Abstract: Metadata indicating that a virtual traffic hub enabling connectivity between a plurality of isolated networks has been established is stored. A determination is made that a first entry of a first isolated network attached to the hub is to be represented in a second routing table of a second isolated network attached to the hub, e.g., to enable network packets originating at resources of the second isolated network to be transmitted via the hub to the first isolated network. A new entry corresponding to the first entry is included in the second routing table.

Abstract: Connectivity is enabled between a first and second isolated network using a virtual traffic hub that includes a decision master node responsible for determining a routing action for a packet received at the hub. At the hub, a determination is made that a particular domain name system (DNS) message being directed to a first resource in the first isolated network is to include an indication of a second resource in the second isolated network. The second resource is assigned a network address within a private address range of the second isolated network, which overlaps with a private address range being used in the first isolated network. The hub causes a transformed version of the network address to be included in the DNS message delivered to the first resource.

Abstract: Configuration operations to enable connectivity, using a virtual traffic hub, between a plurality of isolated networks including a first isolated network with a first private address range, are initiated. The hub includes a plurality of nodes including a decision master node responsible for determining routing actions for packets received at the hub. At the decision master node, a translation mapping is obtained for a second private address range of a second isolated network, which overlaps with the first private address range. At a particular node of the hub, using the mapping, a header of a network packet received from the second isolated network and directed to a destination outside the second isolated network is modified.