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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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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 resolved by modifying the kernel code to make it…
Frontier_Setter
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Ping request generates response but sender doesn't see response

I have an embedded linux system with an ethernet PHY that is connected to a switch and then directly to my PC. After setting static IP addresses I found I could not get a working ping in either direction. Using Wireshark I notice that the ping ARP…
chorus6
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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 like macvlans/ipvlans (l2) etc but I think perhaps it's…
Alan Hollis
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Packet capturing using arp poisoning and IP forwarding

I made a script in Golang that allows me to perform ARP poisoning attack and with that I enabled IP forwarding to forward the packets to my router. When I use pcap.OpenLive I can only see the packets from the attacked device to the router. For…
has van
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Bridging firewall between two sites with same network

We have been assigned an IP-network for a test lab we can use for our equipment. To make sure our mistakes wont leave us nor anything from the outside will disturb us we want to setup a firewall without without NAT. We simply want a firewall so we…
Joppe
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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 hurts all the rest of networking pretty bad. As I…
lightman
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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 command. Link failures are simulated by turning on/off the interface using ifconfig…
person17381
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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 B which already included the pair, would it…
Steve Moretz
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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 ens4f1.1 proto kernel scope link src…
Zedder
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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 both devices are correct. On both the Linux Server…
Ex Umbris
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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 is as follows. sudo ip tuntap add dev tap0 mode…
Shikugawa
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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 10.99.0.1 dev enp1s0 proto static onlink 10.99.0.1 via…
joshuao
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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 (Debian) installation with multiple applications that…
Jason
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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 with success. what is the command to update mapping of IPv6 address and mac on router/gateway/nodes. we have observed when…
tushars
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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 107.189.30.113 netmask 255.255.255.255 I was…
Harmonytalk
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