Hi there, I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks -- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
I understand Ubiquity gear is very common, in use and available in Iran ... Look at their unifi product line. Faisal On Mar 31, 2012, at 5:38 AM, Shahab Vahabzadeh <sh.vahabzadeh@gmail.com> wrote:
Hi there, I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator
Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
On 3/31/2012 9:41 AM, Faisal Imtiaz wrote:
I understand Ubiquity gear is very common, in use and available in Iran ... Look at their unifi product line.
Faisal
On Mar 31, 2012, at 5:38 AM, Shahab Vahabzadeh<sh.vahabzadeh@gmail.com> wrote:
Hi there, I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator
Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
As far as I know Ubiquiti's UniFi product doesn't yet have a single SSID across multiple APs. Ruckus does have indoor and outdoor APs that when used in conjuction with their ZoneDirector product will provide a seemless SSID. I do not know if it is available in Iran though.
On Saturday, 31 March 2012, ML wrote:
On 3/31/2012 9:41 AM, Faisal Imtiaz wrote:
I understand Ubiquity gear is very common, in use and available in Iran ... Look at their unifi product line.
Faisal
On Mar 31, 2012, at 5:38 AM, Shahab Vahabzadeh<sh.vahabzadeh@gmail.com> wrote:
I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator
Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
As far as I know Ubiquiti's UniFi product doesn't yet have a single SSID across multiple APs. Ruckus does have indoor and outdoor APs that when used in conjuction with
Hi there, their ZoneDirector product will provide a seemless SSID. I do not know if it is available in Iran though.
Yes it does and can have a guest SSID as well along with hand off to a ticket server http://www.ubnt.com/unifi Check out the specs Nice and cheap compared to others on the market too -- Martin -- -- Martin Hepworth Oxford, UK
Another +1 on unifi. Very happy with price and performance. Jared Mauch On Mar 31, 2012, at 1:09 PM, Oliver Garraux <oliver@g.garraux.net> wrote:
As far as I know Ubiquiti's UniFi product doesn't yet have a single SSID across multiple APs.
Unifi does use the same SSID's across many AP's. It actually does that by default, unless you specifically disable an SSID on a particular AP.
Oliver
On 3/31/2012 1:09 PM, Oliver Garraux wrote:
As far as I know Ubiquiti's UniFi product doesn't yet have a single SSID across multiple APs. Unifi does use the same SSID's across many AP's. It actually does that by default, unless you specifically disable an SSID on a particular AP.
Oliver
Well I know UBNT is always improving their firmware so good. A year back I got the impression their software didn't support roaming and wireless clients would see multiple SSIDs with the same name instead of just one.
On Mar 31, 2012, at 3:38 AM, Shahab Vahabzadeh <sh.vahabzadeh@gmail.com> wrote:
As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name?
No, it's still infrastructure mode, not ad-hoc. Ad-hoc means "no access point". All you need to do is set the APs up to use the same SSID and authentication methods, keys, etc. It's pretty simple and can even be done with consumer gear (with less stable performance of course). If you don't put the APs all on the same layer 3 LAN (same subnet), you'll need some sort of controller-based solutions so that a user's IP address still makes sense to their computer when they move from one AP to another. If you can keep all the APs on one subnet, you won't need that. It gets a bit more complex if you are using radio to link buildings together and/or backhaul to the access point. There's plenty of good references on the internet. Note that the wireless handoffs aren't perfect on basic 802.11 gear. Your laptop might not pick the best AP if it can hear multiple APs. And you might lose a few packets when you hand-off between APs, but it's typically no big deal. Your ssh session would stay connected across those hand-offs just fine. If you plan on doing VoIP on the wireless, it gets more complex yet - you have to worry about the time it takes handoffs and that can be more complex. You have to implement WMM and DSCP. You need to worry about low-speed users (1mbps, 2mbps, etc) on the same link. It's a lot harder to build a VoIP wireless solution than a web browsing wireless solution, but still plentty possible to do without expensive equipment. In summary: you probably should find a guide on how to build wireless networks, preferably a vendor agnostic one. You will either be the hero of your organization or the enemy, depending on how well your network works.
