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Questions tagged [so-reuseport]

13 questions
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Python (3.8.12) UDP sockets does not distribute packets when SO_REUSEPORT option is set (Linux 3.10)

When looking at python UDP sockets option 'SO_REUSEPORT', I found something strange. According to the article, How do SO_REUSEADDR and SO_REUSEPORT differ?, 'Additionally the kernel performs some "special magic" for SO_REUSEPORT sockets that isn't…
Victor Windy
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syscall.SO_REUSEPORT not available in net package

I want to open multiple UDP sockets bound to the same port( say 8888). The different sockets will be bound to different vrfs in the system. What I understand is we need to set SO_REUSEPORT sockopts, but I don't see this available in net package of…
Saurabh Suman
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how to create multiple UDP Datagram channels/streams on same local/src address

I have to receive data from diff clients on same port of server. I want to create separate channels for each client for this purpose and receive data on each of them. I am exploring all the options available to design this. Option 1 : Listen on a…
Onki
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Get UDP packets from the same client delivered to the same server process, when using SO_REUSEPORT?

I'm writing a multi-process UDP server, which uses SO_REUSEPORT to let multiple worker processes listen on the same port. Is there a way of telling the kernel that I would like consistent delivery of packets to processes, based on the packets'…
fadedbee
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How to load value from memory into accumulator in bpf

I want to write a bpf program which return [1,n] in round-robin pattern. e.g if n=4 then it should return 1,2,3,4,1,2,3,4,1,2.. Algorithm for above idea is: A = read M[0] A = A % n-1 A = A+1 store M[0] = A return A Apart from first step,…
Upendra Kumar
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Collocating mutiple services on the same UDP port

Say, there are 2 services (A and B) bound to listen onto the same UDP port. service A employs SO_REUSEPORT socket option and service B doesn't. Is there a way to make both services to work together on the same ip/port? Specifically, would it matter…
Dmitry
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can i attach bpf program to all socket binding on same ip:port using so_reuseport

From Linux manual page About so_attach_cbpf For use with the SO_REUSEPORT option, these options allow the user to set a classic BPF (SO_ATTACH_REUSEPORT_CBPF) or an extended BPF (SO_ATTACH_REUSEPORT_EBPF) program which defines how packets are…
Upendra Kumar
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SO_REUSEADDR just make sense for server?

I am working with two binaries which use UDP sockets. Process A waits for messages on a UDP socket (IP_1:PORT_1) by select(), and process B eventually sends through an UDP socket. By some constraints out of scope, process B needs to send by a socket…
Javi
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SO_REUSEPORT and multiple listeners in the same thread

Background references... https://lwn.net/Articles/542629/ https://blog.n0p.me/2018/02/2018-02-20-portsharding/ I'm curious how well this feature performs with multiple listeners on the same thread? For example, suppose my server enforces a limit of…
user1715587
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gRPC Java server with setReuseAddress(true)?

I am working on a gRPC server written in Java. It uses NettyServerBuilder to start/run the server. I am wondering, how to set setReuseAddress(true) for the server, so that it can restart quickly (either on crashes or maintenance restarts.) This is…
JaM
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how to connect to specific grpc server process under so_reuseport

I have multiple GRPC servers, all bounded to the same port using GRPC linux so_reuseport option. This works great but for health checking I would like to iterate on all servers, one by one and identify unhealthy servers. Because they are all have…
Lior Cohen
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SO_REUSEPORT on UDP is not working as expected when listening on same port from 2 different processes

I am very new to socket programming. I am trying to subscribe to (listen on) same port from 2 different processes. Not working as expected. I started two server programs on seperate windows and then started the client program. Only one server…
Preethi
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Not able to attach so_reuseport_cbpf in cpp

Below BPF prgram in cpp is throwing error when binding to udp socket using SO_ATTACH_REUSEPORT_CBPF struct sock_filter code[] = { {BPF_LD | BPF_MEM, 0, 0, 0x00000000}, // load memory to accumulator //{BPF_ALU | BPF_ADD, 0, 0,…
Upendra Kumar
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