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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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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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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173 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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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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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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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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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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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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29 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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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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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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253 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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229 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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467 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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236 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 ab:cd:...
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231 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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239 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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2k views

DD-WRT router causing IP address conflicts across network

My DD-WRT router has lost its mind! (Caveat: technically neither of these devices are "routing". I'm going to call them routers anyway.) I just set up two DD-WRT routers, one as a WAP (working fine) ...
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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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127 views

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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2k 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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139 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 ...
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138 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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203 views

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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686 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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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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11 views

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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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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12 views

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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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 TTL=...
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386 views

what's wrong with ARP Table in Windows?

I use Windows 7. And I set entry of Gateway in ARP table is Static. But I set Mac's Gateway wrong and I can't use Internet. So I use command "arp -d" to delete ARP table, then I can use Internet. But ...