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From a pure routing perspective. Another possible option is to use TransitGateway and EgressVPC attached with the Transit Gateway. Advertise prefix 0.0.0.0/0 from TGW side to on-premises. The on-premises router then sends default traffic to TGW. TGW then sends this traffic out to the Internet via Egress VPC. This can be done by adding a static route 0.0.0.0/0 with a target to EgressVPC attachment. Egress VPC can have a NAT Gateway or other third party filtering device to NAT outgoing traffic.
answered 5 years ago
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