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
0
votes
1 answer

Cisco WAP321 dropping ARP packets

At my office we have 4 WAP321 connected directly to a Cisco 891f router. Randomly throughout the day, computers will lose access to the network. They will remain connected to the Wifi SSID, but can't ping any network resource. Not even the default…
inev
  • 1
  • 2
0
votes
1 answer

Cisco IPv6 Proxy-arp like IPv4

Can I disable the proxy-arp in IPv6 in Cisco? I cannot find the "no ipv6 proxy-arp" command in my Cisco router. Please teach me how to do it. Thanks.
tomli
  • 21
  • 5
0
votes
0 answers

why iptables SNAT doesn't help to answer ARP on the vlan tagged subnet?

I'm using iptables SNAT to setup a "router" on a linux box, it suppose to do NAT for 2 subnets. one untagged subnet 10.0.10.0/24, the other one is vlan tagged subnet 172.16.0.0/24. both subnet come from a switch to interface em2 on the linux box,…
user3016997
  • 303
  • 1
  • 2
  • 5
0
votes
0 answers

What causes the Linux neighbour table confirmation counter to be reset

Given three linux hosts on the same broadcast domain, the sender constantly pings an IP bound to receiver1. When moving the IP address from receiver1 to receiver2 it takes a quite long time for the ARP/neighbour cache to be invalidated on…
Michael Renner
  • 1,750
  • 13
  • 17
0
votes
1 answer

IPv6: I'm confused about addresses

I'm starting studying IPv6 and I'm having some troubles understanding some aspects. Let's clarify if I'm getting this right! A single host may have: - a unicast global address - a link local address Then it joins multicast groups, solicited node…
Umberto Manferdini
  • 1
0
votes
2 answers

arp table entry outside configured network

Can someone tell me why do I have arp table entry outside interface network? Server has 2 interfaces, both on the same network: eth0 10.10.34.146/22 eth1 10.10.33.188/22 ip route default via 10.10.32.2 dev eth0 proto static metric…
Vangass
  • 3
  • 3
0
votes
0 answers

ARP/ICMP in a network environment with overlapping IP address

Currently I have lab network setup to mimic customer's network deployment. (According to the customer, they are using VRF over VLAN so that their customer can have overlapping network connecting to the same server host). So abstract away all…
Kun
  • 1
0
votes
1 answer

Master and slave devices talking to each other through another device with two interfaces. All in the same network

I have three devices, one is a master which will talk with the slave and Device3 but it is only physically connected to the Device3. The slave will speak only with the master(also through the Device3). The third device is meant to be a gateway…
thelinuxlearner
  • 1
0
votes
2 answers

Is turning off ARP a common practice?

I'm just trying to diagnose a problem I and a colleague have had on two separate occasions to swap out an old router with a new one. Both starting from scratch, we've found that we can't seem to get the router to ping the remote router even when…
hookenz
  • 14,472
  • 23
  • 88
  • 143
0
votes
1 answer

Polycom VOIP phone seems to mask the secondary device's MAC address from a Cisco switch

When I have a Polycom VOIP phone plugged into a Cisco switch and a laptop plugged into the Polycom phone I get the following. 1) The phone goes into the voice VLAN as expected. 2) The laptop goes into the data VLAN as expected. 3) When I run show…
Boris Epstein
  • 75
  • 5
0
votes
4 answers

Fault tolerance by using two IP with two interfaces

I would like to have a fault-tolerant setup for http requests. For brevity, let's assume we have a very simple Web-service and there is no difference which server responses. So I will have the following setup (all three are in the same…
maniaque
  • 730
  • 2
  • 6
  • 13
0
votes
1 answer

Cisco ASA 5510 needs "clear arp " periodically to reach a single host

ASA 9.0(3) The symptom is that I can ping from the ASA to any other host in that interface's subnet, save one particular host (that host can ping the interface on the ASA however). If I do "clear arp FooInterface" I'll be able to ping the host for a…
Graham Dunn
  • 56
  • 1
  • 5
0
votes
1 answer

iptables: service per physical interface

I have a vm on which I'm trying to configure (unsuccessfully) one service per physical device - i.e. ssh open only on eth0, http only on eth1 and ftp only on eth2. This has to happen regardless on the physical device configuration so for example it…
pba
  • 11
  • 1
0
votes
2 answers

Why am I not getting an ARP reply with this request?

Using pcap_sendpacket in C, I'm manually sending the following packet on wlan0 (I've left out some fields, but I think they are correct): (Ethernet layer) eth src: eth dest: (ARP request…
Brandon
  • 136
  • 1
  • 2
  • 7
0
votes
1 answer

How can I tell what's happening to my packets?

I'm trying to bring up a little box on my network. I just reflashed the firmware and it's supposed to come up as 192.168.1.1 by default. My router is a DSL modem at 192.168.0.1; it usually uses a netmask of 255.255.255.0, so I can't talk to the new…
Adam Bliss
  • 131
  • 5
1 2 3
…
28 29