Can two interfaces have the same IP address?

Can two interfaces have the same IP address?

You cannot use the same IP address on multiple interfaces. It just won’t work properly (usually it will only work on the last interface the IP was assigned on). You need to put the ethernet interfaces into a bridge and assign the IP address on the bridge itself.

Can two network interfaces have the same IP address why or why not?

You won’t “give both ports the same IP address” since there will only be one “port” visible to give an IP address to. Each “LAN port”, or NIC, must have a unique IP address. It would be unusual for each of the IPs to be on the same network. The same DNS server could serve both IPs, and usually does.

Why might two users appear to some website as having the same IP address even though they’re each actually configured with a different IP address?

Answer: If you access the Internet from a local network (LAN) in your home or business, it is possible that you share an IP address with other users. This is because, while you might use different computers or devices, you all use the same Internet connection.

Why do I have more than one IP address?

Using different IP addresses segmented based on particular mail streams is another legitimate reason for using multiple IP addresses. Since each IP address maintains its own deliverability reputation, segmenting each mail stream by IP address keeps the reputation of each mail stream separate.

Can two network interfaces have the same MAC address?

No. A MAC address is an address of a unique NIC on the network, and each MAC address will only appear once in a switch’s MAC address table. If a there are more than one NICs on the same LAN that share the same MAC address, it will cause all sorts of communication issues.

Can you have two IP addresses on the same subnet?

I recently ran into a situation where I needed two IP addresses on the same subnet assigned to one Linux host so that we could run two SSL/TLS sites. My first approach was to use IP aliasing, e.g. using eth0:0, eth0:1, etc, but our network admins have some fairly strict settings in place for security that squashed this idea:

Why are two network interfaces on the same subnet?

But then the problem came in: the network admins could see (on the switch) the ARP entry for both interfaces, but only the first network interface that I brought up would respond to pings or any sort of TCP or UDP traffic. After lots of digging and poking, here’s what I came up with.

Can a virtual machine have two network interfaces?

Thankfully this Linux system is a virtual machine, so I was able to easily add a second network interface (without rebooting, I might add – pretty cool). A few keystrokes later I had two network interfaces up and running and both pulled IP addresses from DHCP.

Why are the IPS on each interface the same?

If the ARP table is empty, the routing table tells it to send an ARP request on the respective interface, therefore they MUST have unique IPs or the server will only be able to speak to the last route added. You can set your DHCP server to assign IPs based on the hardware addresses or run a separate dynamic DHCP range on each interface.