Tagged Questions

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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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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2answers
44 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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19 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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1answer
39 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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98 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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1answer
57 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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0answers
21 views

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
26 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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0answers
45 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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1answer
261 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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2answers
66 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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1answer
73 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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2answers
679 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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0answers
40 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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0answers
41 views

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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1answer
104 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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1answer
738 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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3answers
2k 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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1answer
2k 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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0answers
93 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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6answers
3k 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
159 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
155 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
94 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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0answers
820 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
6k views

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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1answer
68 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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3answers
322 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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0answers
49 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
126 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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1answer
206 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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2answers
290 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
103 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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0answers
380 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 ...
0
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1answer
196 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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1answer
2k views

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
163 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
438 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
235 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
175 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 ...
3
votes
1answer
956 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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1answer
874 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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2answers
643 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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3answers
297 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
4k views

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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0answers
803 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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1answer
642 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
3k 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
9k views

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
178 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 ...