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Questions tagged [arp]

Address Resolution Protocol is a layer 2 networking protocol used for resolving layer 3 addresses (such as IP addresses) into layer 2 addresses (such as Ethernet MACs). It is used by network devices when communicating with devices on the same layer 2 network.

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Default gateway and ARP confusion

I have the following configuration (I'd post a pic but not enough rep for more than 2): PC1 (10.0.2.10/24) and PC2 (10.0.2.137/29) are connected to a hub, which is connected to a router on interface FastEthernet0/1 (10.0.2.138/24). I ran two tests…
Gerk
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How to discover devices other subnet

Printers like some thermal I have tried Bixolon and samsung laser printer ,even mikrotik router have a tool where they discover the device via its mac address.No matter what the ip is. And they discover it fast within seconds. How is this done ? So…
GorillaApe
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How to resolve an IP address to hostname

This is my first time trying to work with an ARP so I'm slightly lost as to what I'm missing. I'm probably going down the wrong track, so lemme know if I'm completely and utterly off. What I'm trying to do: I'm trying to get one of my servers to…
Aram Papazian
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What network traffic when ethernet plugged in

So in a general sense (e.g. not windows, linux specific) what network traffic is generated when I first boot up/plug in a network cable. Basically: Detect DHCP server Pull an IP Address from DHCP ARP to detect default gateway's IP address What am…
Jamie
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arp "who-has tell" on cloned machine

I have a urgent problem to solve today, but I'm lost. Please help. I've cloned a Virtual Machine hosted on VM Ware ESXi 4.1 The OS is now Ubuntu Server 12.04 LTS, but at the time of cloning it was 10.04 LTS. I fixed the MAC address manually inside…
mcmorry
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Network ARP scanning for unknown ip address

Today, i did Wireshark network capture on a LAN, i've found a broadcast storm from a computer. The broadcast storm has stop but i would like to know why and what cause this broadcast storm. Here is the informations : The point is that there is no…
chaft
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Getting the MAC address of a remote host? Linux, macOS, Linux

I am writing a custom application in Go. My app needs to work on Linux, macOS, and Windows 10+. I need to verify that a remote host is what I think it is. I've tried arping and as expected, it does not cross routers. Is there any other way to get a…
PrecisionPete
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Why MetalLB cannot provide a real load balancing feature in layer 2 mode?

The documentation of MetalLB states that: In layer 2 mode, all traffic for a service IP goes to one node. To my understanding, this is mostly due to the fact that: one node assumes the responsibility of advertising a service to the local…
Dunatotatos
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Multiple ARP Spoofers on a network

We know that when an ARP spoofing process is running on a network, all of the network traffic will be routed through it before it travels to its true destination. But what happens if I have 2 ARP spoofing processes running on a network? My gut says…
Sander Smith
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Why is there flooding on L2 but not on L3?

Why is it, that on L2 (when there is no MAC Table entry for a new packet) there is MAC Flooding. But at the same time on L3 there is an ARP request (when there is no entry in the ARP table for a new packet) and no flooding?
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Prevent Linux server host from using ARP

If I know all client will connect to the sever with the same MAC address and to the same interface, is it possible to prevent from server host to send ARP request for each new client IP it gets a connection from? I tried to add permanent ARP entry…
jackhab
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Find out IP of connected interface?

Suppose I connect two machines directly together with an ethernet cable. I know nothing about machine2's configuration - I only have access to machine1. What can I do on machine1 to determine machine2's IP address? (Note that machine2 could have any…
Daniel
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Discover IP address of the device knowing only MAC address

While "wiresharking" the network, You may come across packets that looks like THIS eth.src to eth.dst (mainly colored white).. sometimes Wireshark recognize protocol LLC, NDP etc.. but sometimes it just 0x000 or 0x0de. So You know the MAC address of…
apech zzz
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First Reply on Ping is Unreachable the rest is okay

please check this weird ping i'm having What may have caused this problem
user4025978
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How does Bind IP to MAC work?

A client is connected to the network with a DHCP server, but also has a Bind IP to MAC entry in the router. What is the sequence of steps that determine the final client IP configuration given that (1) the client is configured to obtain IP from DHCP…
Jake
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