Server Fault Stack Exchange
Server Fault Stack Exchange

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.

421 questions
2
votes
1 answer

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 my network: The goal is accessing PRD1FRM206…
Gilberto Martins
  • 37
  • 6
2
votes
1 answer

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 which contains the static IP addresses. IPv4 works…
Ned64
  • 303
  • 1
  • 3
  • 12
2
votes
0 answers

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 I look at a capture of traffic on the bridge…
NeroP
  • 21
  • 2
2
votes
1 answer

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 appear on my Server-VLAN (ID 90) as (obviously)…
jogo
  • 75
  • 1
  • 2
  • 8
2
votes
1 answer

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 Ethernet card. The ports are all set up with static…
Adam V. Steele
  • 123
  • 3
2
votes
1 answer

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-device-u98 mode tap; sudo ip link set dev…
Nathan
  • 43
  • 7
2
votes
1 answer

Proxy-Arp setup with Keepalived

I currently am trying to create a setup with N servers where 1 server is the master for a Virtual IP, and the (N-1) servers act as backups, presumably controlled by keepalived. However, one issue I see with keepalived is that its intention is to…
stoneman_41
  • 121
  • 1
1
vote
1 answer

QEMU/KVM/libvirt macvtap VEPA not working - ARP request not forward

Hi I've been struggling to get guest networking working when using a macvtap in VEPA mode between two VMs on a host. I've spent hours (days) googling with no joy. Does this network configuration actually work? I created the vtap's using KVM Manager…
Bren
  • 11
  • 4
1
vote
2 answers

Too much ARP 60 Packets and Network is getting very slow

I am seeing too much ARP 60 packets from one IP in wireshark. Our LAN is getting too slow, But the internet is working fine without any issues. But cant access local printers, file share etc Am attaching the image with this. Is it normal to have…
Muneeb K
  • 111
  • 1
  • 1
  • 3
1
vote
0 answers

Setting up Linux bridge for all VLANs (tagged) when bridges for same VLANs (untagged) exist

TL;DR: Does anyone know how to get bridges associated with a VLAN (like virbr0.101) and a generic bridge that supports all VLANs (like virbr0) to co-exist? Sorry for the rambling backstory, but I'm building this up in layers for you. I have a…
Marc.C
  • 11
  • 2
1
vote
1 answer

Windows 2012 R2 Domain Controller making ARP requests outside of subnet?

I have a Windows Server 2012 R2 box acting as a Domain Controller which is on a segregated LAN. It also acts as the DNS server for this LAN. I also have a Sonicwall NSA 2600 firewall which is set as the default gateway for all machines on the LAN,…
MagikarpKing
  • 11
  • 2
1
vote
1 answer

Can I use source MAC of Ethernet packet for UDP reply instead of ARP lookup?

I'm working on an embedded platform with very limited resources where I need to build my own Ethernet frames. If I need to answer a UDP request with a UDP reply, is it ever not OK to just send the reply back to the Ethernet source MAC address of the…
Markus A.
  • 419
  • 7
  • 18
1
vote
1 answer

Linux: answer arp instead of the kernel?

Is it possible to answer ARP requests in user mode instead of inside the kernel? I can create a ETH_P_ARP socket but not sure if I can completely replace the kernel strategy at this level.
Kroma
  • 113
  • 2
1
vote
0 answers

How do I make Arpwatch only send new activity/new station emails?

I had set up Arpwatch on my office's pfSense 2.4.3 gateway. Ever since I had done that, I started getting a whole lot of emails - most of them very useful, while some are less useful. I wonder if there is any way of restricting Arpwatch's reports…
Oleg
  • 373
  • 1
  • 7
  • 17
1
vote
0 answers

Sending ARP requests with SmokePing

I have been using SmokePing to monitor my local network for some time now and I'm happy with its graphs and email alerts. I use the fping probe and it works as expected. I found however that, every now and then, some of my hosts won't respond to ARP…
ccrisan
  • 111
  • 2
1 2 3
…
28 29