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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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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1answer
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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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83 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
3k 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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2answers
29 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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6answers
2k views

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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1answer
28 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
598 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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2answers
104 views

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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5answers
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how does 'ping' command really work?

How does the ping command really work? Specifically where does the ARP (Address Resolution Protocol) come into picture? I was asked this question in an interview and I was not able to come up with ...
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1answer
256 views

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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1answer
58 views

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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3answers
380 views

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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3answers
2k views

How to run webcam software only when I am not home (phone is not on the LAN)?

Currently I've got my user cron starting Motion on a timer when I typically leave for work, and then killing it when I typically get home, so I can watch my cat/burglars/etc: 0 9 * * * killall motion ...
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2answers
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How can I block NetCut in my network?

I am facing a huge problem in my shared network. We are almost 30 users sharing a single internet connection. Someone is using NetCut and taking all the bandwidth from us. Not allowing even to send ...
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1answer
1k views

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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1answer
102 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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1answer
100 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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1answer
750 views

Home Networking: Connecting a switch to a router

I have the following network setup: EE Fibre going to a BT Infinity modem. EE Brightbox router, WAN port connected to the EE Modem. Port 1 connected to a Netgear Gigabit Switch 8 Port Netgear GS308 ...
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79 views

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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406 views

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 ...
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2answers
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Two computers cannot ping one another - both connected to the same switch

I've got two physical computers which are connected to the same unmanaged switch. Said switch is connected to a server handing out IP addresses and acting as a gateway. This works fine. Clients that ...
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Windows 7: The ARP entry addition failed: Access is denied

I'm on Windows 7 and am trying to assign a static arp entry for my default gateway using the command: arp -s 172.24.7.254 00-05-01-f9-28-00 172.24.1.20 But I get the following error: The ARP ...
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2answers
236 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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1answer
59 views

When does my machine know its DNS?

Assuming I have not setup a proxy server, how does my windows-based machine know my dns? Is this also determined with filling the arp table gateway entry? Or is DNS "solved" after ARP by another ...
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43 views

TTL is not changing for particular computer

I'm running ping command for several computers in local network. Most of them have TTL=63 and then it becames 64 as ARP caches MAC-addresses of that computers. But pinging one of them always has ...
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1answer
118 views

Values below “Starting IP address” in linksys router.

In my basics setup in linksys router, I've set Starting IP address to 192.168.1.100. How can you explain that in ARP/RARP Table I can see users with addresses 192.168.1.25 and 192.168.1.26?
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What adds these Multicast IPs to the ARP table, as static entries?

(Similar to my previous question, but addressing a separate aspect which has gone unanswered.) I've seen this on my Windows 7 computer, and searches have turned up others in Vista/7 who have seen the ...
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234 views

Why am I getting arp requests from local machine?

I'm connecting wireless network (provided by apartment, so possibly quite a lot of machines connect to it) and I noticed that ARP requests from local machines send to my machine instead broadcast ...
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1answer
155 views

Arp table on a multi switch vlan

Lets say I have multiple cisco switches that are all on the same VLAN. The question is: If I do "arp -a" on a pc that is connected to one of the switches. Do I get the Ip and Mac addresses of all ...
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1answer
93 views

Address Resolution on WiFi with TP-LINK router

I have a TP-LINK WiFi router which shows lan IP addresses and computer mac addresses under Device Info > ARP. I am interested to read this info from my computer (Ubuntu 12.04) connected to the same ...
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302 views

Linux ARP source address wrong, when pinging from different interface

I'm seeing some weird behavior, and was hoping someone could explain to me why this is happening: I have a linux box with two physical interfaces: arnout@arnout-VirtualBox ~ $ ifconfig eth0 ...
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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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1answer
178 views

Two network routers on the same IP

I have a network with several routers serving as accesspoint connected trough a switch to a central DLS/router/AP. One of the slave router have been somehow partially reset (SSID changed to 'default' ...
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147 views

Why is there an external IP on my home LAN network?

I am detecting an unknown IP address on my home LAN network. Can someone explain to me why might this be?
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1answer
179 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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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
286 views

what's IPv6 analogue for IPv4 `arp -an` and “arp who-has”?

In IPv4 world, when you want to talk to another computer, you ask which MAC address claims a given IPv4 address, the arp who-has ... tell ... exchange as per tcpdump, and a cache of such mappings from ...
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1answer
193 views

Why is ARP in Mac going crazy? How to disable it?

This is the first time I am observing the ARP request from my Mac is going crazy. It keeps sending the ARP request for last an hour. The requests are like following (using wireshark) 484975 ...
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1answer
158 views

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
760 views

Window 8 machine cannot ping devices on same subnet

After returning from vacation during which several Windows updates were applied and my router suffered a hard power cycle, my Windows 8 Desktop can no longer ping other devices on the same subnet. ...
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1answer
170 views

Why does Knoppix mess up my internet connection?

I have this problem that when I boot Knoppix on my Windows box, it screws up the internet connection somehow, so Windows cannot get an IP when I reboot back to XP. I use Verizon FIOS. Normally I have ...
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3answers
255 views

Duplicate MAC but different IP on home router

Would it be possible to have duplicate MAC addresses but different IPs on a home router? My questions are listed below. I don't have computers with the same MAC. The second connection displays no ...
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2answers
550 views

How is ARP about two VMs running on VMWare?

I know that systems in network connect together with IP and Mac address ,But insofar as i now all of OSs running on virtual machine use a common network card.I want to know how another systems connect ...
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4answers
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Inverse ARP lookup

How can I do an inverse ARP lookup in Windows and/or Linux? Say that I have the MAC address of wireless access point which is up and running in the network, but I forgot it's IP address?
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3answers
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Given a PC's MAC address, can I find its IP?

Is there a way to get the IP address when all you have is the MAC of an item?