Multi-Maison or no multi home; That is the question

Hi all

This isn't technically an ESX question, but it's a question that arises for us due to how it is easy to add additional network cards (and thus the network connections) for virtual machines hosted on our ESX boxes. I'm curious to hear the views of others on the issue.

Heart - when you have a virtual machine that requires access to several VLANs, do you tend to add additional network cards to the virtual machine that connects them directly to these VLANs, or did you just a NETWORK card and route traffic for VLANs via a router/firewall?

A VirtualCenter to virtualized server is a perfect example: at the very least this needs access to your local network a LAN VLAN (for administrator access to the VC, to speak with the domain controllers), and VIRTUAL management (to talk to the ESX host) etc. As a general rule, would people connect a NETWORK adapter in the virtual VC machine to one of these two VLANs and access the other VLAN via a router/firewall, or would connect you two network adapters on the computer virtual VC, one in each of VLAN?

Curious to know how others deal with it - thank you.

See you soon,.

Matt Kilham

Hello

From a security point of view, you would add no additional network cards in different VLANS. If you do, basically ignore you the router/firewall. It of a securityrisk if the box "breaks" or routing is on accidental. I always put VMs in the VLAN they belong (DMZ, inside, OUTSIDE, regardless of SERVERS) and to determine what can the VLAN ACL and can not do to other virtual local networks and internet. Sometimes I drill smaller holes, like when an application server is outside and inside SQL. I then punch a hole from the application server for SQL server (based on IP addresses) and only opening 1433/tcp.

Of course, there are a few exceptions. One is an ISA Server. This server is using generally two or three network cards in some segments, since it IS the router/firewall. I use an ISA Server, who has earned two VLAN to its own. So my router determines what input and output (port level), ISA can do the rest (www split on headers, proxy, etc.).

Another exception, I have at home (sick I know), which is my download WHAT VM is in one VLAN different than the file server. So my VM download a big file, and then I move to the file server. My router has however limited the performance (around 5-6 MB/s), so I gave to the download area a second NETWORK adapter in the same VLAN as the server files (shame on me), now it copies +-30 MB/sec...

Visit my blog at http://erikzandboer.wordpress.com

Tags: VMware

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