Yes Its VoIP over wireless, mostly this university need this wireless network for their professions and students which carry their IP Phones and I care about this. Thanks On Sat, Mar 31, 2012 at 9:26 PM, Joel Maslak <jmaslak@antelope.net> wrote:
On Mar 31, 2012, at 3:38 AM, Shahab Vahabzadeh <sh.vahabzadeh@gmail.com> wrote:
As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name?
No, it's still infrastructure mode, not ad-hoc.
Ad-hoc means "no access point".
All you need to do is set the APs up to use the same SSID and authentication methods, keys, etc. It's pretty simple and can even be done with consumer gear (with less stable performance of course). If you don't put the APs all on the same layer 3 LAN (same subnet), you'll need some sort of controller-based solutions so that a user's IP address still makes sense to their computer when they move from one AP to another. If you can keep all the APs on one subnet, you won't need that.
It gets a bit more complex if you are using radio to link buildings together and/or backhaul to the access point. There's plenty of good references on the internet.
Note that the wireless handoffs aren't perfect on basic 802.11 gear. Your laptop might not pick the best AP if it can hear multiple APs. And you might lose a few packets when you hand-off between APs, but it's typically no big deal. Your ssh session would stay connected across those hand-offs just fine.
If you plan on doing VoIP on the wireless, it gets more complex yet - you have to worry about the time it takes handoffs and that can be more complex. You have to implement WMM and DSCP. You need to worry about low-speed users (1mbps, 2mbps, etc) on the same link. It's a lot harder to build a VoIP wireless solution than a web browsing wireless solution, but still plentty possible to do without expensive equipment.
In summary: you probably should find a guide on how to build wireless networks, preferably a vendor agnostic one. You will either be the hero of your organization or the enemy, depending on how well your network works.
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
Hi...How do I do it! I'm utterly amazed how many people give away free consultant work. We need to keep people working... not giving it away. Ethics... Security... etc... Does the university give away free diploma's? I don't think so. Must be another copy & paste e&^%$#?r too! Google is your friend... ;^) Cheers! Ephesians 4:32 & Cheers!!! A password is like a... toothbrush ;^) Choose a good one, change it regularly and don't share it. -----Original Message----- From: Shahab Vahabzadeh [mailto:sh.vahabzadeh@gmail.com] Sent: Saturday, March 31, 2012 2:39 AM To: nanog@nanog.org Subject: Outdoor Wireless Access Point Hi there, I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks -- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
On Sat, 31 Mar 2012 15:48:37 -0700, Network IP Dog said:
I'm utterly amazed how many people give away free consultant work.
A lot of us are quite busy with $DAYJOB and not in a position to take on a consulting engagement - and there's no good micropayment infrastructure to deal with 20-minute consulting gigs anyway. So we give away 5 minute chunks of our time for the benefit of the networking community. It's a large chunk of what makes 'best common practices' evolve. (Hint - that consultant you hired? How much of *their* knowledge did they aquire from other people's free advice?) And those of us who *do* go looking for consulting gigs often need to market ourselves as somebody clued. You read NANOG for a while, you get a good idea of who is clued and who isn't. And thus you decide who gets the gig.
Google is your friend... ;^)
On 01/04/12 09:49, Valdis.Kletnieks@vt.edu wrote:
On Sat, 31 Mar 2012 15:48:37 -0700, Network IP Dog said:
I'm utterly amazed how many people give away free consultant work.
A lot of us are quite busy with $DAYJOB and not in a position to take on a consulting engagement - and there's no good micropayment infrastructure to deal with 20-minute consulting gigs anyway. So we give away 5 minute chunks of our time for the benefit of the networking community. It's a large chunk of what makes 'best common practices' evolve. (Hint - that consultant you hired? How much of *their* knowledge did they aquire from other people's free advice?)
Also if it's something that makes you go "huh, good question" the time spent to research it can often pay off later (several times now I've spent hours thinking over a list question, and had something similar asked of me in my day job only a few days or weeks later).
Hi Valdis, Thanks for your time and your answer, Of course I know how to search in google or internet. But the problem is as you told to have a good network and launch the best solution. And not do wrong things once more. Thanks On Sun, Apr 1, 2012 at 4:19 AM, <Valdis.Kletnieks@vt.edu> wrote:
On Sat, 31 Mar 2012 15:48:37 -0700, Network IP Dog said:
I'm utterly amazed how many people give away free consultant work.
