Hi Mohammed,

I run a fresh devstack  (master branch) and making these assumptions:

- LB VIP is attached to tenant subnet IPv4 ( I also try giving --vip-network-id tenant) but the LB VIP is always getting LB VIP on IPv4 subnet
- Members are attached using the IPv4 address (ovn-provider doesn't allow mixing IPv4 and IPv6)


and then run these commands:

openstack network create tenant
openstack subnet create --subnet-range 192.168.100.0/24 --network tenant subnet1
openstack subnet create --ip-version 6 --subnet-range 2001:db8:0:1::/64 --network tenant subnet1ipv6
openstack router create r1
openstack router add subnet r1 subnet1
openstack router add subnet r1 subnet1ipv6
openstack router set --external-gateway public r1

openstack security group create sec1
openstack security group rule create --protocol tcp --dst-port 22 sec1
openstack security group rule create --protocol tcp --dst-port 80 sec1
openstack security group rule create --protocol icmp sec1

openstack server create --image cirros-0.6.2-x86_64-disk  --flavor m1.small --security-group sec1 --network=tenant --user-data 80.sh vm1 --wait
openstack server create --image cirros-0.6.2-x86_64-disk  --flavor m1.small --security-group sec1 --network=tenant --user-data 80.sh vm2 --wait
openstack server create --image cirros-0.6.2-x86_64-disk  --flavor m1.small --security-group sec1 --network=tenant --user-data 80.sh vm3 --wait

SUBNET1=$(openstack subnet show subnet1 -c id -f value)
SUBNET1IPV6=$(openstack subnet show subnet1ipv6 -c id -f value)

IPVM01=$(openstack port list --server vm1 -f json | grep ip_address | cut -d":" -f2 | sed 's/"//g' | tr -d ' ' | head -n 1)
IPVM02=$(openstack port list --server vm2 -f json | grep ip_address | cut -d":" -f2 | sed 's/"//g' | tr -d ' ' | head -n 1)
IPVM03=$(openstack port list --server vm3 -f json | grep ip_address | cut -d":" -f2 | sed 's/"//g' | tr -d ' ' | head -n 1)
IPVM03IPv6=$(openstack port list --server vm3 -f json | grep ip_address  | sed 's/"//g' | tr -d ' ' | sed -n 2p | sed 's/ip_address://g')

openstack loadbalancer create --name lb1 --vip-subnet-id subnet1 --provider ovn
openstack loadbalancer listener create --name listener1 --protocol TCP --protocol-port 80 lb1
openstack loadbalancer pool create --name pool1 --protocol TCP  --listener listener1 --lb-algorithm SOURCE_IP_PORT
openstack loadbalancer member create --name vm1 --address $IPVM01 --subnet-id $SUBNET1 --protocol-port 80 pool1
openstack loadbalancer member create --name vm2 --address $IPVM02 --subnet-id $SUBNET1 --protocol-port 80 pool1
openstack loadbalancer member create --name vm3 --address $IPVM03 --subnet-id $SUBNET1 --protocol-port 80 pool1

PORTVM3=$(openstack port list --fixed-ip ip-address=$IPVM03 -c ID -f value)
openstack floating ip create --port $PORTVM3 public

LBVIP=$(openstack loadbalancer show lb1 -c vip_address -f value)
PORTLBVIP=$(openstack port list --fixed-ip ip-address=$LBVIP -c ID -f value)
openstack floating ip create --port $PORTLBVIP public

FIP_LB=$(openstack floating ip list --fixed-ip-address $LBVIP -c 'Floating IP Address' -f value)

for i in `seq 1 100`; do curl $FIP_LB; done

No errors on that (x100) curl over the FIP_LB, getting responses from all the members.

So could you provide more info or point here any difference with this scenario ^·