We are replacing a "RF modem + Router system" with a Software Defined Receiver. After analyzing the receiving and sent signals we found out that an IPv4 UDP packets have been sent and received. The packets have a source IP like: and the destination IP changes (its sometimes and sometimes broadcast Now the "Software Defined Receiver" is placed inside a PC. As we don't have a router anymore how can we send the obtained IP packets to the destination IP's or broadcast?

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    – Ron Maupin
    Commented Dec 31, 2020 at 4:22

3 Answers 3


You don't need a router if the traffic is sent to IP's within the same subnet. As long as the subnet mask is the same for all hosts in the network they will listen to the broadcast IP and will respond to ARP requests.

  • That is exactly my problem. I have the IP Packet inside the PC. Now how should I send it to the network? If I open a socket and send it it will add some overhead. In short,we don't know how to send it as it is programmaticaly.
    – Kurtul
    Commented Jul 1, 2019 at 12:37
  • I can't really help you with any custom software stuff, you would need to throw the packet into the tcp stack with something but it sounds like out of scope question for network engineering.
    – Elias
    Commented Jul 1, 2019 at 12:43
  • Is there something like a SW Router?
    – Kurtul
    Commented Jul 1, 2019 at 13:48
  • @Kurtul - there are SW routers, or you can just use a Linux box with IP forwarding.
    – Nathan L.
    Commented Jul 1, 2019 at 16:46

You don't need a router to move traffic within the same subnet, that's all layer 2 transport with MAC addresses resolved with ARP.

There are software routers out there-- you could also use a small Linux VM to act as a basic router. You can check out a tutorial here.


Traffic will move between layer2 segment only if traffic is in same subnet mac -address table is verified to destine traffic to destination .. whereas to move traffic in different subnet layer3 segment is taken into consideration ARP table and routing table plays key role to destine traffic to destination .

So make sure your software define by you fallow required parameters at layer2 and layer3 segments.

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