DFW and Tables of Tracker connections

If all goes well, an interesting question for you everything about page 22 and 23 in the NSX (https://www.vmware.com/files/pdf/products/nsx/vmw-nsx-network-virtualization-design-guide.pdf) design guide

Thus, when a virtual machine communicates to VM - B, it checks the Table of connection (CTT) Tracker to see if it is allowed. If he had never communicated to others this (b) VM and there is a DFW rule allowing this, a new line is registered in CTT - i.e. If she need to communicate again in the future, it will not need to check all the rules in the DFW, it will simply check the TTC and see that there is a line saying that he can move forward.

That makes little sense, and I love the sound, but what if I change the firewall rule to BLOCK?

Not the TTC can be dynamically updated or are there set intervals where it checks the DFW for changes? I don't see this side of it is mentioned in the description.

I'm interpreting, or just being stupid?

Hello

I just tried in the laboratory.

I created a rule that allows specific vm traffic, publish the changes to dfw.

Modified the rule to block, published the change and have lost almost instant ping.

Changed again, to publish the changes and starts almost instantly ping again.

So yes, it's an instant update (pushed by nsx) Manager to the esxi host

When do a test with the download of a file and changing to allow to block and to publish it, it stops instantly download.

Here is some info deep dive:

http://www.routetocloud.com/2015/04/NSX-distributed-firewall-deep-dive/

Tags: VMware

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