Hi, I used the command line "arp -s IP MAC" command to set a static ARP entry on Windows Server 2003. When I ran "arp -a" it was there as a "static" entry. When I restart, it is gone. Is there some file somewhere like lmhosts where I can make this absolutely permanent? Thanks! ...
Are there common machines or OSs that will have problems connecting on a network where unicast ARP requests or broadcast ARP responses are not supported? I am providing a public Wi-Fi service, and considering blocking these types of ARP packet. Will this cause connectivity issues for contemporary clients? ...
Is there any way to send ARP packet on Windows without the use of another library such as winpcap? I have heard that Windows XP SP2 blocks raw ethernet sockets, but I have also heard that raw sockets are only blocked for administrators. Any clarification here? ...
I need to store persistent reference to third party device on an arbitrary IP network where the IP address of the devices may be static or randomly assigned by DHCP. I don't control the devices on the network and I can't rely on DNS and other ad-hoc networking protocols existing or working with the devices. So I have been instructed to ...
Hi there! Is there a way a send custom (and event undemanded) arp responses via shell (e.g. by hand or by a shell script) on MacOS X or any other UNIX? In addition, is there a way of making the software ask for the MAC representation for all IPs in the current subnet without sending pings the anyone? Thanks, Max ...
Is there a command line based way to send pings to each computer in a subnet? Like for (int i = 1;i < 254; i++) ping(192.168.1.i) to enforce arp resolution? ...
Imagine a user sitting at an Ethernet-connected PC. He has a browser open. He types "www.google.com" in the address bar and hits enter. Now tell me what the first packet to appear on the Ethernet is. I found this question here: http://stackoverflow.com/questions/177197/interview-questions-on-socket-programming-and-multi-threading As I...
I'm working on an installer project that consists of an MSI file and a bootstrap application that manages the prerequisites; and since the need for some of the prerequisites depends on what features the user chooses to install, the bootstrap app also provides the UI. I want to be able to force the Add/Remove Programs (or Programs and Fea...
We are looking at ways of creating a network effects server. By this I mean a central server that will inspect all the packets on the network and apply logic (drop, delay, alter, etc) based on factors external to the actual network such as weather and line-of-sight. This is all to do with running simulations of multiple real-world ent...
Currently we're parsing arp request output from the command line. string cmd = "arp -n "; cmd.append(ipaddress); cmd.append(" | grep "); cmd.append(ipaddress); fgets( line, 130, fp); fgets( line, 130, fp); ret.append(line); ... It works, but is there a way to do this using a library function that wont depend so much on the native com...
I am trying to figure out what devices are online and offline in our LAN. I've seen many programs doing a kind of graphical network overview, presenting LAN IP and MAC addresses. I would like to know if and how those (ARP?) information can be pulled from C#/.NET ? Any sample code snippets/links would be appreciated. ...
Hi, I'm working on a network security project and I noticed something that I can't explain: Why do we need a source hardware address field in arp? Isn't it already contained in the ethernet header? Cheers, Laurent ...
We have an application which is periodically sending TCP messages at a defined rate(Using MODBUS TCP). If a message is not received within a set period an alarm is raised. However every once in a while there appears to be a delay in messages being received. Investigation has shown that this is associated with the ARP cache being refreshe...
I'm working on an embedded device that connects on local network with RJ45 and when the system sends an ARP request to know the mac address of the gateway, no answer at all. If I clear the arp table on my Windows, the Windows asks exactly the same ARP request and got an answer! I sniffed the packet and the only difference inside the re...
Hi, i am new on iPhone development. I want to integrate wake on lan into my app without squeezing my users to enter the computers mac adress when the ip is already known. I googled for about some hours, take the source code of apples arp tool but i don't know howto manage this on iPhone. I am grateful for any help. Thanks! anthonyvage ...
I have a need for some C or C++ code, compilable under Linux, to be able to take a list of IP addresses of some arbitrary number of remote hosts machines and obtain a ethernet MAC address for each one. These host machines may be on the same subnet or they could be on a different subnet behind a router. Its OK if the MAC address of some o...
I'm looking for some Linux code to find an IP address from an Ethernet address. I suppose I have to do some inverse ARP trickery but I don't find any example... ...
Does DHCP use ARP only as communication protocol to assign an IP Address? ...
Hi, I'm working on a program that read arp cache from machine. I'm using Cocoa. There's a library called libdnet (libdnet.sourceforge.net) which has arp reading function. But I don't know how to write a code to use that function. Please help. ...
I'm currently trying to retrieve reachable neighbors from the arp table in a user space program written in c. I've looked through the source code to the "ip neigh" command (ipneigh.c) and it appears that I should use the flag NUD_REACHABLE to get the reachable nodes. However, when I look at the data returned from the kernel, I only hav...