A lot of us are quite busy with $DAYJOB and not in a position to take on a consulting engagement - and there's no good micropayment infrastructure to deal with 20-minute consulting gigs anyway. So we give away 5 minute chunks of our time for the benefit of the networking community. It's a large chunk of what makes 'best common practices' evolve. (Hint - that consultant you hired? How much of *their* knowledge did they aquire from other people's free advice?)
And those of us who *do* go looking for consulting gigs often need to market ourselves as somebody clued. You read NANOG for a while, you get a good idea of who is clued and who isn't. And thus you decide who gets the gig.
Google is your friend... ;^)
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
On Sun, 01 Apr 2012 11:28:34 +0430, Shahab Vahabzadeh said:
Thanks for your time and your answer, Of course I know how to search in google or internet. But the problem is as you told to have a good network and launch the best solution.
Unfortunately, I can't make any real recommendation for your net - although we have some 1300 access points scattered across 100 buildings (a combination of Cisco and Aruba gear) with a peak of 10,700 or so simultaneous users, we have not ireally addressed the issue of outdoor wireless. For much of campus, it's not a big problem, as buildings are packed fairly close together, and many of the good benches, trees, retaining walls, and other places to sit are close enough to a building that signal leakage from inside allows users to connect anyhow. But there's a 22 acre field (about twice the size of the garden you are trying to support) in the middle of campus... literally in the middle, as in "the campus is built around that field". ;)
If you use unifi there is an outdoor version. You can mount it outside a building or on a pole. Jared Mauch On Apr 1, 2012, at 3:58 AM, Valdis.Kletnieks@vt.edu wrote:
But there's a 22 acre field (about twice the size of the garden you are trying to support) in the middle of campus... literally in the middle, as in "the campus is built around that field". ;)
On Sun, Apr 01, 2012 at 03:58:31AM -0400, Valdis.Kletnieks@vt.edu wrote:
But there's a 22 acre field (about twice the size of the garden you are trying to support) in the middle of campus... literally in the middle, as in "the campus is built around that field". ;)
(No doubt Valdis knows this, but..) It is kind of funny to realtime-translate this from Latin to English where applicable, and get "But there's a 22 acre field in the middle of the field" and "the field is built around that field" ;-) ++; -- /Måns, blaming his Latin class.
Dear IP Dog, Thanks for your time too, but I think you are so free and you are only showing off yourself busy ;) Because your answer reflect that to us, Here is a mailing list and open community ;) So if you do not have a good answer for question please go away ;) Thanks On Sun, Apr 1, 2012 at 3:18 AM, Network IP Dog <network.ipdog@gmail.com>wrote:
Hi...How do I do it!
I'm utterly amazed how many people give away free consultant work.
We need to keep people working... not giving it away.
Ethics... Security... etc...
Does the university give away free diploma's? I don't think so.
Must be another copy & paste e&^%$#?r too!
Google is your friend... ;^)
Cheers!
Ephesians 4:32 & Cheers!!!
A password is like a... toothbrush ;^) Choose a good one, change it regularly and don't share it.
-----Original Message----- From: Shahab Vahabzadeh [mailto:sh.vahabzadeh@gmail.com] Sent: Saturday, March 31, 2012 2:39 AM To: nanog@nanog.org Subject: Outdoor Wireless Access Point
Hi there, I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator
Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
On 31 Mar 2012, at 23:51, "Network IP Dog" <network.ipdog@gmail.com<mailto:network.ipdog@gmail.com>> wrote: Hi...How do I do it! I'm utterly amazed how many people give away free consultant work. We need to keep people working... not giving it away. Ethics... Security... etc... Does the university give away free diploma's? I don't think so. Must be another copy & paste e&^%$#?r too! Google is your friend... ;^) Cheers! Ephesians 4:32 & Cheers!!! For I was hungry and you gave me nothing to eat, I was thirsty and you gave me nothing to drink, 43 I was a stranger and you did not invite me in, I needed clothes and you did not clothe me, I was sick and in prison and you did not look after me.’ 44 I needed some help building a wireless network and you wanted consultancy fees. I think the day we stop helping each other on this list and start demanding consultancy fees will be the day the Internet really did die.. So whilst nobody would document an end to end design for nothing, I think the odd snipped of good advice should always be free. Of course, y'all should google it first because how else are they going to send you relevant advertisements! -- Leigh ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________
I won't touch why we share info, others have already beat that horse dead, but I will say that This list is fairly hostile to people wanting to use them as 'free consultants'. Just look back through the archives for people that post with a message similar to: 'I want to start an isp can someone give me a step by step guide'. They aren't usually received nearly as well as someone who asks 'does anyone have any solutions to this specific problem I'm facing?' On Mar 31, 2012 3:49 PM, "Network IP Dog" <network.ipdog@gmail.com> wrote:
Hi...How do I do it!
