ARP (Address Resolution Protocol) is a protocol used to find an address from the link layer (Ethernet, for example) from the network layer address (such as an IP address).

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How do I remove an entry from IP address resolution?

On OS X, I am swapping devices using Thunderbolt Ethernet and often find that I'm unable to connect for some time to newly added devices. The cause seems to be that the interface (I apologize if I ...
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52 views

Why can't I ping while I can see in ARP?

There are several questions asked the same way; I have been trying various solutions for 3 days with no luck; that's why I am asking from scratch. I have a wireless router and a wireless access point ...
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Is there a way to execute an arp spoof on Windows?

You can easily set up arp spoofs on linux using the arpspoof command in terminal. My question is - is there a piece of software that would allow you to do the same on Windows? So far I've seen ...
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ARP table on sg500x-48 not showing everything

I have a sg500x-48 Cisco switch with 15 different machines/IP addresses connected to it. Nevertheless, ARP table shows only one entry, regardless of if I run 'show arp' through ssh or use WebGUI. ...
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45 views

How to find the no of machines/IPaddress connected to same network?

I am connected to WiFi named: santosh in my home. I am looking for any command in unix or windows command prompt to check which all machines or IP address are connected to the same networks i.e. on ...
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92 views

Multicast Entries in Arp Table

So, I recently ran the arp -a command on my primary windows machine and noticed that there were a ton of multicast class-d addresses listed in my arp table. I do not remember seeing so many ...
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230 views

is there any way to enable telnet/ssh session into a Netgear CG3700EMR

I want to enable Wake on Wan (Wol from internet) with my router, but i have no chance to modify arp table in order to specify a fake address which could receive this broadcast packet. So, is there ...
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46 views

Invalid ARP received from GS724Tv4 ProSafe 24-port Gigabit Ethernet Smart Switch

The switch is configured with four ports (ports 9 - 12) for VLAN 114. Port 24 is configured as a trunk port used for uplink to a router. VLAN Status 114 B5-K05 VLAN 114 Static g9 - g12, g23 - ...
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What is the difference between ARP binding and DHCP address reservation?

In my TL-WR1043ND I have these functionalities and both of them pair an IP address to a MAC address. What is the difference? I red that the ARP one is there for security reasons, others say it is for ...
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Get IPv6 address of an IPv4 machine?

Given two machines on a local network, both connected via IPv4 and IPv6, can machine A get the IPv6 of machine B if it has machine B's IPv4 address? I presume the ARP cache should be able to provide ...
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1answer
79 views

Is my arp cache poisoned?

I have these entries, starting with 224 on my computer and on the virtual machines, they cannot be deleted nor modified. Why is that happening. I am running Win 8.1 C:\WINDOWS\system32>arp -a ...
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30 views

Accessing device in my subnet with a fixed IP

I've just purchased a cheap surveillance camera for my apartment. However, while the subnet in my apartment is 10.0.0.0/24, the camera comes with a fixed IP of 192.168.1.10. You can change the IP, but ...
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31 views

Ubuntu intermittent network connection, ARP-related

Sorry if the title is too vague, but I cannot pin-point the real problem so hard to phrase it. Here's the description. Computer A, connected to enterprise network using Windows OS, working fine. But ...
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25 views

ARP is showing same physical address for different IPs

At home, I'm using WiFi to connect most devices with each other. My workstation does not have a WiFi adapter built-in, so I connected it via Ethernet to a WiFi router running OpenWRT in DHCP client ...
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3answers
254 views

Is it possible to build a fully functional LAN without any router, only with a switch?

I have used Link Local protocol several times but only to link two computers or a computer and another device to transfer files via FTP. But does Link Local protocol work for multiple hosts. Let's ...
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2answers
54 views

Can ARP cache poisoning be done from WAN side of home router?

Is it possible to initiate ARP cache poisoning attack by spoofing the ARP requests from WAN side of router? instead of attacking from LAN Side?
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77 views

How to discover devices on LAN

I want to learn how to discover all the devices on LAN using Linux Terminal. I know how to ping the specific ip address, but I'd like to learn a way that doesn't force me to ping from .1 to .255 in ...
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4answers
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Why do we need IP addresses to communicate within the local network segment?

