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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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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34 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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41 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 ...
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3answers
79 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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47 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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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
177 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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2answers
114 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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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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54 views

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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52 views

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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126 views

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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2answers
174 views

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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3answers
106 views

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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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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29 views

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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74 views

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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1answer
53 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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83 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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294 views

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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2k views

How do i get the ARP list from our router (programmatically / in the command line)?

At our office we have a netgear router, I'd like to poll it to see who's in the office (preferably on the command line) because i'm weird like that.. Is their a standard way of doing this? is it ...
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258 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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2answers
68 views

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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30 views

(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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103 views

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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1answer
242 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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51 views

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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660 views

Redirect Spotify Connection

At my home I have two computers: At one I have a connection to a Hi-Fi system and I use Spotify in it. I usually use remote desktop from the other computer to change the songs but now I'm wondering if ...
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1k views

Can I temporarily affect ARP table without using `arp` command directly?

I have some knowledge about arp command under linux which can help modify the ARP table. Now I want to temporarily affect ARP table(add, delete and change) entries without the help of arp. For ...
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221 views

How to force to send data to router (on L3) instead sending directly? (on L2)

I have a public IP-addr on one machine: a.b.c.156/32 The GW is a.b.c.133 (which is in the /27 network with its gateway a.b.c.129) I statically added an arp route: sudo arp -an a.b.c.133 at ...
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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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61 views

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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44 views

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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414 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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229 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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247 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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1answer
86 views

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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101 views

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 ...
2
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1answer
958 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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1answer
6k views

How can I stop my computer from doing arp poisoning attacks?

I have a small LAN in my home about 4 - 5 computers. The problem is that when there are usually 3 or more pc's online we keep losing the Internet access randomly about every 2 minutes. So we took a ...
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247 views

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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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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249 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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1answer
790 views

arp add 255.255.255.255 ff:ff:ff:ff:ff:ff (router)

If I add arp entry in router config like this: arp add 255.255.255.255 ff:ff:ff:ff:ff:ff Open specific port: port: 1009 ip: 255.255.255.255 Will it broadcast message to all connected devices? ...
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88 views

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 ...