TCP checks from the Montreal node attempt a three-way handshake to the specified host and port from AS16276 (OVH SAS). OVH is a large hosting provider and its IP ranges are well-known globally. Most application firewalls and security groups have no specific rules against OVH Montreal source IPs, making TCP checks from this node a reliable test of whether a port is genuinely open and the path is intact. Typical use cases include verifying web ports (80, 443), mail ports (25, 587, 993), and database or custom application ports.

Montreal's proximity to New York — roughly 15 ms — means TCP connection times to US East Coast targets will be close to the theoretical minimum based on that RTT. A TCP handshake to a server in New York should complete in 30–35 ms from Montreal (two round trips at minimum for a full handshake). If you are seeing TCP connection times significantly above that, the cause is server-side — backlog queue, slow SYN processing, or asymmetric routing on the return path.

For testing mail server reachability from Canada, the OVH Montreal network has clean SMTP egress paths. Port 25 is not blocked outbound from OVH hosting ranges, unlike many residential or cloud providers. A TCP check to port 25 from this node confirms whether your mail server accepts connections from a Canadian hosting IP — relevant for diagnosing mail delivery problems specifically for mail originating from Canadian hosting environments.

Canada's internet infrastructure is divided along geographic lines. Toronto is the financial and commercial hub, home to TorIX — the country's largest internet exchange by both membership count and peak traffic. Montreal serves as the eastern gateway, with strong connectivity to the US Northeast and transatlantic routes via New York. Vancouver anchors the west coast with direct paths to the US Pacific Northwest and, through undersea cables, to Asia-Pacific. Our probe node sits in Montreal on AS16276 (OVH SAS), hosted in OVH's own datacenter — Montreal is the North American operations base for OVH, one of the world's largest hosting and cloud providers.

OVH (AS16276) is a significant network in its own right. It operates a large global backbone with its own fiber infrastructure and peering agreements at major IXPs including MBIX Montreal, TorIX Toronto, and multiple European exchanges. Traffic from the OVH Montreal node tends to route efficiently toward both US East Coast and European destinations, reflecting OVH's dual transatlantic and North American footprint. The AS16276 prefix space is well-known to major GeoIP databases as a hosting network headquartered in France but with a major Canadian presence.

Reference RTTs from the Montreal node: Montreal to New York is approximately 15 ms over well-peered paths, Montreal to Toronto around 17 ms, Montreal to Boston 10–12 ms, and Montreal to London approximately 85 ms. These figures are consistent with OVH's direct peering at DE-CIX Frankfurt and LINX London, which avoids unnecessary transit hops for transatlantic traffic. Montreal to Los Angeles runs roughly 70–75 ms via central US backbones.

Canada's domestic backbone connects the major cities via long-haul fibre operated by Bell Canada (AS577), Telus (AS852), Rogers (AS812), and Shaw (AS6327). These carriers maintain east-west capacity across thousands of kilometres of geography. Cross-country latency from Montreal to Vancouver is typically 65–75 ms. At the IX level, TorIX in Toronto anchors the national peering ecosystem — most Canadian ISPs maintain a TorIX port even if they also peer regionally at MBIX or VANIX. Equinix Toronto provides carrier-neutral colocation adjacent to the TorIX fabric.

Testing from the Montreal node covers a specific slice of Canadian network conditions: an OVH-hosted server in eastern Canada with strong US Northeast and European connectivity. For services targeting Canadian audiences broadly, the Montreal node is most representative of Quebec and Atlantic Canada users, and of Canadian traffic that routes through US East Coast hubs. Services specifically targeting Ontario or western Canada would benefit from nodes in Toronto or Vancouver for a fuller picture, but Montreal provides a solid baseline for Canada-wide reachability tests.