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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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ARP request flood

I have one modem/router connected to the Internet. I have one Linux server connected to the router with ethernet cable, two printers connected by WiFi and four phones/tablets and a Linux box also ...
SDC's user avatar
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ARP resolution does not work as intended in VPC when doing L2 Announcements with CIlium CNI on a K8S Cluster spanning EC2 instances

VPC Configuration VPC CIDR: 10.0.0.0/16 Region 1: 10.0.0.0/24 (public), 10.0.64.0/24 (private) Region 2: 10.0.16.0/24 (public), 10.0.80.0/24 (private) Region 3: 10.0.32.0/24 (public), 10.0.96.0/24 (...
Ayush's user avatar
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ARP announcement when nobody listening?

I have a system of three components which are, one switch, and two network nodes. Additionally I added a laptop (incl. wireshark) to one switch port to which I mirrored all traffic (ingress, egress) ...
nyyrikki's user avatar
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1 answer
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Routing with an Allied Telesis switch and ARP bottleneck

I use an Allied Telesis x610/24-Ts switch as a central switch in a company building. The central switch connects several edge switches and also provides routing between VLANs. The forwarding ...
Jerry Xia's user avatar
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No connectivity in LAN (arp table does not learn IP addresses)

enter image description hereI have a server connected with NICs as follows, 10.0.11.11/24 - no gateway required. 10.0.10.11/24 - with gateway 10.0.10.240 192.168.2.11/24 - no gateway required. When ...
Vidura Thammitage's user avatar
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S2S VPN - cannot ping B from A until A pings B

I'm working on site-to-site VPN between 2 networks within private cloud. On both ends I installed Strongswan and established VPN connection. The problem is that I'm not able to ping from A (10.0.1.0/...
k-wolski's user avatar
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1 answer
256 views

Ping: "Destination Host Unreachable" even though ARP request succeeds

I have a wired interface with a static IP configured. Pinging the gateway results in "Destination Host Unreachable". PING 10.3.3.246 (10.3.3.246) 56(84) bytes of data. From 10.3.3.8 icmp_seq=...
StackedCrooked's user avatar
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118 views

Martian packet with ARP broadcast traffic

Server nodes keep getting ARP broadcast traffic and becoming martian packets due to assymatric routing. I was known that when strict filtering is enabled with net.ipv4.conf.eth0.rp_filter = 1, the ...
Rama's user avatar
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Redirect Traffic on OVS switch

I have below topology on mininet: Host1:10.0.0.1/24 mac :aa:00:00:00:00:01 Host2:10.0.0.2/24 mac :aa:00:00:00:00:02 Host3:10.0.0.3/24 mac :aa:00:00:00:00:03 I want to redirect traffic as below: When ...
dyvesh mahadea's user avatar
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MITM attacks inside VPN network?

Is it possible to use any MITM attacks (including ssh-mitm) if I'm connected to a VPN? OpenVPN connects me via tun0 interface with some IP in 10.0.0.0/8 and gateway at some IP 10.0.0.0/8. I know that ...
undefined undefined's user avatar
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400 views

How ARP (address resolution protocol) works with ethernet bonding?

We use a dual network card server with bond in 802.3ad mode. The outgoing bandwidth on both network cards is balanced, but the incoming bandwidth is concentrated on one network card. This issue is ...
Frontier_Setter's user avatar
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1 answer
2k views

How to retrieve device names on local network?

Currently I'm trying to retrieve the name of each device that is connected to my local network, like my phone, laptop, printer, chromecast, etc. After doing some research, I know that its fairly ...
gravityclover's user avatar
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Is there a method of performing "local arp" requests on linux

I have some code that performs an arp-scan, I wondered if there was a way within a single machine to have "something" respond to arp-scan within the same host. I've tried a few things so far ...
Alan Hollis's user avatar
1 vote
1 answer
108 views

How can I use nmap against an IPoIB network?

I'm trying to use nmap to check which services are running on a given network but it cannot start just because nmap issues ARP Ping Scans on IPv4 network, and on a Infiniband Network, as far as I know,...
Vinícius Ferrão's user avatar
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Linux confusing MAC addresses for its IP addresses to Cisco switch?

I have multiple CentOS boxes (both Centos 7) with two different servers. These servers have 4 10GB interfaces each. They are connected to two Cisco Nexus switches. Each NIC has a different IP address, ...
user1955162's user avatar
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Host ID's on Network not in succession of 'active' or established devices?

Disclaimer: I am new to networking. I ran a arp -a command on Terminal to establish what devices are currently active on the network. I was returned a number of devices with Host ID's that were not in ...
BuiltByDan's user avatar
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1 answer
302 views

List all active devices in different subnets?

