KVM Guest Unable to reach Gateway Through Bridge Vlan Tag

Hi Everyone,

I'm facing an issue that KVM guest unable to ping gateway with topology below :

------------------------------------------------
|   Router ---->  KVM host ----- >KVM guest  |
-------------------------------------------------

with configured networking :

• Router has configured non-tagged VLAN and Vlan57 on eth1 interface.

  1. Non tagged VLAN with IP : 192.168.56.101/24
  2. Tagged VLAN ID 57 with IP : 192.168.57.101/24

• KVM host has configured :

  1. enp0s3 --> main ethernet interface
  2. br0 ---> bridge with slave enp0s3 with IP : 192.168.56.201/24
  3. br0.57 --> vlan interface for vlan ID 57 through br0 (enp0s3).
  4. virbr57 --> bridge with slave br0.57 vlan and vnet(x) of KVM guests with IP : 192.168.57.201/24

• KVM guest has configured :

  1. Network configuration : Bridged to virbr57 (KVM host)
  2. enp0s3 --> 192.168.57.202/24 (normal configuration)

Conditions :
- KVM host can reach to the Router interfaces.
- KVM guest unable to reach the Router interfaces.
- KVM guest can reach KVM host IP and other KVM guest ON same IP segment
- I have enabled 802.1Q module AND IP forwarder on sysctl.conf.

What the problem and what the configuration has missed?
Thank you.

Regards,