I'm utterly amazed how many people give away free consultant work.
We need to keep people working... not giving it away.
Ethics... Security... etc...
Does the university give away free diploma's? I don't think so.
Must be another copy & paste e&^%$#?r too!
Google is your friend... ;^)
Cheers!
Ephesians 4:32 & Cheers!!!
A password is like a... toothbrush ;^) Choose a good one, change it regularly and don't share it.
-----Original Message----- From: Shahab Vahabzadeh [mailto:sh.vahabzadeh@gmail.com] Sent: Saturday, March 31, 2012 2:39 AM To: nanog@nanog.org Subject: Outdoor Wireless Access Point
Hi there, I asked for a wireless solution for a university, in which they want indoor wireless solution for more than 5 building (at least two floor) and outdoor wireless solution for near 160m*280m garden. As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name? I do not know if I could ask question clearly or not, suppose we have 4 radio but only one SSID is broadcasting and when you are near the radio is near to you you will get service from that one, as this solution must be implement for indoor ones too. And if there is any good company which can both indoor and outdoor solution and they have shipping to Iran too or reseller in Iran please give me the url. Thanks
-- Regards, Shahab Vahabzadeh, Network Engineer and System Administrator
Cell Phone: +1 (415) 871 0742 PGP Key Fingerprint = 8E34 B335 D702 0CA7 5A81 C2EE 76A2 46C2 5367 BF90
Shahab Vahabzadeh wrote:
As I look for maps we need at least 3 or 4 outdoor radio, I think in these networks the best solution is to have only one SSID in whole network to give mobility for the network, is this called ad-hoc? or it has an other name?
It is usually called nomad, because it is not really mobility. With 802.11, you can connect to an AP and, if the AP fails, you may be connected to another AP, but the transition takes considerable amount of time not tolerable for voice communication, which is why it is not called mobility. If you want mobility, have different SSIDs for APs in the same frequency band (or, let terminals have multiple sets of radio interfaces) and let terminals connect to multiple APs simultaneously. Then, run mobile IP to *RAPIDLY* control the primary AP depending on signal quality of beacons from APs. Though you only have to modify software on terminals, AFAIK, there is no such commercial products.
And if there is any good company which can both indoor and outdoor solution
With your environment, you only need indoor equipments with external antennas located outdoors. Masataka Ohta
On Apr 1, 2012, at 3:44 PM, Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp> wrote:
With 802.11, you can connect to an AP and, if the AP fails, you may be connected to another AP, but the transition takes considerable amount of time not tolerable for voice communication, which is why it is not called mobility.
True under basic 802.11, at least with WPA2 + EAP, for some clients. Not all clients wait until they lose connectivity to start looking for another AP - it depends on how the client was built. However, even without needing to lose connectivity to learn what other APs are nearby, there still is a substantial associatiation delay with EAP. That's why 802.11r + 802.11k exist. I'm sure the big name vendors support this and also support their proprietary alternatives that may or may not be better.
If you want mobility, have different SSIDs for APs in the same frequency band (or, let terminals have multiple sets of radio interfaces) and let terminals connect to multiple APs simultaneously.
That's one way of doing it, provided you have a way to manage all the end devices when you add new APs. It has the disadvantage of not being a COTS solution AFAIK. Another way to do it is Meru's "one frequency, one MAC" approach. As for locating other access points, even without 802.11k, most solutions I have seen go into power save mode for long enough to do a quick scan every once in a while, taking into account the size of the phone's jitter buffer. That causes the AP to hold packets until the scan finishes. So one channel is not required for fast roaming. I've seen solutions cope without 802.11r + 802.11k by using a WEP-only SSID on each AP (typically the same SSID for all APs) and throwing that into a VOIP-only VLAN. But with smartphones capable of running VoIP clients, I'd be less inclined to do it that way even if I thought WEP was secure-enough for voice calls. The other solution that I've seen some things support is to use WDS on the VoIP device. I'm also not a fan of that personally, but others may be. WDS would require one frequency throughout the network however.
