Questions tagged [arp]

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 does arp scanning cross the network layer?

I have the following setup in my network: cc:cc:cc:cc:cc:cc -------- 192.168.1.5/24 phone bb:bb:bb:bb:bb:bb (other networks and ...
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DHCP Reservations and ARP Binding

Is there any reason to not use DHCP Reservations and then add the same IP/MAC address combination in the IP-Mac binding in a TP-Link Archer router?
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Who does this IP belong to, possible spoofing attack?

I am currently using a TalkTalk router to access my home network. I've had issues previously with my connection being either slow or cutting out fully (not a common issue). I download XARP ...
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Correlation between DHCP and ARP

Can someone explain why there are so many ARP packets broadcasted from my client? And why is looking for my DHCP server?
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delete several permanent entries from arp table by command line

I am trying to remove the permanent entries from my arp table. but the following command only removes those that are not permanent ip -s -s neigh flush all With the arp utility I was able to ...
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ARP request doesn't reach the host

I have a fairly basic, local, wireless network. I have an Ubuntu media server/file share, a desktop PC, a laptop, mobiles and a TV. The issue I am facing since I got the server (for 2-3 months now) is ...
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arp can't resolve another Windows 10

I have more than 10 devices on the same subnet. On a Windows 10 Pro, arp can resolve every device's MAC except another Windows 10 Pro. On the other Windows 10 Pro, it is the same, ie its arp can ...
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Ethernet bridge for only one IPv4 subnet while isolating other IPv4 subets?

We have a growing robotics setup for which we need to improve the network configuration. The fact that is is a robotic setup is not important for the question itself, but it could IMO help ...
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Is there any way to display the all the device which are connected to the same gateway..?

When I was tried arp -a on windows 10 it is not showing all the devices, even after ping to gateway IP address.
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After adding a new device to home network, my chromebook is having connection issues

I have multiple devices connected to my Wi-Fi router (Archer C7 by TP-Link). I have never had trouble before going into my settings and now I cannot tell what I did wrong so that I can fix it without ...
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Learning MAC address of next hop without knowing IP address

Say we have a LAN - 5 hosts connected to a switch. I have not configured any IP address to any of the hosts. Can I communicate with another host machine by sending L2 traffic - L2 header and data ...
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How is it possible for ARP-entry to be removed at router for a device in active use?

Specifically, this applies to an Apple-Tv-3 over wifi. The Apple-Tv was in use from 9.15 to 11.00pm, all the time streaming from Youtube or some other service. The ARP-entry at the router for the ...
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QEMU/KVM/libvirt macvtap VEPA not working - ARP request not forward

Hi I've been struggling to get guest networking working when using a macvtap in VEPA mode between two VMs on a host. I've spent hours (days) googling with no joy. Does this network configuration ...
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Intel AC 9260/9560 sometimes not getting ARP responses from Linksys WRT54G running DD-WRT

Hello SuperUser StackExchange, I hope this is the right place to ask this and that my description of the problem can be understood: A friend of mine is having trouble with her wifi network. She's ...
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My pc sends 14000 arp requests in 5 minutes to a single pc on the network

I am currently checking my network traffic on my home network using wireshark. I have noticed that my pc is continuously arp requesting a pc on the network with 192.168.1.20 but like 14000 times in 5 ...
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No response to embedded system's ARP request after successful DHCP

I've been working to get UDP unicast packets implemented on an embedded system, using a Wiznet W5100S internet offload chip. Their libraries enable the negotiation of DHCP, and I have successfully ...
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Workaround for two devices with the same IP address on an airgapped network which is using an unmanaged switch where DHCP isn’t an option

So I have two IP cameras and a PC running Fedora 30 on a local network connected together using an unmanaged switch. The two IP cameras have the same IP address by default and for reasons I won’t go ...
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Only seeing default gateway in arp table and not dns server ip, why?

When I use the command ipconfig /all, I get the IP's of default gateway and DNS server. Then I connect to a website and use the arp -a command to view the arp table. On the table I only see the ...
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Trouble connecting to my neighbors NAS

I'm having trouble connecting to my neighbors NAS. We both live in the same student housing complex, and on the same hallway but for some reason i'm not able to connect using my rooms internet ...
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I have tried to ARP spoof my local LAN network but it won't forward and blocks the internet, is this because the router is blocking ARP packets?

I'm running the following python script in order to ARP spoof my network: #!/usr/bin/env python2 from scapy.all import * from os import system # Redacted the addresses victim = ["MY PC'S IP ADDRESS",...
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No ARP response if requested from another interface in same subnet

I have following setup: Host A (Manjaro) - connected to Host B via ethernet cable. Has ip address 192.168.0.155/24 assigned manually on interface enp3s0. Host B (Windows 10) - has ip address 192.168....
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Is there a way to identify which process starts an ARP Scan?

I have 2 machines in my network which regularly scans the whole network 192.168.1.0/24 by sending "Who has" packets targetting every ip. I've googled it, but I didn't find a way to know which process ...
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`arp -a` not showing all hosts after broadcast ping

I am accustomed to (most of the time) obtaining an ip address from a device on my network by first sending out a broadcast ping within the ip range of the network (eg, ping 192.168.0.255), then ...
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scapy Uses Wrong Sender MAC and IP Address for sr1()

My ARP request packet is sent from a thread running from a PyQt5 GUI app. When I Connect WiFi Launch the app Send the packet packet = ARP(op='who-has', pdst='192.168.1.1') packet.show() outputs: ###...
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Device on local network ARP poisoning

I've been dealing with this problem for a while. A device attached to my router with "Wistron Neweb Corporation" as its hostname ARP poisons the network every time it manages to get attached. At the ...
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Can't clear _gateway entry from ARP cache on linux

I have been able to clear all of the entries from my arp cache except one. I has the ip address _gateway and the MAC address is that of my router. I have tried "sudo arp -d _gateway", "sudo arp -a -d ...
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Roku works but is not apparently on our network?

