Hi All, I have installed openstack-mitaka release on CentO7.2 system.I have disabled the security-groups and port security for all the neutron ports/all VMs using below stated. ML2 port security is enabled in /etc/neutron/plugins/ml2/ml2_conf.ini: extension_drivers = port_security #!/bin/bash for port in $(neutron port-list -c id -c port_security_enabled -c fixed_ips | grep True | cut -d '|' -f2); do echo "Removing security-groups and port_security for port: $port" neutron port-update --no-security-groups --port_security_enabled=False $port done echo "Completed" Thereafter when I send IPsec ESP traffic from One VM1 to another VM2, it is being received and captured (by tcpdump) by the corresponding tap device but the same is not being received on Linux bridge (qbrxxx) and qvbxxx (of VM1). Note that, if I send UDP traffic then I do not find any issue. It is being carried forwarded to VM2. The VM1's eth0 interface is connected to a Linux tap device tap2caa3b0e-e3 which is plugged into a Linux bridge, qbr2caa3b0e-e3. There are no iptables filtering applied when packets passing into or out of the Linux bridge. Can anyone please suggest what might the issue and its solution? Thank you in advance for your time and support. Here goes the configurations. Please feel free to let me know if you need any additional information. [root@stag48 ~(keystone_admin)]# brctl show bridge name bridge id STP enabled interfaces qbr2caa3b0e-e3 8000.1ec72d90a310 no qvb2caa3b0e-e3 tap2caa3b0e-e3 qbr408fa3a3-b4 8000.e6f0e680f28f no qvb408fa3a3-b4 tap408fa3a3-b4 qbr5fa991b5-de 8000.02c32f416df0 no qvb5fa991b5-de tap5fa991b5-de qbraf134785-23 8000.46e43737b69f no qvbaf134785-23 tapaf134785-23 qbre698fa07-9c 8000.5ea17f458f55 no qvbe698fa07-9c tape698fa07-9c qbrf6756f4d-08 8000.b2f79fe90f20 no qvbf6756f4d-08 tapf6756f4d-08 [root@stag48 ~(keystone_admin)]# iptables -S | grep tap2caa3b0e-e3 [root@stag48 ~(keystone_admin)]# [root@stag48 ~(keystone_admin)]# neutron security-group-rule-list +--------------------------------------+----------------+-----------+-----------+---------------+------------------+ | id | security_group | direction | ethertype | port/protocol | remote | +--------------------------------------+----------------+-----------+-----------+---------------+------------------+ | 16c2d8c8-a286-4b71-8045-94cd303b5c02 | default | ingress | IPv4 | 22/tcp | 0.0.0.0/0 (CIDR) | | 2332057f-8c66-4aa6-8700-561b26a5b906 | default | ingress | IPv4 | any | default (group) | | 4798772b-561f-4960-85b2-2453613d527e | default | ingress | IPv6 | any | default (group) | | 5142e3b2-d2ff-40c5-87eb-5d646852f2d4 | default | ingress | IPv4 | icmp | 0.0.0.0/0 (CIDR) | | 7179fc0a-5533-433a-8cc9-3099eeff5a4b | default | egress | IPv4 | any | any | | 7cb2f140-6c97-499a-b5f7-6bcc16f6c9a3 | default | ingress | IPv6 | any | default (group) | | 829e7607-463a-4c7a-b162-8357f47924d1 | default | ingress | IPv4 | 1-65535/udp | 0.0.0.0/0 (CIDR) | | 9f1b8571-3c46-4f53-ac80-835d2186a3c0 | default | egress | IPv6 | any | any | | bd46535b-6311-46f6-9b5c-cda78194ac01 | default | egress | IPv4 | any | any | | e1b7ab35-8426-4c07-b5bc-d5760b291520 | default | ingress | IPv4 | any | default (group) | | e82da2bf-f2e1-4d33-916b-ecb90b5db857 | default | egress | IPv6 | any | any | +--------------------------------------+----------------+-----------+-----------+---------------+------------------+ [root@stag48 ~(keystone_admin)]# nova secgroup-list-rules default +-------------+-----------+---------+-----------+--------------+ | IP Protocol | From Port | To Port | IP Range | Source Group | +-------------+-----------+---------+-----------+--------------+ | | | | | default | | icmp | -1 | -1 | 0.0.0.0/0 | | | udp | 1 | 65535 | 0.0.0.0/0 | | | tcp | 22 | 22 | 0.0.0.0/0 | | | | | | | default | +-------------+-----------+---------+-----------+--------------+ [root@stag48 ~(keystone_admin)]# [root@stag48 ~(keystone_admin)]# nova list +--------------------------------------+-------------+--------+------------+-------------+-------------------------------------------------------------------------+ | ID | Name | Status | Task State | Power State | Networks | +--------------------------------------+-------------+--------+------------+-------------+-------------------------------------------------------------------------+ | 38207997-25af-4113-bc40-109b2745412c | VM2 | ACTIVE | - | Running | private1=11.0.151.13, 172.19.208.25; private=10.0.151.50, 172.19.208.15 | | 302f90eb-2d0a-4a74-8e95-92ac8c7e2b71 | VM1 | ACTIVE | - | Running | private1=11.0.151.14, 172.19.208.26; private=10.0.151.51, 172.19.208.16 | +--------------------------------------+-------------+--------+------------+-------------+-------------------------------------------------------------------------+ [root@stag48 ~(keystone_admin)]# Regards, Chinmaya