Hello folks,

I am trying to get the below load balancer config to work in our
environment. Basically, this server should receive v6 udp packets sflow
sample packets on port 6343 and forward out to these 3 servers part of
stream_backend. However, it doesn't seem to work. If I switch to v4, it
does work.


Can someone please let me know if I am missing something?




# * Official English Documentation: http://nginx.org/en/docs/
# * Official Russian Documentation: http://nginx.org/ru/docs/

user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log;
pid /run/nginx.pid;

# Load dynamic modules. See /usr/share/doc/nginx/README.dynamic.
include /usr/share/nginx/modules/*.conf;

events {
worker_connections 100000000;
}

http {
log_format main '$remote_addr - $remote_user [$time_local] "$request"
'
'$status $body_bytes_sent "$http_referer" '
'"$http_user_agent" "$http_x_forwarded_for"';

access_log /var/log/nginx/access.log main;

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;

include /etc/nginx/mime.types;
default_type application/octet-stream;

# Load modular configuration files from the /etc/nginx/conf.d directory.
# See http://nginx.org/en/docs/ngx_core_module.html#include
# for more information.
include /etc/nginx/conf.d/*.conf;

# server {
# listen 80 default_server;
# listen [::]:80 default_server;
# server_name _;
# root /usr/share/nginx/html;

# Load configuration files for the default server block.
# include /etc/nginx/default.d/*.conf;

# location / {
# }
#
# error_page 404 /404.html;
# location = /40x.html {
# }
#
# error_page 500 502 503 504 /50x.html;
# location = /50x.html {
# }
# }

# Settings for a TLS enabled server.
#
# server {
# listen 443 ssl http2 default_server;
# listen [::]:443 ssl http2 default_server;
# server_name _;
# root /usr/share/nginx/html;
#
# ssl_certificate "/etc/pki/nginx/server.crt";
# ssl_certificate_key "/etc/pki/nginx/private/server.key";
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 10m;
# ssl_ciphers PROFILE=SYSTEM;
# ssl_prefer_server_ciphers on;
#
# # Load configuration files for the default server block.
# include /etc/nginx/default.d/*.conf;
#
# location / {
# }
#
# error_page 404 /404.html;
# location = /40x.html {
# }
#
# error_page 500 502 503 504 /50x.html;
# location = /50x.html {
# }
# }

}

stream {
upstream stream_backend {
# least_conn;
server [2001:10:80:70::171]:6343;
server [2001:10:80:70::172]:6343;
server [2001:10:80:70::173]:6343;

}

server {

listen [::]:6343 udp;
# listen 6343 udp;
proxy_pass stream_backend;
proxy_timeout 3s;
proxy_connect_timeout 60s;
proxy_responses 0;
error_log /home/lab/sflow_lb.log;
# access_log /home/lab/nginx-access.log;
}
}
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