Basic transit problem in two node setup

Hello Community
I have a problem, the traffic will no pass the HAProxy:
The configuration is based on two HAProxy’s with two nics of each.

A dump shows me input traffic but no output traffic.

frontend fe1
    bind, interface eth1
    mode tcp
    default_backend be1
backend be1
    mode tcp
    balance roundrobin
    server s1:80 check
    server s2:80 check backup

the virtual ip’s are deployed via pacemaker ipaddr2 between two HAProxy nodes.

Backend adresses
HAProxy-1 : eth0 :
HAProxy-2 : eth0 :
defaulroute looks to eth0

Frontend adresses
HAProxy-1 : eth1 :
HAProxy-2 : eth1 :

As a local firewall i use nftables without nat. Drops will be logged, there are no drops.

Is there any nat or explicit routing needed if i want to hide the be-pool servers from the clients.
And the pool servers have to speak with the backend ips on eth0.

So the traffic comes like this : Client <> eth1 eth0 <> pool servers

Is here anyone to help me to fix my problem. And yes a part of the problems can be are not explicit HAProxy configuration. I’m not sure…

net.ipv4.ip_nonlocal_bind = 1
net.ipv4.conf.all.log_martians = 0
net.ipv4.conf.default.log_martians = 0

Cheers Dave