We have two Roku devices in our house. Each is connected to a different TV's HDMI port and both work. They have unused RJ-11 ports, so I expect them to be on WiFi. But neither appears in the ...
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Iputils arping works good with ethernet devices but not with wifi devices

I am developing an application for an embedded device to check whether a particular network device present in the local network (192.168.1.1 - 192.168.1.254) is alive. Initially I was using ping to ...
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Is really NMAP uses ping packets to consider Host discovery?

I run this command nmap -sn 192.168.0.2 for only Host discovery. And then I started wireshark to see what will going to happen. I thought It would send ICMP echo req, but the results was very ...
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681 views

ARP Table multicast IPs

I ran arp -a in cmd in my home network and it got normal output, but then some multicast addresses have shown up: 192.168.3.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-...
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641 views

One IP address has multiple MAC addresses, how is this possible?

While looking for duplicate addresses with the following command, "arp-scan --timeout 1000 192.168.110.0/24", I discovered that the host I'm running this command on has multiple MAC addresses for the ...
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ARP static entry after shutdown

I used New-NetNeighbor to set an ARP static entry but it's gone after the PC is shutdown. Is there a way to make it persistent even when shutdown ? Thanks
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How to make OpenWRT work properly in GNS3

No matter what I try in GNS3 to get OpenWRT to run properly, I cannot get it to properly work with other GNS components. I can connect two devices through a switch and ping back and forth, but not to ...
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784 views

ARP cache MAC and Docker

When I run cat /proc/net/arp I see two entries* bound to : IP address HW type Flags HW address Mask Device 35.224.99.156 0x1 0x0 00:00:00:00:00:00 ...
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Are the packets meant to drop after IP spoof?

I was just experimenting ARP IP spoofing with a few virtual machines at home and did something like this. VM1 IP - 192.168.132.1 VM2 IP - 192.168.132.2 VM3 IP - 192.168.132.3 VM4 IP - 192.168.132.4 ...
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Bridged VirtualBox VM cannot ping LAN, duplicate IP for guest and host

Host: Windows 10 64-bit Guest: Ubuntu 16.04 32-bit Networking: Wireless. Home network. Host can ping Guest, and Guest can ping Host. Guest can also ping router. However, when I ping from my Guest ...
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FreeDOS does not answer ARP

I have 2 VirtualBox virtual machines with freeDOS (1.2) as guests, and I am trying to have network connection between them. For a start I am trying to have connectivity between one of the machines ...
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ARP incomplete on the router connected to the gateway

Here in my office we have a network consisting of the gateway (router) from the ISP, and less than 15 clients (computers). I noticed the network slowed down a lot, even when there was only 1 client ...
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Why does the 2nd ARP request wait until the pings are over to show up?

This problem was presented to me by one of my professors because it only happened after switching from 100Mb cards to Gigabit NICs. The second arp request that comes from the computer being pinged (to ...
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Wireless networked device not receiving packets

I'm using create_ap (based on hostapd) to use an old desktop Linux computer as a wireless router. This works fine for my Android smartphone, but not for my two Linux laptops. The connection will stop ...
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What is the default cache refresh rate of Windows 8 and Ubuntu?

0 down vote favorite Since sending an ARP request/reply for each IP data-gram is inefficient, hosts maintain a cache (ARP Cache)of current entries. The entries expire after What is the default ARP ...
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Is it normal to have a device on the home network broadcasting ARP all the IPs on the network?

I'm using Shark to scan my home network, and i noticed that a tablet is broadcasting, ARP protocol to all available IP on my network. Would this be a malicious attack from an app that i installed?
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Getting IP address of all device in local network , windows 7

There are multiple posts of this in many forums including this one, some of them involve using a third party app, and some involves using arp-scan or arpping tool in linux. I am trying to get an idea ...
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Is there a possibility to change protocol type in ARP packet?

I'm sniffing ARP packets in Wireshark and wondering what exactly means filed protocol type. The field is always 0x0800 for IPv4. Is it the same for IPv6? Is there a possibility to change the value ...
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WiFi Range Extenders, and Failing ARP requests

I'm working on a network, as outlined below - a BT HomeHub 5, and a Netgear EX6150 WiFi extender. There are other points on the network though I've left them out for brevity, and all of the pink ...
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How to debug an unstable connection in a P2P configuration

have a setup where I have two computers connected to each other (C1 and C2). Both have a static IP and they know each others IP. C2 sends UDP packets to C1 and C1 receives and logs them. Seems simple ...
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385 views

Force local network traffic through the switch

I have a machine with three network cards. One card is connected to a WAN and the other two cards are connected to the same switch with the same subnet (192.168.1.0/24). What I want to do is send data ...
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Why ARP Response only when network adapter in promiscuous mode?

In my home network (10.0.0.0/24) i want to deploy a network printer, without laying a cable from the switch to it. So i used a Raspberry Pi, that connects via Wifi to my wireless network and wired it'...
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In WLAN network, does ARP always show the mac address of device's Wi-Fi interface?

Say, if some device is accessing the server in the local network, while being connected to it via WiFi, would an ARP command sent from that server always show the same mac-address, as the device ...
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After some time has passed, no ARP requests from any device get an answer over Wi-Fi

I've been having this problem for years but only today I finally found a track to pursue the solution. Basically, in my house, whenever a device is connected to any of my WiFi networks, after some ...

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