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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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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Purpose of Address Resolution Protocol

I was wondering what the purpose of ARP is? If NAT allows us to have internal IP addresses to communicate with computers on the local network why do we need ARP?
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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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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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32 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 ...
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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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sniffing network traffic using arp spoofing

I am experimenting with some network sniffing tools. I like the idea of arp spoofing [explained here] but I have two questions: Does arp spoofing technique affect the speed of the connection of the ...
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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 ...
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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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ARP Entry Lookup for IP Range?

Is there a way to do a ARP lookup via windows console for an IP range? Eg: arp -a 192.168.10.0-254
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Duplicate IP address Telnet and ARP

I have 3 hosts (PC1, PC2, and PC3). I set the IP addresses for PC2 and PC3 to be 10.0.0.2 and PC3 to be 10.0.0.1. I telnet from PC1 to 10.0.0.2. I then am logged in to PC3. I can see in Wireshark that ...
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Is there a way to get “arp” to list devices on all subnets of a network?

I'm using arp -an on Mac OS X to list all devices on my network, but (as I understand it) this just lists devices on the same subnet. Is it possible to list all devices on the network and not just my ...
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Is there an easy way to do a host lookup by MAC address on a LAN?

Is there an easy way (on Linux) to implement host lookup by MAC address? In small local networks, it is easy to use for example arp-scan to find out the IP address of some device. I usually use ...
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What's the point in arp -g?

I typed arp into Windows CMD and it gave me the options as to what I can do with it. It gave me arp -a (then gave details) and then it showed arp -g which says 'same as -a' So what's the point of ...
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Network connection error. Data-link layer working. Static/DHCP ip assignment failing, with no connection

Trying to connect two virtual machines through a windows (host) tap adapter. One virtual machine is a pfsense router running on VirtualBox, the other an emulated rapsberry pi running raspbian on qemu. ...
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44 views

Why does traceroute show a direct connection to my home network devices instead of going via the router?

I have 2 laptops connected to my home router, with the IP addresses 192.168.1.10 and 192.168.1.11. I use traceroute 192.168.1.11 from the first laptop and I get 1 22 ms 11 ms 33 ms ...
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How to reverse arp using nping for Windows

I would like to send a reverse ARP to resolve an IP address given a MAC address using nping for Windows. The documentation is not clear on how this should work and I'm unable to find any examples ...
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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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157 views

Why am I not seeing ARP requests from my own machine in wireshark?

I am using Windows 7. I open up Wireshark and start a live capture with the filter: ip.src == THIS.IS.MY.IP I then go to a command line and do an arp -d * and ping a bunch of stuff. I see my ICMP ...
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Why can't I view the arp table on my VPS server?

I'm running CentOS Linux release 7.0.1406 on a VPS server. Attempted to use the "arp" command and found it was missing. I tried as root as well to make sure the command wasn't in sbin. Then I googled ...
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(Un)managed switches (R)ARP tables size?

The question in short : What is the address storage capacity of (un)managed switches nowadays ? Or does it not matter anymore ? Question in long : I remember that back in 2005 you had to make sure ...
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ARP default timeout

What is the default timeout period for ARP cache entries on Windows XP? I need to swap round some IP addresses and need to know how long to wait before the XP machines will definitely have cleared ...
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200 views

Getting lots of pings between two routers on shared Wi-Fi. Why is it happening, and can I prevent it?

My apartment complex has a shared Wi-Fi network. There are two Cisco Meraki MR62 access points on each building, and my MacBook periodically switches between them; which is annoying because it drops ...
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Where does the OS fetches the MAC address before encapsulating frames?

packet arrives from application->...Network->(IP encapsulation added here as per IP configuration)->goes down to Data Link Layer Here the Framing is Done and SourceMac and Dest Mac is added for LAN ...
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Does The Apple Airport Allow For ARP Static Mapping?

This question gets asked (doing a Google search), but there are no answers. Is is possible to static map ARP tables on the Apple Airport router (Extreme, Express, etc.). I would like to avoid getting ...
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ARP issue changing Internet connection

Ok I'll jump right in the middle of things. I usually connect my laptop to Internet through wifi at home and it works flawlessly. Problems come up when I try to connect to a friend of mine's wifi. The ...
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Find new ips on network

The solution I want to solve is to discover newly connected ip (and preferably mac and vendor) on the local network. So far I've tried arp-scan and nmap. I like arp-scan mainly because it's fast ...
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Error when run arpd

I'm trying to run arpd to redirect all the traffic originally destinated to some unused IP address, to a machine wich a installed the honeyd (honeyd.org) So, I try to run sudo arpd 192.168.0.0/24 ...
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348 views

IP Address in ARP Cache

I am learning more about networking... I am working on some Wireshark Labs and the subject is ARP. Screen shot of ARP Cache During the lab I did an ARP Cache dump. Fired up Wireshark and went to a ...
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202 views

Network services stopped after installing ARP packages on Ubuntu 14

I installed the following ARP packages: arp-scan arp-alert arping arpon arptables arpwatch all at a time, and that stopped all my LAN and WAN services. Network in settings is showing "the system ...
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186 views

Why would an arp table be incomplete?

