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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2 NICs 2 IPS same subnet

I am setting up a SUSE 11 box that has two NICs: eth0 - 192.168.10.150/24 - 00.0C.29.DC.10.CA (MAC) eth1 - 192.168.10.151/24 - 00.0C.29.DC.10.DE (MAC) I need both in the same subnet since they will ne connected to another device (storage) point to…
karlochacon
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Strange linux neighbor cache entries (whole-world-is-link-local syndrome) (linux 3.0.0-16)

On absolutely standard ubuntu-server linux distro running only BIND cache, sometimes i see non-link-local ip addresses in the arp/nei table and there is no way to communicate with those entries After googling for most of the morning, i did not find…
jackdoe
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Why does a PXE-booting VM aggressively seek Reverse ARP?

Reverse ARP is.. well, pretty much dead, as far as I'm aware? One of the great Internet success stories in killing off a protocol? It's been deprecated in favor of BOOTP (and later, DHCP) for almost three decades. So, I was a little surprised to…
Shane Madden
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How to setup a static multicast ARP entry with Cisco SG300?

We're running a Microsoft NLB cluster in multicast mode as a loadbalancer. Using our old Cisco IOS switches we propagate access to the cluster to our branches using a static ARP entry in the core router: arp 10.20.1.226 03bf.0a14.01e2 ARPA But how…
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Why is my Nexus 5548UP not adding ARP entries for the trunk to a 2960S?

I have a Nexus 5548UP trunked to a Catalyst 2960S. I have verified that spanning tree is working. I explicitly made the 2960S the root bridge for all VLANs as a temporary measure since it is trunked to an ASA for inter-VLAN routing (router…
Alain O'Dea
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ARP discovery on multiple subnets

I have an unmanaged switch which serves traffic belonging to different subnets. Lets say these are the subnets: 192.168.0.0/24 192.168.1.0/24 192.168.2.0/24 And few more subnets which I am not aware of. I have a Linux machine having 192.168.0.1 as…
nixnotwin
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Multi-NIC Linux machine's NICs are responding to each other's ARPs regardless of arp_filter setting

I have an old Linux machine running a 2.4.37 kernel. In the machine are two NIC cards both on the same network with different IPs. For some testing, we want each IP's traffic routed through that NIC, but what is actually happening is all the traffic…
bk.
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Solaris does not record MAC address in ARP table

I have noticed that a Solaris 9 server keeps sending ARP requests for an IP address that is owned by our DNS server. The DNS server answers with its MAC address but Solaris 9 does not record the address in the ARP table. You can ping the DNS server…
gtirloni
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arp table filling up

I have a CentOS 5 system which serves as an IPSec VPN connector between my network and a couple of remote networks. Lately it is running into this problem once or twice a day where its ARP cache gets filled up. The local network on which this guy…
MK.
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Is there a config file for ubuntu server like /etc /ethers to config the mac-ip bind?

i can't find /etc/ethers in ubuntu server:< i want save something like "sudo arp -s someipaddress macaddress" so i don't need to set it again after reboot
shadowlin
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Effects of having a rapid ARP flush

So the scenario is we have a web server at our colocation. In front of that web server are two SonicWalls and two L2 non-stacking managed switches. We're trying to find an efficient way to set up redundancy on all levels here (router, switch,…
Safado
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Need confirmation on layer 2 security question

I need confirmation on a question regarding layer 2 security. I've been doing research and I just need to know that I understand it correctly. Basically, if you have a LAN with a few machines connected to a switch, and those machines are…
Mediocre Gopher
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Is it possible to disable ARP in Windows 7

I have a unique requirement where I need to disable ARP on a Windows 7 box. In previous Windows versions you could modify the ArpRetryCount in the registry (and set it to 0), but this does not work in 7 (nor does it exist). Does anybody know how, or…
DriverGuy
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Is there a way to trace what's sending gratuitous arps?

We have a box that's just started acting up and we're not really sure why. It has IP address (dummy examples) 199.199.199.1 on eth0, 127.0.0.2 on eth1, and 199.199.199.2 on eth1:0. Recently, for some reason, eth0 has started sending gratuitous arps…
KernelM
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Software to Generate False ARP Requests?

A product I'm testing appears to freak out when it receives an ARP request with a Sender IP Address of 0.0.0.0. This is not an ARP probe, as the request is addressed to my module, and the customer's system sends the request just before it starts…
Sam Skuce
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