Questions tagged [arp]
Questions pertaining to ARP (Address Resolution Protocol) a communication protocol used for discovering the link layer address, such as a MAC address, associated with a given internet layer address, typically an IPv4 address.
135 questions
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Why does including --opcode command in arptables work on wifi router 1 but not on wifi router 2
I have a shell script on my linux computer that has these arptables command;
$ cat arptables.sh
mac_address="AA:BB:CC:DD:EE:FF"
arptables -P INPUT DROP
arptables -P OUTPUT DROP
arptables -...
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ubuntu arp problem with who-has x.x.x.x tell y.y.y.y
i have a single server which two VM(ubuntu) configured as ubuntu-edge(with frr module for routing - wan side) and ubuntu-fw(for lan side), between these machines there is a virtual internal interface. ...
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How to get router to respond to ARP requests from switch so i can manage it
I have a web managed switch on my network. It is connected to a router, along with the host PC i am on. I cannot ping it through the router.
Router is Fedora server.
the router's applicable interfaces ...
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get connected lan hosts via arp and output on single line
I'm using the following nmap command
nmap -sP 192.168.1.0/24 | awk '{print $1}'`| awk '/Nmap scan report for/{print " "$5,$6;}/MAC
Address:/{print $3;}'
which outputs
box1.lan (192.168.1....
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Why does a network interface need to have a routing table entry configured to answer ARP requests?
I'm using a fresh minimal Ubuntu server 24.04.1 LTS install. I run these commands as root to set up networking and do some experiments:
apt install -y netcat-traditional tcpdump inetutils-ping
ip ...
- 261
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How to Get All Network Interface IP Address using BMC/IPMI
I have Many server booted up to Debian 12 connected to a common switch.
All I know is their BMC Macs and bmc passwords for each unit(all of them not from same manufacturer).
Is there a standard way to ...
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Why is 00:00:00:00:00:00 address used instead of broadcast address ff:ff:ff:ff:ff:ff in ARP?
The following is my stripped down ARP ruleset, only broadcast rules are shown, other rules (not shown here) are not relevant.
Please see code comments that are questions (?)
#!/usr/sbin/nft -f
add ...
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Setting up network manually, no dhcp, IPV4 only
I’m trying to configure ip (static, so without dhcp), there are some problems that I can't resolve by my self, because I do not understand it in a whole. Sorry if it is already answered, but as I said,...
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arptables not working with nmap
I'm trying to implement a way to prevent network scans from my notebook. One of the things I want is to allow arp request to specific hosts, like my gateway.
I added some rules using arptables and ...
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ARP table shows incomplete entry and connectivity lost
I have Linux device running 4.14.7 kernel. My device-A is directly connected to third-party device(Device-B) over 1Gig port. A UDHCPD server runs on dev-A which always assigns single IP address as per ...
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What's the differnce between "Connection timed out" v/s "No route to host" for ncat command?
I tried to use ncat command to 2 diff unknown IPs from a CENTOS 7 (linux) terminal.
[abc@localhost ~]$ ncat -zv 10.11.78.5 22
Ncat: Version 7.50 ( https://nmap.org/ncat )
Ncat: No route to host.
[abc@...
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How do I get all MAC addresses of all devices on my LAN that have an IP address (equivalent of doas nmap -sn but for IPv6)?
#!/usr/bin/bash
echo "Give me your private IP and its mask";read given
if [[ "$given" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}/{0,1}[0-9]{1,3} ]]; then
echo "version 4"
...
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Linux and KVM Qemu VM - "Couldn't ARP for host" despite that host and VM are both bridged and in the same subnet
I am using KVM Qemu in Kali linux host, and trying to practice ARP spoofing. In the Kali linux (which is connected to wired ethernet network), I have set up the following configuration (from tutorials ...
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Can't see connected devices ip with "iw dev wlan0 station dump" on raspberry
I have successfully turned my Raspberry Pi into a WiFi access point, but I'm having trouble getting notifications when a new device connects or disconnects from it. Specifically, I would like to ...
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What are ARP hardware type 37, opcode 21 and protocol type 0x90bd?
I am currently testing netfilter / nftables / nft. As a starting point, I have made a ruleset that drops nearly everything in and out, and have written the rules so that every dropped packet is logged....
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