Every time I talk about small (per-application) virtual appliances , someone inevitably cries “ And who will manage thousands of appliances...
Showing posts with label load balancing. Show all posts
Showing posts with label load balancing. Show all posts
Are Your Applications Cloud-Friendly?
A while ago I had a discussion with someone who wanted to be able to move whole application stacks between different private cloud solutions...
Estimating the Number of TCP Sessions per Host
Another day, another stateful debate, this time centered on the number of flows per hypervisor. Previously I guestimated 2.500 connections-p...
OpenFlow and Fermi Estimates
Fast advances in networking technologies (and the pixie dust sprinkled on them) blinded us – we lost our gut feeling and rule-of-thumb . Gu...
Test virtual appliance throughput with Spirent Avalanche NEXT
During the Networking Tech Field Day 6 Spirent showed us Avalanche NEXT – another great testing tool that generates up to 10Gbps of perfect...
Virtual Appliance Routing – Network Engineer’s Survival Guide
Routing protocols running on virtual appliances significantly increase the flexibility of virtual-to-physical network integration – you can...
Dirty Details of Inter-DC VM- and IP Address Mobility
The upcoming Data Center Interconnect webinar ( register ) is sponsored by Enterasys Networks , so it’s obvious that I’ll also mention how ...
What is Network Virtualization
Brad Hedlund wrote another great article, this one explaining the fundamentals of network virtualization . As you'll see, VMware (and ev...
Load Balancing Across Multiple MPLS/VPN Providers
Arnold sent me an interesting challenge: he’s using two MPLS/VPN providers, with most sites being connected to both providers. He’d like to ...
Load Balancing Webinar
My newest webinar ( scheduled for end of April ) focuses on scale-out application architectures and load balancing in data centers . We’ll s...
Stackable Data Center Switches? Do the Math!
Imagine you have a typical 2-tier data center network (because 3-tier is so last millennium): layer-2 top-of-rack switches redundantly conne...
Why is OpenFlow focused on L2-4?
Another great question I got from David Le Goff: So far, SDN is relying or stressing mainly the L2-L3 network programmability (switches and ...
BGP route replication in MPLS/VPN PE-routers
Whenever I’m explaining MPLS/VPN technology, I recommend using the same route targets (RT) and route distinguishers (RD) in all VRFs belongi...
Equal-Cost Multipath in Brocade’s VCS Fabric
Understanding equal-cost multipathing in Brocade’s VCS Fabric is a bit tricky, not because it would be a complex topic, but because it’s a ...
ARP reply with multicast sender MAC address is indeed illegal
A while ago I was writing about the behavior of Microsoft’s Network Load Balancing , the problems it’s causing and how Microsoft tried to ha...
LineRate Proxy: Software L4-7 Appliance With a Twist
Buying a new networking appliance (be it VPN concentrator, firewall or load balancer … aka Application Delivery Controller ) is a royal pain...
vCider: A Hammer Looking For a Nail?
Last week Juergen Brendel published an interesting blog post describing how you can use vCider to implement high-availability clusters with...
Beware of fabric-wide Link Aggregation Groups
Fernando made a very valid comment to my Monkey Design Still Doesn’t Work Well post: if we would add a few more links between edge and core...
Microsoft Network Load Balancing Behind the Scenes
I figured out I wrote a lot about Microsoft Network Load Balancing (NLB) without ever explaining how that marvel of engineering works. To f...
IP renumbering in disaster avoidance Data Center designs
It’s hard for me to admit, but there just might be a corner use case for split subnets and inter-DC bridging : even if you move a cold VM be...