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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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Same native and tagged vlan possible on Redhat?

I'm looking at implementing a systems using a number of tagged and a native vlan connected to a server over a a/p bonded interface. The untagged vlan is for physical machine access, the tagged vlans are connected to bridges and then to QEMU VM's…
Chris Phillips
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Ettercap - packet injection / alteration

So I have a proxy setup using squid on port 3128. I also have ettercap setup. My main goal is to change data as it flows through my proxy. Basically, you open up www.something.com using my proxy, it displays "lala", and I want to alter "lala"…
Adrian A.
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Computers on one subnet can't connect to the internet

I have an issue with my student computers - they can't connect to the internet. Here's the weird part: I open a command prompt and ping our gateway server, and suddenly everything is fine (at least for a while). I don't know what the ping is doing…
Joel Coel
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CISCO: ARP Poisoning Countermeasures

How can I prevent the Cisco Catalysts 2950/2960/3550/3750 from being vulnerable to ARP Poisoning? Can this be avoided with the ARP INSPECTION? Thanks
Andre
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arp result interpretation

So what does the command arp -a do? I've been told it displayed the MAC addresses of all network cards on the computer, but when I ran it, it displayed three MACs for three IPs (192.168.41.1, .6, and .8 (24-bit subnet mask)). I assume the first is…
Richard
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Two NIC's in the same ip segment

What is the best technical solution to solve this? I have a /24-segment with two NIC's in one Linux Server (lets call it srv) that have two IP-addresses in this segment. NIC1 / eth0 / 10.10.1.101 / MAC1 NIC2 / eth1 / 10.10.1.102 / MAC2 The segment…
rubber boots
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How to stop my VPS from picking up ARP reqs it is not supposed to?

Machine: Xen-3.0 image running stable Debian Linux 2.6.18, pretty vanilla. My VPS provider asks me to deal with some trouble my image is causing, namely handling IP addresses it is not supposed to: The problem is that your server seems to be…
Charles Stewart
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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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docker swarm temporarily stops accepting request in production

I am running an angular application in docker swarm in production. Randomly the application stops working for like 10 minutes. The containers are running fine. I see the arp -a says the arp incomplete for two containers. How should I troubleshoot…
CodeWeed
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