Though you only have to modify software on terminals, AFAIK, there is no such commercial products.
There are plenty of commercial products that support VoIP handoff without issues. Some are proprietary, some are open standards. Many support multi-channel networks. It starts to get expensive to do this though, as most (all?) of the cheap vendors don't do what is required on the AP side. That said, I'd love to hear I'm wrong on this - I'm looking for new APs for home. So, if I was buying an enterprise 802.11 solution and needed to support seamless VoIP roaming, I'd look at either a one-vendor solution (I'm sure Cisco phones + Cisco APs + Cisco Controller + Cisco PBX would do this just fine, for instance; you can substitute a few other big vendors for Cisco, no doubt, although not likely cheap ones; you'll be spending 10x or more per AP in many cases than if you could have used the cheap ones) or someone that complies with 802.11r + 802.11k (both for handses and APs). Obviously your network better support DSCP and/or VLAN priority marking and WMM as well. Supporting VoIP handoff is much more complex (and, at least from what I've seen, expensive) than supporting web browsing handoff. It's also what seperates different pricing tiers of wireless equipment.
Joel Maslak wrote:
With 802.11, you can connect to an AP and, if the AP fails, you may be connected to another AP, but the transition takes considerable amount of time not tolerable for voice communication, which is why it is not called mobility.
True under basic 802.11, at least with WPA2 + EAP, for some clients. Not all clients wait until they lose connectivity to start looking for another AP - it depends on how the client was built.
The problem of looking for another APs is that, to scan existence of other APs with reasonable reliability, clients must listen to other channels for considerable amount of time (three times maximum beacon interval, maybe), during which the clients can't receive packets from the current APs. That's why most, if not all, clients search new APs only after they loss connection with the current APs.
However, even without needing to lose connectivity to learn what other APs are nearby, there still is a substantial associatiation delay with EAP.
That's not a problem, in this case, when all the servers will be located in a university campus.
That's why 802.11r + 802.11k exist.
I'm afraid it is a L2 implementation of broken idea of PANA.
If you want mobility, have different SSIDs for APs in the same frequency band (or, let terminals have multiple sets of radio interfaces) and let terminals connect to multiple APs simultaneously.
That's one way of doing it, provided you have a way to manage all the end devices when you add new APs. It has the disadvantage of not being a COTS solution AFAIK.
It is because the currently recognized commercial demand is to have smooth migration between 2/3G and WLAN, for which two RFs one for 2/3G and another for WLAN is enough.
Another way to do it is Meru's "one frequency, one MAC" approach.
"one frequency, one MAC"? I think it does not eliminate overhead of channel scanning, or, does it?
As for locating other access points, even without 802.11k, most solutions I have seen go into power save mode for long enough to do a quick scan every once in a while, taking into account the size of the phone's jitter buffer. That causes the AP to hold packets until the scan finishes. So one channel is not required for fast roaming.
Then, very short beacon intervals must be assumed.
But with smartphones capable of running VoIP clients, I'd be less inclined to do it that way even if I thought WEP was secure-enough for voice calls.
Smart phones makes the situation worse. With applications with high speed communication, 50ms loss of communication can be significant. At 12Mbps, twenty 1500B packets are lost in 50ms.
Supporting VoIP handoff is much more complex (and, at least from what I've seen, expensive) than supporting web browsing handoff.
Both of them are difficult in their own way that the complete solution (within WLAN SS, between 2/3G and WLAN, between WLAN of different service providers etc.) can be found only at L3 layer, IMHO. Masataka Ohta
participants (14)
-
Faisal Imtiaz -
Jacob Broussard -
Jared Mauch -
Joel Maslak -
Julien Goodwin -
Leigh Porter -
Martin Hepworth -
Masataka Ohta -
ML -
Måns Nilsson -
Network IP Dog -
Oliver Garraux -
Shahab Vahabzadeh -
Valdis.Kletnieks＠vt.edu