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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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network issue when pinging hosts of the same lan [migrated]

I have two hosts on the same network: Kali which is on VirtualBox as guest; eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 ether 08:00:27:48:45:25 txqueuelen 1000 (Ethernet) ...
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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.
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ARP table not updated until response is sent

I'm executing the arp -a command on CentOS 7 in order to translate an IP address to a MAC address (since I can't access the source MAC of the layer 2 frame in Java). I see a lot of cases where the ...
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VPN Router does not reply to ARP Requests

So i have these three network interfaces setup on a linux box: eth0 is facing the external network (192.168.1.0/24) tun0 is the vpn interface (10.8.8.0/24) eth1 is the local network interface (...
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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 ...
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Weird answer of linux DHCP server to gratitious ARP causes DHCP failure

This is a problem, that I ran into recently on a quite heavily configured linux server. This machine runs Samba as an Active Directory Domain Controller, a mail server, a web server, two virtual ...
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How do I add a persistent static ARP entry to an AIX server?

How do I add a persistent static ARP entry to an AIX server? /> uname -a AIX CBDIS 3 5 000B8886D700 /> uname -v 5 /> uname -r 3 />
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Get-NetNeighbor for other routers in various sites (Determining active devices connected)

First post here, usually partial to StackOverflow, but this isn't exactly code related so I figured I'd drop here. I'm looking to get the arp table of routers within our network at various sites. I'm ...
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Physical interface MAC send an ARP reply instead of the virtual

I have a similiar problem as described here. I want to achieve, that my virtual interface does a arp response and the other hosts on the subnet have the virtual mac address in their arp cache, not the ...
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40 views

Martian source messages on most of the servers inside a network

On Ubuntu 16.04 and 18.04 servers, in the /var/log/syslog file, there are often Martian source messages like: Aug 23 06:42:51 scilit-solr kernel: [5417098.171549] IPv4: martian source 255.255.255.255 ...
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Cannot ping specific DVR on network

I have a WatchGuard firewall as our firewall/router, windows server 2008 R2 standard for DHCP, 2 windows 10 machines and a Hikvision DVR. Machine 1 could see the cameras no problem for about a week ...
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iptables, filter pkttype broadcast, ARP and ICMP

I found a brief explanation of this filter. https://www.netfilter.org/documentation/HOWTO/netfilter-extensions-HOWTO-3.html 3.10 pkttype patch This patch by Michal Ludvig adds a new match ...
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New computers can't connect to the network

Good Morning, We have a business environment in which we have 3 Cisco 3850 PoE stacked and We manage our DHCP through our DC server. Last weekend our UPS had a failure and switched off all outputs, ...
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ARP and multicast destination address

My server receives (as other hosts on the subnet) multicast requests from some other host. I expect to see the host's address in the ARP table (arp -a) but I don't see it. If the same host ...
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237 views

possibly excessive arp traffic related to network slowdown

I was looking into reports at one of my customers that the "network" was slow. (File access/saving/image loading from the server taking longer than than it usually does). The basic setup is a ...
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Does Loopback able to support all TCP/IP protocols

Does a Windows loopback adapter supports ACD and duplicate IPs. Say we have a code that supports full TCP stack and we bridge the program to loopback using PCAP. If in case I set both the address ...
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Windows Loopback adapter not participating in local network

I have created a Windows loop back adapter with 'Obtain IP address Automatically' enabled. ipconfig /all Ethernet adapter LL Address: Connection-specific DNS Suffix . : Description . . . . ....
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Why didn't an ubuntu host show up when pinging broadcast?

According to this question, I can ping broadcast and then parse the arp table to detect hosts on the LAN ... except that I have a fresh install of Ubuntu 16.04.4 LTS desktop that doesn't show up when ...
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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 ...
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How does ARP resolution work on Windows

This question was originally posted on the Network Engineering SE site, but closed for being off-topic. I've stumbled upon a peculiar behavior of Windows hosts in our network. Our clients are mostly ...
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Keepalived Gratuitos ARP

Is there any way in keepalived v1.4.4 to stop sending Gratuitous ARP for specific instance? I need that because upstream L2 ISP is forbidding us to send such frames. I tried with this config: ...
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Preventing ARP reply messages for IP address from unauthorized port/mac

I have a number of servers running on Dell switches which are used by clients for their projects. Occasionally some clients put other client IP addresses on their server (presumably by accident) and ...
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Which other tools to use if PING fails

I have checked this question and I understand the use of traceroute, but I do not understand why I should use ARP if PING fails. Details: I use Linux machine to ping the servers out of which some ...
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ARP request for itself

I have two IPs assigned to the same interface (host A): 3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000 link/ether a4:bf:01:24:f8:7c brd ff:ff:ff:...
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In pfsense arp entries are not populating in arp table for some host machines

In pfsense arp entries are not populating in "arp table" for some host machines. due to which internet is not working on host,which have dhcp assigned ip address. when I give a static IP address to ...
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How to add ARP entry for an entire subnet?

I would like to add ARP entry for an entire subnet (10.50.0.0/16). I tried : arp -v -i p4p1 -s 10.50.0.0 MAC_OF_P4P2 netmask 255.255.0.0 pub But the command returns: arp: SIOCSARP() SIOCSARP: ...
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A faulty printer doesn’t respond to ARP requests. How to spoof it from a Linux router?