My company has a class A network that contains various subnets. I need to automate a way to produce a list of all online devices (in all the subnets). To start, just a list of responsive private IPs ...
Andrew Campi's user avatar
1 vote
0 answers
248 views

ARP requests not passed between instances across the same subnet or connected to the same router

I have a k8s cluster deployed in OpenStack which for communication uses internal network and only the Master nodes have floating IP's in the external network. I am trying to use MetalLB load balancer(...
Marius Gulie's user avatar
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1 answer
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Using a VLAN in embedded linux and although a response is received no entry made in ARP table

I need to set up 2 VLANs, but I have this issue even with only one configured (.2) but when I set up the other VLANc (.1) it seems to work ok. The issue is that ARP doesnt seem to work which sort of ...
lightman's user avatar
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1 answer
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Linux: Why is ARP not answered via VLAN Bridge

Our Goal We want to run a server with several QEMU VMs, some of the VMs should be connected to separate VLANs. The host is connected to a switch via bonding and should have a VLAN-aware bridge where ...
luzze's user avatar
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2 answers
835 views

Network ARP scanning for unknown ip address

Today, i did Wireshark network capture on a LAN, i've found a broadcast storm from a computer. The broadcast storm has stop but i would like to know why and what cause this broadcast storm. Here is ...
chaft's user avatar
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Linux is answering (wrong?) to Gratuitous ARP message

I've a Centos 7 Linux server with 2 physical interfaces, each of them has 2 subinterfaces, which are P2P /31 interfaces two Cisco. After changing neighboring Cisco devices Linux router started to ...
Edvinas's user avatar
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1 answer
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Why can't ndisc6 update the kernel neighbor table?

I've been doing some work with ARP/NDP and discovered that ndisc6 doesn't update the neighbor table (unlike arping). arping example: 192.168.0.14 is configured on a device connected to a VLAN member ...
theasianpianist's user avatar
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504 views

ARP Cache Entries Invalidated

I am doing some SDN research. In order to avoid having to route ARP packets, I manually set arp IP to MAC mappings on the hosts using the arp -s <ip> <mac> command. Link failures are ...
person17381's user avatar
-1 votes
1 answer
800 views

Getting the MAC address of a remote host? Linux, macOS, Linux [closed]

I am writing a custom application in Go. My app needs to work on Linux, macOS, and Windows 10+. I need to verify that a remote host is what I think it is. I've tried arping and as expected, it does ...
PrecisionPete's user avatar
1 vote
1 answer
290 views

NTP traffic causes frequent ARP requests

I am running Ubuntu LTS 22.04 using Chrony as NTP server. I discovered that even with frequent NTP traffic between a NTP client and the NTP Server, the ARP requests are still being sent back and forth ...
RXS's user avatar
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1 answer
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Arp behavior on non requesting user for response

If we imagine we already have a valid cache for a pair in computer B and then composer A asks about the same pair and computer C responses with the pair information, what would happen here to computer ...
Steve Moretz's user avatar
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1 answer
967 views

Why MetalLB cannot provide a real load balancing feature in layer 2 mode?

The documentation of MetalLB states that: In layer 2 mode, all traffic for a service IP goes to one node. To my understanding, this is mostly due to the fact that: one node assumes the ...
Dunatotatos's user avatar
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108 views

Linux MAC learning outside network

How can I forbid create ARP records in Debian for IP outside network assigned for device? For example: ip route 10.10.0.0/20 dev ens4f1.10 proto kernel scope link src 10.10.0.1 10.11.0.0/22 dev ens4f1....
Zedder's user avatar
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ARP Weirdness - Missing ARP replies?

Here's a picture of the relevant portion of my network. The problem is as follows: The Windows PC at left and the Synology NAS are both able to reach the two webcams (ping) and the ARP tables on ...
Ex Umbris's user avatar
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ARP Reply is not forwarded to TAP device through Linux Bridge

Create two TAP devices, each of which will be read and written by the userland protocol stack. In addition, the two TAP devices are bridged by the Linux Bridge. The script to prepare the environment ...
Shikugawa's user avatar
2 votes
1 answer
727 views

Using OVH VRack, 2 PVEs can't fully communicate

In OVH, I have 2 ProxMox servers, each one containing a Firewall and a few other hosts. I am trying to use OVH vRack for private communication between them, but it is not working. Here's a summary of ...
Gilberto Martins's user avatar
-2 votes
1 answer
296 views

Discover IP address of the device knowing only MAC address

While "wiresharking" the network, You may come across packets that looks like THIS eth.src to eth.dst (mainly colored white).. sometimes Wireshark recognize protocol LLC, NDP etc.. but ...
apech zzz's user avatar
0 votes
1 answer
2k views

Linux bridge doesn't respond to ARP requests after an ip rule is added

I have a virtual machine created with libvirt/qemu/kvm attached with a TAP to a Linux bridge (virbr1). Internally the VM has an IP of 10.99.0.9. And has the following routing setup. default via 10.99....
joshuao's user avatar
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107 views

