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Questions tagged [arp]

Address Resolution Protocol is a layer 2 networking protocol used for resolving layer 3 addresses (such as IP addresses) into layer 2 addresses (such as Ethernet MACs). It is used by network devices when communicating with devices on the same layer 2 network.

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What happens if I ask 127.0.0.1 via arp broadcasting?

Will all the computers on the network will answer me?
John Terry
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ARP packets never routed?

is it true ARP only works in single broadcast domain and arp packets are not routed frm 1 network to another ? can any one give me any example or any source of info for this hoping for positive response.
Vishwanath Dalvi
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Clearing ARP cache on ESXi 4.1

We recently migrated our entire VMware cluster from ESX over to ESXi. For the most part, the transition was seamless, and I haven't missed having access to the SC. Until now. We're trying to diagnose some odd unicast flooding behavior that's…
EEAA
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How to configure remote access to multiple subnets behind a SonicWALL NSA 2400

I have a client that uses a SonicWALL NSA 2400 as their firewall. I need to setup a second LAN subnet for a handful of PC. Management has decided that there should be a second subnet even though intend to allow access across the two subnets - I…
Kyle Noland
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No ARP reply on tap0 (KVM bridged networking)

I wanted to assign an external IP address to my KVM guest and went the bridged networking way. Unfortunately the guest has no network connectivity and I don't know why. After investigating it seems that it doesn't get any reply for it's ARP…
MasterM
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nmbd "Packet send failed" error

I'm desperately trying to get folder sharing over SMB working on my local network. I'm running up-to-date arch linux and connecting over wifi using wicd. I have latest samba installed (4.10.4). While it does work occasionally, it consistently breaks…
Lurzim Sabahudin
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Ping problems with two interfaces, same subnet, direct connections to two separate hosts

I have a configuration of a client machine (Ubuntu 14.04.2 LTS) that directly connects to two server machines. The server machines--while on the same subnet--cannot route to each other. Packets must not route between the client's eth1 and eth2,…
doktorstick
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ARP behavior in Linux

I have a L3 switch. Port 1 and port 2 of the switch are added to VLAN 30 and an IP address (30.0.0.1) is assigned to it. Port1 and port2 are connected to Host1 and Host2 respectively. Host 1 and Host2 are assigned with IP as below L3 swtich port1…
Vasanth Kumar
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Is it the normal behavior of arp requests?

Sometimes I dive into my network and often I see: tcpdump -n arp 17:59:15.754508 ARP, Request who-has 192.168.1.65 tell 192.168.1.212, length 28 17:59:16.754401 ARP, Request who-has 192.168.1.65 tell 192.168.1.212, length 28 17:59:17.754449 ARP,…
watchmansky
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ARP response is not present on the other port of linux bridge based on ubuntu 13.10

I recently build linux based bridge for packet monitoring purpose, but there is BIG problem. the environment is, overall env. target of monitoring is VMs on vSphere. two vSwitches are configured on vSphere host. vSwitch 1 is configured with NIC…
sio4
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arp who-has requests view vlan isolated different addresses (single NIC)

I have debian hosts which are connected through trunk port on 5 different vlans. But this host respond to arp "who-has" requests of all of their differents ip. I wish understand why ... Here the network/interfaces file (eth0.1 handle…
jjumper
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Windows 7 Requires ARP for UDP?

Seems like my Windows 7 box (with 2 NICs if that's relevant) requires an ARP response before it sends packets to a certain IP address. The specific context I'm in is running a TFTP server (TFTPD32). The server hears the request, sends out an ARP…
vicatcu
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pfsense single MAC is listed with several IP's in ARP table

I have this problem: arp table filling up But I am quite sure that I cannot blame Kaspersky. Scenarie: a user plugs his computer in. He waits and waits but are getting no IP by DHCP. Then he is told there is an IP conflict... He end up assigning…
Tillebeck
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How to prevent / detect ARP poison rooting attacks?

Although we have not had any first-hand experience with these kind of attacks (as far as we know of) I would like to know how to prevent them from happening as much as possible. I mostly use my personal laptop myself and also take it to clients when…
Aron Rotteveel
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How can I configure permanent arp entries on Red Hat Enterprise Linux?

I'm configuring a Red Hat Linux server which will be sending UDP packets out but never receiving ARP responses. So a static ARP entry is required. The obvious way to do this is. arp -s 10.0.0.1 distant_server However that won't survive a network…
happyhairydude
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