my hosting provider.

Douro · 10-29-2017, 10:23 AM

They want 35€ per month for another NIC!!

Douro · 10-29-2017, 10:24 AM

I verify that all data leaves the VPS normally by one of two IP's. As for the input, the data to reach the interface ens3:0 passes through the interface ens3.