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• Multicast in private LAN with different subnets

  - by Gobliins

  after i read Multicast IP Addresses and Multicast accross the subnets I am confused. Configuration: I have two devices in the same network. They may not be in the same Subnet, but always in the same physical network (beyond the same router, switch etc.) I want to communicate across IP multicast either 224.x.x.x or 239.x.x.x may be more fitting because we want it local, not beyond of forward through the router. Can one machine be the receiver and the other machine sender of the same multicast address? and can the receiving machine send an answer to the sending machine?

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• debian installation without internet connection

  - by Gobliins

  Hi i want to install some Debian distributions (Grip, Crush, Lenny...) for arm / armel architectures. www.emdebian.org/ i refer to this guide www.aurel32.net/info/debian_arm_qemu.php The Problem i have is that i dont have internet connection with My Linux VM or Qemu i am behind a Proxy. I want to know is there a way where i can dl all the needed files and save them to disk that i don´t need an i.c. during the installation? I am working under Windows now. my regards

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• arp across subnets which devices can be detected?

  - by Gobliins

  i have some devices connected in the same physical network (LAN) but in different subnets. I want to detect them all with the ARP from my computer. My Computer is also in the same physical network but on a different subnet. ! The devices have no arp protocol installed (yet). Is it possible to detect the devices (with or withour ARP installed on every device)? If the devices have a MAC-address but no IP-address, can ARP still detect the machines?

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• Protocol (or service publish/discovery) to detect devices in network

  - by Gobliins

  we connect some embedded devices in a network. What i am looking for now, is a way to find the devices IP and identify them. We work with Windows PC´s and i am about to write a C# tool that should do this. I thought about send a udp broadcast and in the ack i.e. is the device´s ip, which would mean the device needs a daemon runnig to assign an ip itself. Running a service (like a printer) on the device, and on the PC just lookup for the service. I read about some things like apipa, zeroconf, ipv4 local link, bonjour, dns-sd, mdns, bonjour; They can automatically assign ip´s and publish services in a network. My Question is, can someone recommend me what would be good for my task? -The protocol or Service should be low on ressource (memory/cpu usage) use. -Are there some standard protocolls to use? -Is DNS a good idea or would it be to ressource consumpting just for finding a device´s IP? -Should also work when no dhcp servers are around. edit: To clarify a bit: The IP configuration is automatic. The problem to focus is how to tell the PC which IP in the network (or a direct connection in this vase there would only be one) belongs to the device (identity).

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