WiFi is an incredible technology that has transformed how and where people used computers, however besides advancements in speed, range and security, very little has changed how we use wireless networks. Since 2002, Microsoft Research has been exploring a fascinating idea to virtualize the WiFi adapter, turning a single piece of hardware and radio into virtually (pun) unlimited adapters. Years after the project was seemingly abandoned, it is now uncovered Virtual WiFi technology has been baked into the Windows 7 networking foundations.
In essence, how Virtual WiFi works is very similar to how virtualization works for operating systems which most people are familiar with – the transparent sharing of limited hardware resources to many operating systems. Virtual WiFi, abbreviated to VWiFi, is a software layer that abstracts the wireless LAN card hardware into multiple virtual adapters. The software handles the connections of each adapter to ensure every adapter has an opportunity to connect to their respective networks limited by time. The result is an operating system none-the-wiser and acts as if you have multiple WLAN hardware adapters working independently.
If you like to dabble in a little hardware jargon, here’s an obligatory architecture diagram which explains how Virtual WiFi works in Windows 7 in much more detail.
If you got lost somewhere between the dotted lines, read on.
You might be wondering why anyone would ever need multiple WLAN adapters on the same PC, well to be honest, you don’t need but its sometimes good to have. In any case where you’re connected to an existing wireless access point and want to connect to another network whether that be a separate access point or even set up an ad-hoc connection, Virtual WiFi will allow you to do just that. But perhaps the scenario that is more appealing is the idea of a mesh network. In a mesh network, every client becomes a repeater, growing the network organically as more clients connect. Virtual WiFi enables this, since every client can become an access point too.
Now you might be asking, “I’ve looked at every nook and cranny of Windows 7 RC, how come I haven’t seen this feature?”. Surprisingly, the feature is in Windows 7 today and has been for quite some time apparently, but hasn’t been exposed due to a lack of driver support. WLAN hardware vendors are required to recompile their drivers with a couple new additions. The good news is that Virtual WiFi functionality is going to be a requirement for WLAN drivers under the Windows 7 certification logo so expect to see it soon.
Assuming it all goes to plan, the feature will be automatically exposed.
“On Windows 7 and later, the operating system installs a virtual device if a Hosted Network capable wireless adapter is present on the machine. This virtual device normally shows up in the “Network Connections Folder” as ‘Wireless Network Connection 2’ with a Device Name of ‘Microsoft Virtual WiFi Miniport adapter’ if the computer has a single wireless network adapter. This virtual device is used exclusively for performing software access point (SoftAP) connections [...]. The lifetime of this virtual device is tied to the physical wireless adapter. If the physical wireless adapter is disabled, this virtual device will be removed as well.”
Unfortunately as it seems, the implementation of Virtual WiFi in Windows 7 is not as liberal as the research prototype. In Windows 7, you are limited to exactly one virtual adapter. However by looking at the impact of multiple virtual adapters on latency and performance from their original research report, this is probably for good reasons.
More technical information aimed at hardware vendors and developers is available at the WinHEC 2008 session, “Wireless LAN Enhancements In Windows 7″, PowerPoint downloadable here. You can also learn more about their original prototype and research paper here.
Obviously this feature isn’t as glamorous as the fancy new wallpapers or as practical as Aero Snap in Windows 7, but I think it represents one of the many silent revolutions in Windows that probably won’t be recognized and taken for granted for releases to come. I’d be interesting to see if Virtual WiFi catches on, and how new networking scenarios can be enabled by developers and hardware vendors.
36 Comments
Chris
THIS HANDS DOWN FRIGGING WICKED!!!!
Finally a MSR project comes to frutation, please say setup of this will be easily enabled and configurable and not some insane registry hack to enable it.
Long Zheng
@Chris: Yeah as I quoted in the article whenever the drivers with the new bits are available, the virtual adapter will automatically appear.
Karun AB
I might be wrong but this might just be what one of my seniors used in his final year project 2 years ago (2007-2008). He just told me that Microsoft was working on something to virtualize WiFi networks to have the ability to join multiple networks simultaneously. It sounded sweet then and looks even better now that the general public will have their hands on it
MSR ftw!
Shaun
This is great news, and I think it’s already functioning on my ageing inspiron 6400 laptop.
At least, I can connect to more than one WiFi network simultaneously, which is something I could never do in previous versions of Windows.
Or have I mis-understood terribly?
