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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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 ...
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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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102 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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645 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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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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156 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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280 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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528 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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140 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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518 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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219 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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190 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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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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327 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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226 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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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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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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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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405 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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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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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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800 views

Being ARP spoof, how to keep a right ARP cache on OS X?

At dormitory, our PCs/NBs seems to be attack or say arp spoofing? The guy(s) may using the software like "skiller" or "netcut" or much more enhanced software attacking us, we can only use a software ...
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3answers
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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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195 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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1answer
387 views

Wireless card fails to receive ARP resolution answer from Router

I have a Windows Vista laptop here with an Atheros AR5007EG wireless card. When attempting to connect it with an AVM Fritzbox 7330 the following happens: Laptop successfully negotiates DHCP and ...
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4k views

Why does a PING reply require an ARP request for the originating hosts MAC?

I have a scenario as depicted below. Here two host machines are connected via a hub: Ok, so host-1 wants to ping host-2 and i have setup wireshark on a 3rd host connected to the same hub. Now ...
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320 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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3answers
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What is the I.P. address 224.0.0.22 for? [duplicate]

Possible Duplicate: What are the purposes of the addresses in this ARP table? I notice that ANY computer that I go to, if I do a arp -a command from a command line, I receive a reply back ...
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686 views

ARP: 'Who has' broadcast resulting in TCP segment losses

I have an issue with a simple TCP connection between two PCs (both Windows XP SP3) connected by direct wire to each other. These PCs have IP address 10.10.10.1 (server) and 10.10.10.2 on the network ...
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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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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 ...
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What layer of the TCP/IP network does ARP belong to? [closed]

I'm working my way through the Sams teach yourself TCP/IP book and it say's that the Address Resolution Protocol belongs at the Internet layer. Is this true? Other sources claim it is a Network ...
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1answer
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Wireless fails until one does arp -d 192.168.1.1

My wireless fails from between some minutes after being connected to half an hour or more. Symptoms: new pages not opening downloads already in progress continue ping 8.8.8.8 not working The ...
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1answer
5k 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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1answer
929 views

wake on lan from internet - problems with router: arp

I've ubuntu server on lan with static IP within lan, I use router: DSL-2640B. For waking I use program called "wolcmd". From within lan network it is very easy to wake up the machine. I just issue ...
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How can I add an active arp entry on Win 7

I can't see to find a way to add an active/dynamic arp entry. This all started with old Win32 exe that calls the SetIpNetEntry API to create a dynamic/active arp entry as part of a process to setup ...
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680 views

why do I get a different MAC address using arp and ifconfig?

# ifconfig eth1 Link encap:Ethernet HWaddr 00:1e:8c:10:xx:xx # arp Address HWtype HWaddress Flags Mask Iface 192.xxx.x.x ether ...
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target IP address is same as source IP address in ping ARP request

I am working on wireless driver. But I feel this question is just a general network question. I saw strange content of the first ping packt, which is an arp request, where the target IP address is ...
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1answer
311 views

Why would an iPod Touch and PS3 respond to netdiscover as 0.0.0.0?

Only slightly related to this question, because it was discovered in the same scan: Can someone explain how this happened? When running netdiscover on my home network, my iPod Touch (identified by ...
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1answer
340 views

Can someone explain how this happened?

I seem to be having some odd results when running netdiscover on my home network. From the cable modem to my scanner (skipping a few peripherals), here's the basic layout: The cable modem is ...
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1answer
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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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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729 views

Detect changes to routing table or address resolution protocol on Windows 7

On two different Win7 PCs we're having a very specific problem where connecting a device which uses a RNDIS driver sometimes disrupts the PC's network adapter connection (we detect this because we ...
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What happens when an ARP Request arrives to an Ethernet switch?

I remember reading somewhere that switches defined "data link layer broadcast domains": that is, data link broadcasts from one network connected to the switch are not forwarded to the others. If this ...
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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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738 views

Wireless router's ip address

Does my wireless router have an ip address that's independent of my computer's ip address? Is there any way to determine what that ip address is? Note: I'm not talking about the internal router ip ...
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3answers
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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 ...