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Asked: 2026-06-06T07:46:14+00:00

I’m trying to write a server-client socket program in C. The objective is for

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I’m trying to write a server-client socket program in C. The objective is for the server to listen on a specific port, but across a range of IP addresses belonging to the same IP subnet. This IP subnet is part of the 127.x.x.x range (not 127.0.0.1 of course).

Couple of points to note:

  • This is a stream-based socket, and not Datagram sockets.
  • This is not a broadcast address.
  • Implementation in C/C++ only on Unix/Linux platform

I do not want to open multiple sockets on the server for each IP address in the range. This is not scalable.

Any help would be ideally appreciated. Is this even feasible?

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1 Answer

  1. Editorial Team

    You can only bind to one address on a single socket. Why can’t you bind to INADDR_ANY and simply reject any packets not bound for your target IPs? Alternatively, you could bind to an arbitrary port and use OS-level magic (e.g. iptables, bpf) to reroute packets destined for those IP/port combinations to your socket.

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