Al
” With VirtualWiFi, you can connect to a guest’s machine or play games over an ad hoc network, while surfing the web via an infrastructure network. ”
Why would you want to do that?
lexx
Aha! This is good, after waiting for several hours about your post in tweeter :p
Karun AB
@AI: Why wouldn’t you?
Ad hoc networks are totally awesome. With the ability to (virtually) connect to multiple networks, you can create mesh and relay wireless networks. Say user A is in range of an access point X but user B isn’t. But user B is in range with user A. User A could relay the connection from X to B providing B with an active connection to the network.
Also, you can play multiplayer games without need for any ethernet cables on your laptops or any other infrastructure for that matter. No need for a router or any other hardware to create a local area network
If you can have all this, why wouldn’t you want virtual WiFi?
Fred
Sounds like something one in a million people would have a use for once in his or her life. Still, who knows.
Kevin N
Interesting! Can this be used to support multiple routings? I suppose the OS can probably already do that, but I wonder if this can help… E.g. connect to access point. Over that connection, maybe via the virtual wifi, setup vpn tunnel to inside of corporate firewall (intraweb). For general internet access, use regular wifi.
anonymous
In the Windows 7 Reviewer’s Guide, it’s mentioned that a Windows 7 PC can replace a wireless access point. Now only if Windows 7 came with a Microsoft DHCP and DNS server and NAT et al. We need Server 2008 R2 for that? Also using this, would it be possible to virtualize a Wi-Fi adapter in a VM although there’s not much point to it?
someone
Best part of the Windows 7 implementation compared to the MSR project is the WPA2-PSK-AES support.
GoodThings2Life
This is perfect for system administrators like myself who frequently need to connect to a private and a public wireless connection for diagnostic work too. For example, at the hospital I work at, we have that exact setup for employees (private, secured domain access) and patients (public, internet only), and if I can connect my laptop to both (even temporarily) without suspending my domain connection to diagnose issues or reconfigure settings, all the better.
I do confess that, for security reasons, the whole ad-hoc connection idea upsets me, but I disable that by group-policy and configuration settings anyway.
Rsr
So microsoft is putting wifi into computers?
When comes build-in bluetooth to computer.. :$
bobo_minky
Now if only they would do the same thing for Ethernet connections…
JS
You know, as we prepare to move to Windows 7, and relegate Vista to the dustbin of history, you could write one of those “Windows Me deserves more respect” articles about Vista. Many people fail to realise that Windows 7 builds on the years of work (and fixing) that went into Vista and its Service Packs.
Win7 fixes many problems and adds a few new features, but Win7’s genius is not technological — it’s procedural. The new management brought a clarity and predictabity to Windows that it previously lacked (that framework allowed the team to build new technology and fix the problems with the old technology on time, and with higher performance and stability)
Vista was a far bigger technological step forward than Win7 is (and it paid for that leap forward with the stability and perf issues that plagued its launch).
A list of what Vista brought to the table might be just as interesting.
someone
JS, you can find the most comprehensive list of what Vista brought to the table here: http://en.wikipedia.org/wiki/Features_new_to_Windows_Vista and in related articles in the template.
Michal
the only thing more useful than this is allowing more than one wireless adapter to connect to more than one router at a time, effectively doubling your download rate. or connecting to one router simultaneously. now that would be cool. let’s see the local coffee place throttle my bandwidth now!!!
Leon
fyi, you can already do this on the release candidate. Under network devices, you can repeat wifi and ethernet connections to function as a repeater to a local computer, router, or if you have a secondary wifi card, you can repeat the network on there. No special cables needed, just ethernet. I’ve tested this on the linksys wrt160n router, the hp dv6885se notebook, custom computers, as well as the dell inspiron 510. Works like a dream.
eXterm
You can already do this with Ethernet connections.
Simply Add two static IPs to the interface and two gateways. I do this all the time to configure some private IP devices. If you only have to access some non routed devices you can also do Static route entries.
Now of course you can’t do two DHCP addresses on the same card if that is what you meant.
Ian Stanley
MESH WiFi
I wonder how this will taken up with corporate and government networks? Will it be another swing and a miss in their core business?
Omar Stewart
Will it be possible to throttle bandwith across virtual adaptors?
