{
  "id": 20031342,
  "title": "Hybrid Interconnect: Linking a Datacenter to AWS with WireGuard When Direct Connect Is Out of Budget",
  "url": "https://urgent.news/2026/11/14/hybrid-interconnect-linking-a-datacenter-to-aws-with-wireguard-when",
  "topic": "tech",
  "section": "Tech",
  "published": "2026-11-14T19:18:48.000Z",
  "source": {
    "name": "Dev.to",
    "slug": "dev-to",
    "url": "https://dev.to/florient_4262fab5463a691/hybrid-interconnect-linking-a-datacenter-to-aws-with-wireguard-when-direct-connect-is-out-of-budget-3olj"
  },
  "original_language": "en",
  "account": "Direct Connect is the preferred choice for teams requiring deterministic latency, committed bandwidth, and a contractual Service Level Agreement (SLA). However, it comes with a 3-month lead time, cross-connect fees, and port charges starting at around $220/month for a 1 Gbps hosted connection, often requiring a second port for redundancy. Many organizations need a reliable hybrid link but want it set up quickly. This article explores a production-grade alternative using two redundant WireGuard tunnels between an on-premise datacenter and an AWS Transit Gateway, with BGP via FRRouting for dynamic routing and sub-second failover. It covers sizing, MTU calculations, AWS-side setup, OpenShift cluster configurations, and how to test failover effectively.\n\nBefore building a custom solution, consider AWS Site-to-Site VPN first. It offers similar features, including BGP, at a lower cost (~$36/month) and does not have the same lead time. WireGuard interconnects are suitable when throughput per flow exceeds ~1.25 Gbps per tunnel, crypto and key control require custom management, multi-cloud symmetry is needed, or Kubernetes clusters utilize WireGuard for pod-level encryption. If none of these criteria apply, using AWS's VPN service is recommended.\n\nThe architecture involves two WireGuard appliances in AWS, each in separate Availability Zones within a dedicated Transit VPC. On-premise, there are two gateways in different racks, ideally behind different internet service providers. While four tunnels in a full mesh setup is tempting, two tunnels (connecting DC-GW-A to AWS-GW-A and DC-GW-B to AWS-GW-B) with BGP is simpler and sufficient. The critical aspect is how AWS appliances inject routes into the Transit Gateway. Plain EC2 instances cannot BGP-peer with a TGW, but Transit Gateway Connect can address this by exposing a GRE transport over an existing VPC attachment and running BGP inside it, turning two EC2 boxes into a dynamic hybrid edge.\n\nOn the on-prem side, the network ranges are 10.10.0.0/16, with internet access through the TGW. The on-prem gateways, DC-GW-A and DC-GW-B, connect to the WireGuard tunnels in AWS using UDP port 51820 via GRE and BGP. The AWS appliances, aws-gw-a and aws-gw-b, communicate with each other using GRE and BGP as well.",
  "summary": "Direct Connect is the right answer when you need deterministic latency, committed bandwidth and a contractual SLA. It is also a 3-month lead time, a cross-connect fee, a port charge starting around $220/month for a 1 Gbps hosted connection, and usually a second one for redundancy. Plenty of teams need a reliable hybrid link, not a dedicated one, and they need it next Tuesday. This article walks…",
  "key_points": [
    "Hybrid interconnect using WireGuard tunnels between on-premise datacenter and AWS Transit Gateway",
    "Two redundant WireGuard tunnels with BGP for dynamic routing and sub-second failover",
    "AWS Site-to-Site VPN recommended if throughput per flow < 1.25 Gbps per tunnel"
  ],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}