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Questions tagged [arp]

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).

1 vote
1 answer
10k views

How do I clear ARP cache in macOS Catalina (10.15.7)?

I am trying to clear ARP cache on my mac. arp -a : displays all the addresses ip -s -s neigh flush all gives me Option "-s" is unknown, try "ip -help" in macOS Catalina (10.15.7). ...
0 votes
0 answers
32 views

Victim loses internet connection during arp spoofing against it

The point is as follows. VirtualBox is installed on my laptop. It has a Kali Linux virtual machine installed with which I want to perform ARP spoofing on my phone. In the Kali Linux network settings, ...
0 votes
0 answers
74 views

ARP request is successful, but TCP SYN is not visible in output of Wireshark

I was redirected from Network Engineering, hopefully below is in scope of on-topics. I have a TCP server, its properties are the following: It runs within a virtual machine (VMware). The host OS is ...
1 vote
1 answer
18k views

Ubuntu server can't reach default gateway/internet

Update: If i change the ip to 10.0.0.11 everything starts to work. 10.0.1.1 is still in the same range in a /22 subnet so it should still work? I have a very peculiar problem with Ubuntu 14.04. I ...
54 votes
3 answers
68k views

Why is ARP replaced by NDP in IPv6?

ARP was replaced by the NDP (Neighbour Discovery Protocol). But I don't know the exact reason for this. Are there any security issues in ARP? Why ARP is replaced by NDP? What are the advantages of ...
0 votes
0 answers
86 views

ARP Requests causing network disconnection

Firstly, apologies if this is the wrong forum, happy to be pointed in the right direction... Recently got new Internet from Virgin Media and have been having constant network issues with them since on ...
0 votes
1 answer
77 views

Does sending packet to machine in local network broadcasts or uses router

If I have 3 machines in a local network let's say A, B and C. Now A wants to send some data to B. Now, A needs to know the IP and the MAC of B. For simplicity, let's assume IP of B is known. a) To ...
1 vote
0 answers
51 views

Why am I seeing ARP requests for addresses outside of subnet

In my home network I have a router running Linux, with several VLANs coming into the same physical interface. This is what things look like on the router: ➜ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> ...
16 votes
3 answers
29k views

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

In the 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 ...
-4 votes
2 answers
313 views

If I changed my MAC address, does it effect my ethernet to internet in anyway?

I'm on a public network and I can connect to WiFi for free but to use internet I need to put username and password. And when my card ended I usually see who's the network with me like I'm doing right ...
0 votes
1 answer
140 views

Why all the MAC addresses on my network is the same?

When I write arp -a on CMD I found all the devices that connected to me network. But the problem is they all have the same MAC addresses? How can I get the MAC addresses for all of them? Is there any ...
0 votes
0 answers
99 views

Libvirt guests on isolated network cannot ping each other

I am trying to create a network with following topology. Because I need a custom Gateway and the network is small, I do not want to use DHCP on the isolated network. ┌─────────────────┐ ...
1 vote
0 answers
196 views

Windows ARP retry interval

I have noticed the following behavior with Windows 10. I am sending an ICMP packet every second or so to a valid IPV4 address using the Windows ping utility. I then remove the device from the ...
0 votes
1 answer
2k views

How is ARP reply generated from Windows 10? Sending ARP req from embedded device through ethernet port to windows10 on laptop

I want to send an ARP request using my embedded device through the ethernet cable to my laptop that has windows 10 on it. I want to receive an ARP reply from windows back to my embedded device through ...
9 votes
5 answers
22k 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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