Budzer
Surprisingly, Virtual Wi-Fi is already running on my laptop. I write a blog post about it here.
http://any-tips.blogspot.com/2009/05/windows-7-are-we-ready-for-virtua l-wi.html
tony roth
I remember telling people about this at my previous site of employment (2 years ago) , they thought I was crazy. On my own I was working on a solution that could replace onstar. It involved ms’s early work on vwifi and embedded xp with a gps puck mini-itx form factor.. The issue was radio coverage or the lack of coverage. I had two ways to solve this one utilize a cell nic or vwifi. At the time ms didn’t seem to push the vwifi but somehow I knew that it would show up soon! Now the issue is that cell nic’s monthlies are dropping quite fast and I’m not sure if that will be mode that I’ll use. The only thing is most cell providers don’t let you have unlimited traffic and will block things by port/usage.. Most of the traffic I deal with is low bandwidth stuff but what if I wanted my mini-itx in my car to be able to play videos from my video server at home!
dyrtnapr
Uh Tony? You _are_ crazy.
ben
I’ve got windows 7 on my laptop and i’ve just found this. Its very easy to use, so now my sister in the room next to me who cant get good signal I can create an adhoc network and share my wlan connection with her
chris
Great article, many thinks.
DonC
To chain wireless connections, you really need two separate and simultaneous frequencies to get the full bandwidth. This typically needs two separate wifi cards. Doing it on the same frequency just brings the same problems that you get with simple network hubs: collisions. It’s OK, but the performance and TCP connection resets get worse the closer you get to the full bandwidth.
Sriram
I hope the vendors are not bothered by the bold move by Microsoft..
BTW I’ve felt that virtualization will mask certain functionalities of the hardware, and consequently the performance would be worse. We must wait and see how this promising architecture perform when the bandwidth requirement is the need of the day…
Windows 7 Tutorial
I’ve got windows 7 on my laptop and i’ve just found this. Its very easy to use, so now my sister in the room next to me who cant get good signal I can create an adhoc network and share my wlan connection with her
jeh_IT
In fact, as Windows is, one needs not to set up ad-hoc connections and infrasructure connections separately. I discovered a while ago that you can connect to another computer on your wireless network and even run programs off of it simply by putting in the computer name and accessing the shared folders. I’ve used this for printing and know that this is generally supperior to the ad-hoc because it does not have the 30 foot range limit of computer to computer as the signal is going through the router and would thus probably use the same encryption. This works even with Windows 2000 which has no native Wi-Fi and XP which only allows WEP encryption for its ad-hoc networks. (Note: Unless the host computer is Vista or later and you have password protected sharing turned off, you will always need to use account credentials recognized on the host computer.)
max99
does this integrate 3G/cellular networks as well?
Yert
Being able to do this could open up the possibility of city wide networks with slightly overlapping networks you join automatically, like on a bus that doesn’t have WiFi itself, but the city it travels in does. Of course, doing so, it would be better to be limited to two virtual adapters, and not just one. =\
Andy
W7 seems to be a bit behind the game here. The madwifi drivers for Atheros devices in Linux had this capability 2-3 years ago at least, and this capability is being migrated/has been migrated to other drivers with the move to the new(ish) mac80211 wireless stack. I think iwlwifi for Intel chipsets has had the same capability for a while too.
Harrendous
jeh_IT seems to have discovered the purpose of networking decades after everyone else!
The potential uses for this technology in mesh systems is most interesting.
Jim Howard
I wish MS had given us API programmers a better way to detect this virtual adapter than just looking for a string (”Microsoft Virtual WiFi Miniport”).
Does this string change with language?
marc
The string is the same on the German version of Win7. Just checked
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[...] to Long Zheng of istartedsomething for posting this steps. Search On Blogsdna @import [...]
Native Virtual WiFi Technology in Windows 7 Turns Your Computer to a Hot Spot | Windows 7 hacker
[...] is a software that interacts with Windows 7 native built-in Virtual WiFi technology but with a nicer user interface. Yes, it does make the work easier but frankly what it offers has [...]
As virtual WLAN Setup in Windows 7 without additional software | Technology Tips | PC will easy when you read that blog
[...] to Long Zheng of istartedsomething for posting this [...]
You Get The . Info » Latest Intel drivers add Windows 7 Virtual WiFi support – 1331th Edition
[...] If you have a reasonably new laptop with an Intel WiFi chipset then I have some good news. A set of new Intel WiFi drivers made available just a couple weeks ago, version 13.0.0.107 if you’re playing along, finally adds the necessary driver-level support for the new native Virtual WiFi technology in Windows 7. [...]