Transit Gateway attachmet

Question

Hello,

Is there a way to filter direct connect and VPN traffic with AWS firewall without using transit gateway?

Thanks

Answer

For the North-South inspection TGW is mandatory, see below section from this [blog](https://aws.amazon.com/blogs/networking-and-content-delivery/deployment-models-for-aws-network-firewall/)

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**North-South: Centralized on-premises egress & ingress via Transit Gateway and Transit VIF/Direct Connect gateway/AWS Site-to-Site VPN**

Let’s expand the previous model and add inspection for North-South traffic between AWS VPC and on-premises via AWS Transit Gateway. AWS Transit Gateway can connect to your on-premises via AWS Direct Connect or via AWS Site-to-Site VPN.

**A key requirement** for this model is to connect AWS Direct Connect using Transit VIF to AWS Transit Gateway. In case of VPN to on-premises, AWS Site-to-Site VPN can also be used and **must** be established to AWS Transit Gateway as per Figure 9.

![Enter image description here](/media/postImages/original/IM1PEzUQ8zS86IQu6bWRgSiw)

Transit Gateway attachmet

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