LLC Infrastructure Information

  • ETRN services are currently provided from systems in eight data centers, seven in the US and one in the UK.
  • Our primary data center is located near Kansas City, MO, US.
  • Virtually all of our data centers are served by multiple connectivity providers.
  • There is a diverse blend of providers across our data centers. This helps to insure reliable Internet connectivity and a high level of fault tolerance.
  • Most connections are via Ethernet at either 100 Mbps, 1 Gbps, 10 Gbps, or more. We closely monitor our Internet bandwidth usage. Additional bandwidth is added as needed to maintain sufficient headroom.
  • Daily off site backups are maintained for critical systems.
  • Power is protected by battery backed UPS with generator backup.
  • We negotiate strong SLAs with our providers. As a result we are able to offer strong SLAs to our customers.
  • Data center is access is limited to authorized personnel only and is protected my multiple layers of security.
Data Center Architecture Details
Routing /Firewall
Functions performed:
  1. Optimizes routing to and from remote hosts and between internal networks.
  2. Defines permitted incoming and outgoing traffic.
  3. Protects internal hosts.
  4. Manages VPN connections.
Load Balancing
Functions performed:
  1. Directs incoming traffic to the appropriate server.
  2. Isolates servers due to failure or for maintenance.

Service Layer

This is where the work of a particular service is performed. Examples include:
  • DNS Hosting Service.
  • E-Mail Archiving Service.
  • E-Mail Disaster Recovery Service.
  • E-Mail Hosting Service.
  • SPAM Filtering Service (see the diagram below).
  • Web Hosting Service.



We Answer Your Questions: FAQ

Q: What is the maximum e-mail attachment size?

A: The e-mail servers do not limit the size of individual e-mail attachments. The e-mail servers do impose a 400 MB maximum total message size limit. Individual customers can choose a smaller message size limit. We can also customize the handling of "over-sized" e-mails. Please contact us to discuss your specific needs. A couple of important facts:

1. Attachments are typically encoded in what is called Base64[1]. As a result, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original file size.

2. E-mails often contain both plain text and HTML components. This also increases the overall size of the e-mail.