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.

406 questions
0
votes
1 answer

ARP Connectivity on cisco small LAN

I feel so lame to have this doubt, so there is the question : Why do I not have connectivity ? The case is simple, I have configured the topology and have connectivity between each PC and respective gateway. The problem is when I tried to ping a…
cgasp
  • 171
  • 1
  • 12
0
votes
1 answer

Router is continually broadcasting the same ARP request, with the exact contents

I hope the question is clear and that this is correct place to post the question. My router is broadcasting the same ARP frame over and over (once every second). It's probably not a big deal, but I want to understand what is going on here. The…
m4design
  • 103
  • 4
0
votes
1 answer

ARP issues across MAN

We have a large area MAN provided by a local cable company. Each location has a cable modem that connects directly back to a central location, i.e. it doesn't cross the internet, it is a private connection. Each out building shows shows up at the…
Kerry Hatcher
  • 139
  • 5
0
votes
1 answer

Why is a ping response being sent to the wrong gateway?

In a previous question, I was trying to determine why my OpenVPN clients could not ping the server LAN, even though the server LAN could ping the clients. Having investigated this further, I determined that, at least in the case of one of the…
jonseymour
  • 243
  • 1
  • 4
  • 13
0
votes
1 answer

Linux storing arp cache entries using wrong interface

I'm trying to get two virtual machines (running CentOS) to talk to host (Ubuntu 10.04) using VDE and the outside network. So far I'm running into an ARP issue. On Host I have a physical eth0 and a virtual tap0 interfaces bridged by br0. All on the…
Dmitry Shvedov
  • 101
  • 1
  • 5
0
votes
1 answer

Adding entries for incoming arp requests to ARP cache?

Given a host A und B within the same broadcast domain whose ARP caches are both empty, under what circumstances would B add an entry for A to its ARP cache when replying to an incoming ARP request received from A? As far as I understand all the…
aka
  • 143
  • 1
  • 4
0
votes
1 answer

Many ARP requests in TCP dump?

I have been experiencing very slow upload speeds on my cable network lately. I ran a tcpdump and found many ARP requests. I'm not sure what process they are coming from, but could this be related to the slow upload speeds, and do these look "normal"…
chaimp
  • 105
  • 5
0
votes
1 answer

arp requests are sent continuously and my linux machine disconnected to the world

I have the following problem and really need your help I'm implementing a small server to receive request from client on port 18999(just sample) using TCP socket. When I tested my server by using a lot of requests from a tablet through a router, I…
sees
  • 9
  • 3
0
votes
2 answers

postgres fallback to standby server, switching ip address, clear ARP cache

I'm using a hot standby server for my postgres database. I've assigned a virtual ip address to the server. In case of a failure I'm switching the virtual ip from the master to the hot standby server. The problem is, that clients accessing the db,…
markus
  • 1,050
  • 5
  • 18
  • 37
0
votes
2 answers

ARP requests, etc.

I'm trying to run arp spoofing on a network. I've been working on this for about a week, and all the information I find is dated year 2000-2001. My issue is, after testing a script that uses arpspoof on one network (worked fine, more or less), on…
smaslennikov
  • 196
  • 6
0
votes
1 answer

Sporadic routing(?) issues

We are running several virtual machines using KVM with libvirtd with a routed network (the host systems routes an extra subnet for the virtual machines). Host and Guest OS is Gentoo (host on amd64, guests on x86). The VMs are multi-homed with an…
ercpe
  • 566
  • 3
  • 15
0
votes
1 answer

Direct server return, ARP problem

I'm trying to implement Direct Server Return scheme for our web cluster and I think i got stuck with some ARP issues. For testing purposes I deployed 2 virtual servers (inside ESXi environment). Host A: eth0 10.0.0.1/24 (VIP) is our director with…
Paul Rin
  • 1
  • 1
0
votes
2 answers

Is a low-bandwidth arp-scan potentially disruptive to persistent TCP connections on the same LAN?

First a little background: On the (isolated) /16 LAN in question, we have several devices that keep several persistent TCP connections open between them. The program at each end of these TCP connections sends a "heartbeat" packet to its partner…
Jeremy Friesner
  • 1,311
  • 1
  • 14
  • 25
0
votes
3 answers

Is this how ARP works?

A wants to send a datagram to B. A knows B's IP address. However B's MAC address is not in A's ARP table. So A broadcasts an ARP query packet to all machines on the LAN. B recognizes it's IP, so it responds by sending A it's MAC address. Is this how…
Wintermute
  • 355
  • 1
  • 5
  • 12
0
votes
1 answer

ARP request are sent even though windows has an entry in cache (ARP Table)

we have a product which runs on windows XP embedded SP1. We add a fake(does not exists) MAC address for a fake IP in ARP table. When there is a communication happening Windows sends packets to the fake MAC and fakeIP and later we change it to real…
Ratnesh Maurya
  • 101
  • 1
1 2 3
…
27 28