How to send/receive raw ethernet packets from `eth0` to `eth1`? - python-3.x

Question

I created a docker container and connected it to two bridge networks as:
# network 1
docker network create --driver=bridge network1 --subnet=172.56.0.0/24
#network 2
docker network create --driver=bridge network2 --subnet=172.56.1.0/24
docker run \
--name container \
--privileged \
--cap-add=ALL -d \
-v /dev:/dev \
--network network1 \
-v /lib/modules:/lib/modules \
container-image tail -f /dev/null
docker network connect network2 container
Then, I add a bridge NIC to connect eth0 to eth1 and add IP address to it:
# creating bridge NIC
brctl addbr br0
brctl addif br0 eth0
brctl addif br0 eth1
ifconfig br0 up
# adding IP address to br0
ip addr add 172.56.0.3/24 brd + dev br0
route add default gw 172.56.0.1 dev br0
Now, If I run ip addr, this is my output:
2: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
link/ether 02:42:ac:38:00:02 brd ff:ff:ff:ff:ff:ff
inet 172.56.0.3/24 brd 172.56.0.255 scope global br0
valid_lft forever preferred_lft forever
6773: eth0#if6774: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP group default
link/ether 02:42:ac:38:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 172.56.0.2/24 brd 172.56.0.255 scope global eth0
valid_lft forever preferred_lft forever
6775: eth1#if6776: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 state UP group default
link/ether 02:42:ac:38:01:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
inet 172.56.1.2/24 brd 172.56.1.255 scope global eth1
valid_lft forever preferred_lft forever
Now, I'm trying to send a raw ethernet packet by using scapy as:
from scapy.all import *
import sys
src_mac_address = sys.argv[1]
dst_mac_address = sys.argv[2]
packet = Ether(src = src_mac_address, dst = dst_mac_address)
answer = srp(packet, iface='eth0')
It sends the packet, but it would not be received by the other side. I checked the traffic by using bmon, So I see the packet coming out of eth0, but it is never going to be received by the eth1. Is something wrong here? I appreciate your help. By the way, I chose src and dst MAC addresses as: src_mac_address = 02:42:ac:38:00:02 for eth0 and dst_mac_address = 02:42:ac:38:00:02 for eth1.