I'm trying to use HAProxy as a fully transparent proxy using TPROXY in Ubuntu 14.04. HAProxy will be setup on the first server with eth1 111.111.250.250 and eth0 10.111.128.134. The single balanced server has eth1 and eth0 as well. eth1 is the public facing network interface while eth0 is for the private network which both servers are in.
Problem: I'm able to connect to the balanced server's port 1234 directly (via eth1) but am not able to reach the balanced server via Haproxy port 1234 (which redirects to 1234 via eth0). Am I missing out something in this configuration?
On the HAProxy server
The current kernel is:
Linux extremehash-lb2 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:11:08 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
The kernel appears to have TPROXY support:
# grep TPROXY /boot/config-3.13.0-24-generic
CONFIG_NETFILTER_XT_TARGET_TPROXY=m
HAProxy was compiled with TPROXY support:
haproxy -vv
HA-Proxy version 1.5.3 2014/07/25
Copyright 2000-2014 Willy Tarreau <
[email protected]>
Build options :
TARGET = linux26
CPU = x86_64
CC = gcc
CFLAGS = -g -fno-strict-aliasing
OPTIONS = USE_LINUX_TPROXY=1 USE_LIBCRYPT=1 USE_STATIC_PCRE=1
Default settings :
maxconn = 2000, bufsize = 16384, maxrewrite = 8192, maxpollevents = 200
Encrypted password support via crypt(3): yes
Built without zlib support (USE_ZLIB not set)
Compression algorithms supported : identity
Built without OpenSSL support (USE_OPENSSL not set)
Built with PCRE version : 8.31 2012-07-06
PCRE library supports JIT : no (USE_PCRE_JIT not set)
Built with transparent proxy support using: IP_TRANSPARENT IPV6_TRANSPARENT IP_FREEBIND
Available polling systems :
epoll : pref=300, test result OK
poll : pref=200, test result OK
select : pref=150, test result OK
Total: 3 (3 usable), will use epoll.
In /etc/haproxy/haproxy.cfg, I've configured a port to have the following options:
listen test1235 :1234
mode tcp
option tcplog
balance leastconn
source 0.0.0.0 usesrc clientip
server balanced1 10.111.163.76:1234 check inter 5s rise 2 fall 4 weight 4
On the balanced server
In /etc/networking/interfaces I've set the gateway for eth0 to be the HAProxy box 10.111.128.134 and restarted networking.
auto eth0 eth1
iface eth0 inet
static
address 111.111.250.250
netmask 255.255.224.0
gateway 111.131.224.1
dns-nameservers 8.8.4.4 8.8.8.8 209.244.0.3
iface eth1 inet
static
address 10.111.163.76
netmask 255.255.0.0
gateway 10.111.128.134
ip route gives:
default via 111.111.224.1 dev eth0
10.111.0.0/16 dev eth1 proto kernel scope link src 10.111.163.76
111.111.224.0/19 dev eth0 proto kernel scope link src 111.111.250.250
