Cross docker networks communication

General
1

I’ve created 2 docker networks using docker network create. Docker daemon created a linux bridge for each of the networks.
I’m trying to redirect traffic from one network to the other using some dpdk process, which listens to one bridge and redirects to the other bridge.

Anyway, I couldn’t do it due to Docker daemon changing iptables rules.
Specifically adding these isolations,

DOCKER-ISOLATION-STAGE-2  all  --  br-d6ffb947525f !br-d6ffb947525f  0.0.0.0/0            0.0.0.0/0

Drop whatever sent to this network, not from this network.
Which is exactly what I wanted to do.

Is there a nice way to overcome this issue with proper docker syntax (something with docker network create options) and not using iptables(for example, allow all FORWARDs

Chain FORWARD (policy DROP 0 packets, 0 bytes)
pkts      bytes target     prot opt in     out     source               destination         
   0        0 ACCEPT     all  --  *      *       0.0.0.0/0            0.0.0.0/0           
  831064 395982253 DOCKER-USER  all  --  *      *       0.0.0.0/0            0.0.0.0/0           
  831064 395982253 DOCKER-ISOLATION-STAGE-1  all  --  *      *       0.0.0.0/0            0.0.0.0/0        
...   

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
pkts      bytes target     prot opt in     out     source               destination         
  317527 13466097 DOCKER-ISOLATION-STAGE-2  all  --  br-3f2a8e428fc3 !br-3f2a8e428fc3  0.0.0.0/0            0.0.0.0/0           
    4985   222873 DOCKER-ISOLATION-STAGE-2  all  --  br-d6ffb947525f !br-d6ffb947525f  0.0.0.0/0            0.0.0.0/0    <-------
    9867   414498 DOCKER-ISOLATION-STAGE-2  all  --  docker0 !docker0  0.0.0.0/0            0.0.0.0/0           
  926051 544265081 RETURN     all  --  *      *       0.0.0.0/0            0.0.0.0/0           

Chain DOCKER-ISOLATION-STAGE-2 (3 references)
pkts      bytes target     prot opt in     out     source               destination         
 626    43802 DROP       all  --  *      br-3f2a8e428fc3  0.0.0.0/0            0.0.0.0/0           
 139    11616 DROP       all  --  *      br-d6ffb947525f  0.0.0.0/0            0.0.0.0/0           
   0        0 DROP       all  --  *      docker0  0.0.0.0/0            0.0.0.0/0           
  357775 15136265 RETURN     all  --  *      *       0.0.0.0/0            0.0.0.0/0