id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
1543	"UDP proxy with ""proxy_protocol on"" resends empty udp packet"	dkovalen@…		"Good day.

I'm using stable nginx 1.10.2 from repository for CentOS 6.9.
I need to use nginx as tcp/udp proxy with proxy_protocol to retransmit client's IP to destination instead of proxy's IP.

Configuration part for tcp/udp proxy of nginx.conf is:

stream {
    server {
        listen 1234;
        proxy_connect_timeout 2s;
        proxy_timeout 10s;
        proxy_protocol on;
        proxy_pass dest.server:1234;
    }
    server {
        listen 1234 udp;
        proxy_connect_timeout 2s;
        proxy_timeout 10s;
#       proxy_protocol on;
        proxy_responses 0;
        proxy_pass dest.server:1234;
}}

TCP proxy works well, packets resends normally with 1st line ""PROXY IP1 IP2..."" but for UDP proxy resends only 1st line ""PROXY IP1 IP2..."" with empty UDP packet body.

If I uncomment the ""proxy_protocol on"" line in UDP proxy configuration, packets are resends normally with a non-empty body, but without the PROXY header that I need.

Line ""proxy_responses 0"" does not affect anything."	defect	closed	major		nginx-module	1.10.x	worksforme			Linux narodmon.ru 2.6.32-696.23.1.el6.x86_64 #1 SMP Tue Mar 13 22:44:18 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux	"nginx version: nginx/1.10.2
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-17) (GCC)
built with OpenSSL 1.0.1e-fips 11 Feb 2013
TLS SNI support enabled
configure arguments: --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/lib/nginx/tmp/client_body --http-proxy-temp-path=/var/lib/nginx/tmp/proxy --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/var/run/nginx.pid --lock-path=/var/lock/subsys/nginx --user=nginx --group=nginx --with-file-aio --with-ipv6 --with-http_ssl_module --with-http_v2_module --with-http_realip_module --with-http_addition_module --with-http_xslt_module=dynamic --with-http_image_filter_module=dynamic --with-http_geoip_module=dynamic --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_random_index_module --with-http_secure_link_module --with-http_degradation_module --with-http_slice_module --with-http_stub_status_module --with-http_perl_module=dynamic --with-mail=dynamic --with-mail_ssl_module --with-pcre --with-pcre-jit --with-stream=dynamic --with-stream_ssl_module --with-debug --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --with-ld-opt=' -Wl,-E'"