ARP Connectivity Issues Between OpenMediaVault Server and BSD Jails

On my network I have two servers. Server1 is running TrueNas(BSD) with multiple applications running in iocage jails. It's connected to the network with a 3-nic LAGG. Server2 is an OpenMediaVault (...
Jason's user avatar
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1 answer
423 views

How to send/broadcast ipv6-mac maping cache update request for IPv6 IP

We can update IPv4 neighbors by using arping command. I have used arping -A -I -c <interface_name> <IP_address_of_interface> with success. what is the command to update mapping of IPv6 ...
tushars's user avatar
3 votes
1 answer
2k views

Linux: What causes static ARP entries to flush on link down

This is a question about a difference in networking behavior between Debian Buster (kernel 4.19.0-18) and Debian Bullseye (kernel 5.10.0-9). On Buster, proxy arp entries survive if the link on the ...
roelvanmeer's user avatar
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1 vote
0 answers
1k views

Proxmox ARP cache causing virtual machines MAC to change?

I am having an issue with Proxmox and ARP changing the MAC address of virtual machines. arp -a returns: ipxxx.ip-51-89-201.eu (51.89.201.xxx) at fe:ed:de:ad:be:ef [ether] on vmbr0 This virtual ...
Toodarday's user avatar
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2 votes
1 answer
2k views

IPv6 connectivity suddenly lost, IPv6 neighbour router status becomes STALE at the same time. How can I avoid it?

I have a VM on a host with bridged networking (hence, with its own MAC address). Both host and VM run CentOS. Their network is managed by simple /etc/sysconfig/network-scripts/ifcfg-enpXsY files ...
Ned64's user avatar
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2 votes
0 answers
532 views

No responses to ARP requests

One of my server's physical interfaces eno3 is part of a bridge br0. There is also one LXD machine attached to this bridge (nictype=bridged, parent=br0). Sometimes ARP stops functioning completely. If ...
NeroP's user avatar
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1 answer
580 views

Limit ARP to gateway IP only

My current network setup is as follows auto lo iface lo inet loopback dns-nameservers 8.8.8.8 8.8.4.4 auto eth0 iface eth0 inet static address 104.244.72.242/32 gateway 107.189.30.113 pointopoint ...
Harmonytalk's user avatar
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3k views

Linux does not send arp reply

I have an interface keeping receiving arp request but never respond. Can anyone help? My interface ip is 192.168.40.2. The routing table looks good.
Joe Lu's user avatar
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2 answers
2k views

Static ARP Entries aren't being added

So I'm trying to create a static ARP Entry with the ip and MAC Address of my router. I'm currently using admin command prompt and the command arp -s [ip] [mac address], but it isn't working. Every ...
Ryan Ding's user avatar
0 votes
1 answer
2k views

Why can't I arping the direct broadcast of the LAN to populate the arp table?

I'm trying to write a simple network discovery for my linux 2.6 router. I'm testing arping which is bult inot busybox. I can't work out why sending a single request to the direct broadcast is not ...
rs232's user avatar
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2 answers
920 views

can ping but not arping via OpenVPN

I'm working on a remote machine using OpenVPN at a customer's network. The IP addresses there change dynamically and (until they get hostnames to work properly which is not in my hands at this point) ...
Cookie's user avatar
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3 answers
2k views

Windows Incorrect MAC Address Populating ARP Table

Recently I have been running into issues where incorrect MAC Addresses are populating the arp tables of some Windows VMs running in a Cloud Provider's cloud. For example, if I ping 10.1.2.3, some ...
Howard_Roark's user avatar
1 vote
1 answer
2k views

What are the symptoms of an IP address conflict?

System administrators must take special precautions when setting up two DHCP servers on the same network. The most common problem caused by competing DHCP servers is an IP address conflict. Windows is ...
Rick's user avatar
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2 votes
1 answer
1k views

Strange entries in ARP table

I noticed some strange public IP addresses in the ARP table of my Ubuntu laptop. They also keep reappearing quickly after flushing it. The adresses all resolve to bc.googleusercontent.com and only ...
jogo's user avatar
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2 votes
1 answer
63 views

Finding static IPs after reboot

I am having troubling pinging IP addresses on the local network after rebooting or clearing the ARP table. I am looking for guidance on fixing this. I have a windows 10 PC which is has a 4 port ...
Adam V. Steele's user avatar
2 votes
1 answer
475 views

ARP table emptied when TAP interface is added to bridge

I have a problem with ARP table on CentOS. Sometimes, when I create a TAP interface and add it to a bridge, the ARP table is cleared up. E.g. when I execute this command: sudo ip tuntap add dev tap-...
Nathan's user avatar
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