WOW Thanks!! If we were running a box of VPS's and the box had two
NICs
would the second NIC be redundant just in case the 1st NIC fails....
How
do multiple NICs on the same box work?
OK so the software layer on the O/S talks to the NIC but is not
actually
assigned to any particular NIC?
Thanks for all the replies, this is very educational.
On 2022-04-20 09:19, Kevin Fries wrote:
Always remember, the network interface from the OS side and the
network interface from the hardware side are two completely
different
concepts. Other than the fact that they are generally matched one
to
one, they really have nothing to do with one another.
A hardware interface (i.e. on a NIC) is physical, and you have as
many
as you have. No way to manufacture more without installing more
hardware.
A OS network interface is a software construct. ETH0 (using the
old
vernacular) generally maps to the first hardware interface, and
provides a hook for software to use… most notably the network
stack.
While it is not done out of the box, there is no restriction to
say
that two of these constructs can not map to the same back end
construct. So yes, you can have ETH0.1 (again, using the old
vernacular)
VMWare and other similar virtual machine managers can take
advantage of
this.
The second point you need to get straight in your head is that a
fixed
IP address is never a construct of the box, but of the Domain
Naming
Service (DNS) on the network. It is NAMED that assigns the IP
address. For an interface (software in this case as the
hardware’s
address is actually the MAC ADDRESS) to have an address, it asks
the
DHCP server for it. If the DHCP has been told, always assign this
address to this requester, the address is a fixed, reserved, or
dedicated IP depending on who is speaking to you. They all mean
the
Same thing.
So, yes, the number of NICs on a box does not limit the number of
network interfaces the OS provides, and yes, each of those
interfaces
can have a dynamic or dedicated IP address.
HTH
Kevin
Sent from my iPad
On Apr 20, 2022, at 9:51 AM, Keith Smith via PLUG-discuss
<[email protected]> wrote:
Hi,
I'm wondering how VPS servers are configured. I have a VPS with
a
dedicated IP. I assume I share a box that has a number of
virtual
machines and I assume each VPS has a dedicated IP.
This is a hardware question. I assume the box has at least 2
network
cards. So lets say the server has 20 VPS on it and each has a
dedicated IP. Does the box need a NIC for each IP or does the box
have
NIC cards that can service/route multiple IPs?
I have a Dell consumer grade mini tower computer with a single
NIC
which is built into the motherboard. I assume that NIC can only
service one IP address, is that correct or can I install
virtualization software on this computer and use the NIC for
multiple
IP's?
Did I just open a can of worms?
Thanks in advance for your wisdom.
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