Because MAC addresses are only usable across the local network segment, we use IP addresses to communicate with other segments via routers. Meanwhile, for local targets, ARP is used to translate IPs ...
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93 views

Arp Address Mismatch

Whenever my friend tries to connect to my network his router logs "Arp address mismatch - Ethernet source address doesn't match ARP sender address" and refuses the connection. It happens when he tries ...
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Windows guests do not recive local MACs

We are running a KVM based virtual machines. The network type is bridged network. The KVM host is Debian 7, that is run as VMWare esxi virtual machine. In other words, Debian 7 (KVM host) is run as ...
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26 views

weird arp reply behavior

I implemented a program with python so i can discover if a certain machine is sniffing in my network. Lets suppose that the machine that i wan't to know if it is sniffing has the IP address 192.168....
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1k views

How to get device name from scan like nmap on Linux

I know that I can use a tool like NMAP or arp-scan on Linux to identify the IP and MAC addresses of all devices on my local network. I also know that arp-scan will do a MAC address lookup to get the ...
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83 views

ESX 6 and Linux 3.x arp fail in back 2 back link

we are having a strange problem with back 2 back connection between an ESX 6 and CentOS 7 machine. Hoping to find a solution on stackoverflow The story is below: - we are using a CentOS 7 directly ...
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246 views

Finding IP Address from MAC of a device in a different subnet

I am new to networking as such, but I have been searching a lot about the problem of finding IP from MAC for the past couple of days. I have a device whose MAC address I know and I have an Android app ...
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Working around IP Conflicts with ARP meddling or custom TCP/IP stack

Slightly interesting conundrum, I have a network of 15-20 embedded devices that are effectively hard coded with the same static IP address, but they all have different MAC ID's. I need to address ...
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Does the order of entries in the routing table matter?

Does the routing order matter: > route -n Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use Iface 123.x.x.151 0.0.0.0 255.255.255.255 UH ...
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1answer
77 views

Setting up static IP for virtualbox

I was learning arpspoofing.I was using my Ubuntu machine as the Man in the middle, an Ubuntu in my virtualbox as the target and my default gateway(Which is 10.7.1.2) as the target gateway. In order to ...
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160 views

Why does an IP on a dummy interface answer to an ARP request on eth0

I've brought up a dummy interface on my (Ubuntu 15.10) laptop with an ip address of 10.0.3.144, netmask 255.255.255.255 I have a USB -> Ethernet adaptor. When plugged in this is configured to ...
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101 views

IP packet forwarding from Kali VM to router

Versions: Host OS: Windows 10 Virtual box: 5.0.10 r104061 VM: Kali Linux 2.0.0 Victim machine: My laptop (I will add info about it if needed) Networking: Host IP: 192.168.1.6 VM IP: 192.168.1.12 ...
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241 views

VMWare NAT not populating ARP with IP/MAC from VMWare host only?

I ran into a problem while penetration testing with Netdiscover on a virtual set up using VMPlayer, free version. The attack machine is on the VMWare NAT network interface, and the target machines ...
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167 views

Why is Linux machine sending ARP request for an IP on a different subnet?

We have a linux machine, on the 192.168.2.0/24 subnet sending arp requests when we try to connect to a machine on the 192.168.5.0/24 network. (The arp requests are for the machine at 192.168.5.10, not ...
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why doesn't system do ARP request broadcast before sending an IP packet?