I have this silly printer that will answer to ARP only once in a while (relatively rarely, sometimes one has to wait 5 minutes to get a connection). However when I add its MAC manually to the ARP ...
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Nmap/ARP queries giving same MAC address for all computers in subnet

Every time I run a scan on the computers in this network I’ll get their correct host names and open tcp ports and everything, but every single one shows like they have the same MAC address. I’m not ...
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How to use interface for KVM from ISP?

i have main IP: 1.2.3.4 with mask 255.255.255.0 and gateway 1.2.3.254 It is ok. Also, ISP gave me network /28. List of ip: from 1.1.1.1 and until 1.1.1.15 I can use these interfaces via aliases, ...
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Windows 10 hosts ARPing for WINS server in remote network

Our Win10 hosts are located in IP network 172.16.0.0/21. The (remote) WINS server is located in IP network 192.168.1.0/24. Running Wireshark on one of the hosts in 172.16.x.x I can see the entire ...
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Redirect tested app taffic

I need to perform some tests on an Android app which is connecting to REST server. unfortunatelly I can't currently connect to it test server, so I thought I'd start the web service on my computer and ...
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Juniper SRX refuses to add new ip addresses to ARP (unless)

I have a juniper SRX340 running as default gateway, I have a linux server (virtual machine actually) running debian 8. juniper ip: 192.168.1.1 Debian ip: 192.168.1.101 (eth0) I would like to add ...
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ARP broadcasts even when found in local cache

I have few win2012 servers that I just discovered ARP broadcasts are being generated even though the entries are found in it's local arp cache. My understanding is that if it's already on the servers ...
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Multiple ARP Spoofers on a network

We know that when an ARP spoofing process is running on a network, all of the network traffic will be routed through it before it travels to its true destination. But what happens if I have 2 ARP ...
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ARP responses from host with several interfaces

I have a (experimental) setup where a host myhost.mydomain has three network interfaces all connected to the same VLAN as its default gateway mygateway.mydonain. The setup looks as follows: interface ...
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Can ARP expire mid iperf connection?

If one runs an iperf connection between a node 'A' and a node 'B' is it possible that the arp entry expires from one of the nodes. [I have a simple mininet topology and while running an iperf ...
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Set up bridged vxlan network in linux

I'm trying out vxlan with linux, and this problem has kept me stuck for days. Simple Vxlan works fine Simple vxlan with muticast works for cross-host communication, this simply create a vxlan vtep ...
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wierd arp issue with 2 interafces sharing same subnet

I have two linux machines connected through a switch. bothe machines run linux RHEL 7.3 kernel 3.10.0-327.el7.x86_64 one of the machines is connected with both ports to the switch and the other with ...
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Cisco 877 doesn't respond to IP determined through ARP

I have just obtained an old Cisco 877. I made sure to first push the reset button in the back. I then plugged into one of the LAN ports. The device gave me an IPv4 address (169.254.14.65/16) and an ...
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ARP is running in the local network

This issue started when our third party support changed the subnet of our network since there are few IP addresses left. All of our workstations here are currently running on Windows 7 64-bit and now ...
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231 views

Disable all gratuitious ARP, TCP & HTML queries Windows 7

We have a machine controller running Microchip firmware worked 100% with LINUX computers for 14 years via LAN (eth0). Now have requirement to run using Windows 7. Unfortunately Windows sends out a ...
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How to modify Socket Close time for Unreachable IP on Windows?

First of all, please look this question to understand what I mentioned. When I try socket close in windows OS for unreachable IP with UDP, I got the three-second delay. As you can see from the ...
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Linux transparent bridge: dhclient kills all traffic

I'm encountering a very odd situation with Hypriot OS. Network configuration: +--------+ +------+-----+------+ +---------------------+ +-------+ + laptop +--+ eth0 + br0 + eth1 +--+ router @ 10....
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how to answer a who has arp request

Ok this is a stupid question i know, but bear with me. I started a new job and the networking is terrible, there are a bunch of dumb switches on top of dumb switches. We are running a 10. network ...
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Ethernet switch forgets me too soon

My workstation is connected to one of the corporate ethernet switches. There are multiple VLANs. ipv4 broadcast and ipv6 FF02::1 only work within current VLAN. I have enabled wake on lan and waking ...
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CentOS 6. Three NICs, Three Subnets, Non Converged Network and ARP requests

I couldn't find any existing questions that fit mine so I hope this is not a duplicate but I have some rather strange behavior. I have this same set up running on Oracle Solaris (SPARC) without this ...
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WINDOWS 2012R2 Server - edit arp cache default timeout values

I'm trying to edit / change the default duration of the ARP cache entries stored in a Windows 2012R2 server TCP/IP stack (for IPv4 entries). I've tried to edit the following OS registry keys: -"...
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Same network, two interface cards, hosts behind different networks

Can anyone help with this? I have a gadget that has a fixed IP address 10.0.0.2, which I cannot change. It needs to talk to my laptop, which in turn needs to talk to the internet. My main network ...
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Why does Linux answer to ARP on incorrect interfaces?

I have the following Linux networking setup: there is an eth10 network interface with the assigned address 10.11.0.1/24. Then there is a tap0 network interface with assigned dummy address 0.0.0.1/32 (...
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arp table doesn't show entry for macvlan interface after recent ping

Using Dedicated server. Main IP on eth0: 88.99.102.103 Default route: 88.99.102.65 Additional IP: 88.99.102.116 has MAC: 00:50:56:00:C4:6E Creating macvlan interface: ip link add link eth0 mac0 ...