We will be doing some maintenance on our core network in Interxion. We have to move some connections in order to facilitate the introduction of extra firewalls at a future date.
As all the connections are redundant, there should no interruption to the network, however there could be two slight blips are the network figures out the new paths.
Update 26/09/09 07:05: This work has been completed with no interruption to the network.
When: Wednesday February 11th at 23:00 hours until 2am
What: Starting at approx 23:00 hours we'll be installing new ASA software versions on the two HA pairs in DEG and InterXion. We'll do DEG first which affect anyone in the following IP ranges:
81.17.244.0/22
81.17.248.0/23 (Windows Hosting, Helm)
81.17.252.0/23 (Linux Hosting, Directadmin)
78.153.222.128/27
81.17.242.104/29 (Blacknight Website Infrastructure)
InterXion will follow and the following ranges there will be affected:
78.153.212.0/24 PEM CP/Backend infrastructure (cp.blacknight.com
81.17.254.0/23 New shared linux hosting services, mysql servers, web servers, mail servers
81.17.250.0/23 New shared windows hosting servers, SQL servers etc
78.153.200.0/23
78.153.208.0/22 VPS public network block
Outage possibilities:
While outage possibilities are slim, there could be upto 5 second hits as the ASA's failover during the upgrade. Each HA pair is completely resilient in design and normally updates are hitless, but we're learned from experience that this isn't always the case.
We're classifying this notification as none service affecting and for information purposes only but we would say that services to the above network ranges are at risk during this window.
If you have any questions please contact us ASAP.
Update: 22:00 Wednesday 11th
This is just to notify people that we'll be starting this maintenance window in approx 1 hour from now.
Update: 23:10 Wednesday 11th
This maintenance window is complete. We reloaded the standby firewalls between 22:30 and 23:00 so the reload of the live firewalls lasted around 15 seconds each. We recorded approx 19 packets to drop during each reload. However all TCP sessions stayed up and also all web requests were queued for several seconds during the reload. So all in all a hitless maintenance window as we predicted.