Last night I connected to a local BT Fon network that my housemate was already on. My aim was to find his mac address, so I did an arp -a command (from OS X) and it returned only the router address. ...
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Use Ettercap with unknown IP

Is it possible to ARP spoof a connection where one of the participants is only online for a split second with Ettercap (or another tool)? My scenario is a PXE booting client and I want to intercept ...
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Is there any way to determine if the router is forwarding WoL packet to the NIC card while the computer is turned off?

I am having hard time figuring out whether the problem is with the router not forwarding the packets to the NIC OR the problem is the NIC not waking the PC or other hidden settings that are preventing ...
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Is Wake On LAN supposed to work even after AC power reset?

So, if you unplug the AC power cable from the wall and re-connect it to the PC Power Supply, is the Wake On Lan functionality still supposed to work on a PC? The WoL functionality is enabled in Bios ...
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852 views

Excessive rate of ARP requests from Windows 7 spooler service when network printer is off

I'm having series of ARP requests broadcast by a laptop over WLAN, asking MAC address for a range of IP (192.168.0.62 --> 192.168.0.94.) The process runs for the range, stops for a 20 or 30 seconds, ...
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Why wireless router can't detect ARP spoofing?

This is a very begginer question. We know that ARP protocol isn't secure at all. Computers and routers(/switchs) trust in ARP replies and updates its ARP caches (as far as I know). So, why wireless ...
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211 views

Adjusting Ethernet Frame padding for ARP protocol in windows

Is it possible to configure the count of trailing (padded octets) used for stuffing the ARP messages created by Windows 2008? NOTE: I hoped, but could not find any info in the TCPIP_Reg.doc from ...
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arp requesting to another subnet, how?

I’m wondering if I have a computer in subnet A with IP address 192.168.123.1, and a computer with IP address 192.168.124.1 in a different subnet. Both networks are connected with a router. If I want ...
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dhcp no lease because of not-DAD mode

My virtual machine does not receive an IP lease anymore. Manually requesting a new ip lease by 'ifdown/ifup eth0' or 'dhclient eth0' or 'service network restart' don't work either. The error is ...
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Unable to intercept data intended for gateway by using ARP

I am having trouble with what seems to be a very simple problem. I manage to be able to successfully spoof the ARP table of one computer on my network (as reported by arp -a). But even enabling a ...
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Bridge-mode networking and virtual network adapters

Say I have physical network adapter eth0 on my host machine and VirtualBox virtual machine with bridged network. Host and virtual machine have different IP addresses in the same network. I can easily ...
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Windows method to detect ARP Poisoning in my local network (LAN)?

(This question comes from this thread, and is intended to remain as a reference question/answer pair for more generic ARP network detection not limited to WiFi, or without the need of the specific ...
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Detect IP Conflicts on Network

I have a Wireless WAN network that I am managing devices on. We recently had an IP conflict that took us over 10 months to find (we had no idea there was even a conflict until we were pinging a ...
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1answer
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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 for a multihomed machine (Linux)

I try to configure two interfaces on my server to behave as independently as possible on the same medium. However I have some problems with ARP (maybe related to ARP flux). I hope somebody can ...
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How does a router find the MAC address of next hop router?

I know that in an Ethernet LAN, the ARP protocol is used to get a MAC address from an IP address. How does my router get the MAC address of another router on an external network if ARP is not ...
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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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373 views

WOL over Internet success for a while but fail after a period of time [duplicate]

I have a computer in my home LAN, and i have successfully set up my computer and router to use wol over Internet. The problem is, after a period of time(say, a night), the next day i want to start my ...
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What do these arp commands mean?

Now and then my router displays the following error message in the browser: This function is to prevent the attack was interrupted when you use the Internet. Please install to download ARP ...
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Wake-on-LAN stops working after a few hours

I have a Linux server (Ubuntu 12.04.03) which serves as the internet gateway for our LAN of about 15 PCs. That is, eth0 on the Linux server is the Internet, and eth1 plugs into an unmanaged switch (a ...