Otdfbt

Alright so I have a server box with HAProxy installed and I need it to forward traffic to two MySQL servers. They are both located in completely different datacenters. It works when I have this removed from the config:
source 0.0.0.0 usesrc clientip
However, when enabled I can't get a response from the MySQL servers.

I have these IPTables rules on the HAProxy server:
iptables -t mangle -N DIVERT
iptables -t mangle -A PREROUTING -p tcp -m socket -j DIVERT
iptables -t mangle -A DIVERT -j MARK --set-mark 111
iptables -t mangle -A DIVERT -j ACCEPT
ip rule add dev eth0 fwmark 111 lookup 100
ip route add local 0.0.0.0/0 dev lo table 100

And no connection can be made. However, when I add this:
iptables -A POSTROUTING -t nat -j MASQUERADE

It works but the client IP is not being sent, just the proxy IP.

The MySQL servers are configured to have the HAProxy server's ip as their default gateway.

I'm not sure if this is even possible, I've been messing with this for days.

My HAProxy config:

global
 log 127.0.0.1 local0 debug
 daemon

defaults
 log global
 retries 2
 #option dontlognull
 option tcp-smart-accept
 option tcp-smart-connect
 option tcplog
 option log-health-checks
 timeout connect 3000
 timeout server 5000
 timeout client 5000

frontend mysql-frontend
 bind 100.111.111.111:3306 transparent
 default_backend mysql-backend

backend mysql-backend
 mode tcp
 source 0.0.0.0 usesrc clientip
 option mysql-check user haproxy_check
 server mysql1 192.111.111.111:3306 check
 server mysql2 200.111.111.111:3306 check

Route tables for one of the MySQL servers:

Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 100.111.111.111 0.0.0.0 UG 2 0 0 eth0
100.111.111.111 0.0.0.0 255.255.255.255 UH 2 0 0 eth0
192.111.111.0 0.0.0.0 255.255.255.0 U 0 0 0 eth0
127.0.0.0 0.0.0.0 255.0.0.0 U 0 0 0 lo

Sysctl for the HAProxy box:

net.ipv4.ip_forward = 1
net.ipv4.conf.all.forwarding = 1
net.ipv4.conf.all.accept_redirects = 1
net.ipv4.conf.all.send_redirects = 1
net.ipv4.conf.eth0.send_redirects = 1
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.conf.default.rp_filter = 2
net.ipv4.conf.default.accept_source_route = 0

The TProxy module is also compiled into HAProxy, and the required kernel modules are enabled as well.

There is also only one interface, eth0.

Please let me know what I'm doing wrong, or if this is even possible!

Thanks!

Transparent mode requires that the haproxy be the default gateway of the backend servers. Remote servers won't work.