First, let me describe the problem briefly. I have two programs which send IP packets from a host(192.168.0.101) to another host(192.168.0.106). These two programs are written respectively with C and ...
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61 views

Using arp-scan in ubuntu and kali

I am currently using Ubuntu 15.04 and I have installed arp-scan with apt-get. If I run it I get a list of machines with their IP addresses, MAC addresses and about half of them say the make, others ...
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75 views

Testing ARP poisoning in VBox NAT network

I wanted to test ARP poisoning in a VBox NAT Network environment. I currently have 2 VM in the NAT network: a Kali Linux VM (IP 10.0.2.15) and a victim Ubuntu VM (IP 10.0.2.4) The other victim is ...
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610 views

PC sends repeated ARP requests to Default Gateway

CONTEXT: My machine, for whatever reason, is flooding the network with ARP requests. A downstream switch sees this as malicious and cuts my connection. I've narrowed it down to one of the dozen or ...
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44 views

How to make server answer for who has ARP request not directed to its ip (answer also for different ip)

I have a computer with Fedora, a board running RTEMS and an adapter from ethernet to RS232-RS485. All of them are connected through an ethernet hub, I want to establish a connection between the board ...
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59 views

How to send ARP - Who has - request from mac

I have some network issue between my 2015 Macbook pro and my Virgin Media Superhub 2. If my theory is right, I would be able to solve it, by sending ARP requests to my router every few seconds. ( Now ...
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58 views

detecting the router's ip address using arp command

When I use the command arp -a I get the list of IPs in my network. the first IP address after the address of my own pc (that I run command) is the IP address of the router. I want to know is the ...
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161 views

Windows 8.1 cannot connect to one specific device on LAN

I just changed out an old Linksys WRT54GS wireless router for a TP-Link TL-WR841N wireless router. I immediately flashed the router to use DD-WRT. Everything went seamlessly except that my Windows 8....
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Why is ARP replaced by NDP in IPv6?

ARP was replaced by the NDP (Neighbour Discovery Protocol). But I don't know the exact reason for this. Are there any security issues in ARP? Why ARP is replaced by NDP? What are the advantages of ...
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transfer ARP on linux iptables with diffrent subnet

Firewall(linux) - with 2 interfaces: internal, external ; also used as GW Internal: 192.168.254.1/16 External: 10.0.254.1/16 external_client(linux) IP: 10.0.1.1/16 internal_client(linux) IP: 192.168.1....
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224 views

Cannot delete entry from ARP cache

A picture's worth a thousand words: I'm running in an Administrator command prompt and trying to delete an invalid ARP entry. It fails with no error or explanation. Where do I go from here?
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1answer
254 views

Can we block ARP requests in wan router

Can we block ARP requests in wan router .I cannot send ARP requests to anyone I think my isp blocked it. I cant connect to other nodes in the lan. when I inspected flow of packets using wireshark. I ...
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3answers
843 views

How to manually send an ARP request

I recently sniffed with Tcpdump a packet "ARP, Request who-has 192.168.2.3 tell 192.168.2.2, length 28". I would like to reproduce this message, and to send an ARP request from my laptop to any IP I ...
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Layer2/3 ISO - Explain how layer 3 works

I'm confused to how a local network communicates. To my current understanding, all the computers communicate by using mac addresses (to talk to the NIC). Does this mean if the computer knows the mac ...
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191 views

Trouble resolving hostnames with arp -a

I'm trying to lookup hostnames of computers on the same network as me. Sometimes when I use arp -a I get a question mark (?) for the hostname. I've tried using nslookup xx.xx.xx.xx and host xx.xx.xx....
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Prevent ARP spoofing in AP, “wl deauthenticate” command

I am in a situation where I cannot do MAC filtering in an AP and I need to block a user that is ARP spoofing the network. I am trying to use the command wl deauthenticate to kick the client. And I ...
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1answer
2k views

How to set up a static/persistent ARP entry with OpenWRT 14.07, Barrier Breaker?

The title say it all, but here is the long version: I am trying to setup a way for my home server to automatically turn on using WakeOnLan, when a client tries to access it. My idea is that the ...
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701 views

What causes dropping of ARP response packets in a wireless network?

I have a network of wireless access points (APs) in my local area network (LAN). Some PCs in the network can get ping responses from some other PCs/devices in the network but not some others. I have ...
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withdraw MAC address assignment

Is it possible to un-claim ownership of a MAC address via special kinds of gratuitous ARP or possibly by sending ARP packets with special addresses (e.g. 00:00:00:00:00:00) to invalidate cache table ...