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Questions tagged [arp]

ARP is a protocol for resolution of network layer addresses such as IP into link layer addresses (such as MAC addresses). "arp" is also a command in Linux and Windows to manipulate the ARP cache.

Address Resolution Protocol (ARP) is a telecommunications protocol used for resolution of network layer addresses into link layer addresses, a critical function in multiple-access networks. ARP was defined by RFC826 in 1982.
It is also the name of the program for manipulating these addresses in most operating systems.

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How to Capture the ARP Table and output to a file in Powershell

I have been having issues finding an answer to this question. SO I figured I would share what I have built with the masses. What I was trying to do was run the ARP -a command and capture the results to use in a TXT file for something else later.…
Ross G
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Why my arp table always only has router's information?

I have a question that my ubuntu's arp table always has one device (router) except I ping other devices, the arp table will be update. But I don't know what the mechanism of arp table updating. Could someone explain the mechanism? Thank you.
Babau_Ho
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Ping not working?

I read from a book, says that two computer A and B: A: 192.168.26.129/24 gateway 192.168.26.2 B: 192.168.26.3/27 gateway 192.168.26.2 The book say that if B ping A, it can works. i. So I test it on cisco packet tracker, and it's not working? ii. …
green2rabbit
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ARP replies (Unicast) not seen in Wireshark, any ideas?

[I had to repost this from the ask.wireshark.org as my questions do not come up there, still not sure why]. Hi All, I'll try my luck here. I'm trying to solve a similar problem to the one described in "how to work around unicast messages" question,…
tum_
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Registration manual MAC Address

arp ether –i eth0 -s 10.252.108.143 00:24:e8:08:a2:ad ether:unknow host what sould I do? please help me
M. Syafi'i Asy'ari
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list of connected mac addresses through wifi

I really need help for a android program. Please can anybody tell me anyway in which i could get the list of connected mac addresses through wifi. I already tried arp but it gives false results if the arp file is't refreshed
Milind Chaudhary
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Applications of broadcast packets?

Like arp ( to resolve destination), are there any other application where we are using broadcast packet messages. If possible give some reference links too.
guru th
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Is it possible to connect several servers with identical IP addresses and manually manage the ARP cache in order to communicate with them?

Let's say I want to perform automated setup on several servers at the same time. So I connect 10 servers to my network at the same time, each one comes with a default IP of 192.168.1.1 but I have the list of each of their MAC addresses. Now if I…
user2163300
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AttributeError: 'NoneType' object has no attribute 'groups'

I don't know how I should ask this question. If I make any mistakes, I would appreciate it if someone could correct them. I am writing a program in python on Ubuntu. In that program I am struggling to get Mac address of remote machine from its IP…
Irfan Ghaffar7
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How do you find keys that have duplicate values in a python dictonary?

I have a dictionary with an IP address as the key and mac address as the value. One entry might look like this: ip_dict['192.168.1.100'] = '33:22:11' This dictionary is populated by reading the output of an arp table. What I am looking for is an…
Robert Pinsky
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Why the error happened in Objective-C

I am new to IOS develop. And I want to turn on the Hotspot via UI Setting , and get the IP address and MAC address of client which connected to this Hotspot via objective-c. I reference the link forHow do I query the ARP table on iPhone? The code is…
Martin
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Linux - No buffer space available - what's this mean, how can I determine available space, and how can I stop it using up space?

I'm using perl raw sockets to send a large number of arbitrary raw packets (nothing malicious!), but I only get about 14500 going out before my send() call fails with "No buffer space available". I'm guessing that something in the kernel is keeping…
cnd
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List of connections of a NIC card in C#

I have two network interface cards installed in my system, I want the list of all the computers that are connected to a particular NIC card or I need a code that will work similar to "arp -a" command in DOS. I need a C# code to do this. Please help…
user2480219
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c programming put a hexa into char

I have unsigned char src_mac[6]; that holds values with the %02x format.For example to find the value in src_mac[0] i do: printf("%02x\n",src_mac[0]); I want to know how to put values in src_mac(I need to put a mac adress saved as a…
Emil Grigore
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Pinging using ARP always return host offline

I'm trying to check if computer on the net is online by using code which supposedly to check it by using ARP packets. I am always getting message that host is offline even when I'm sure that it's online. I have checked on my localhost IP and on some…
HelpNeeder
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