Re: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-04 Thread Ken Connell
Stan...

Since we've touched on Aruba and SyslogI have a question...

We too are an Aruba shop, and do push info to a syslog server. In previous code 
2.x, as you mentioned, an authentication log would include username, mac, IP, 
and APbut since we've upgraded to 3.x, it seems the username and mac/IP 
have been separated and are no longer tied together. I do get username 
authentications, and mac/IP info, but I have no way of tying them together...

What ver code are you running and/or do you have the same issue ?



Ken Connell
Intermediate Network Engineer
Computer  Communication Services
Ryerson University
350 Victoria St
RM AB50
Toronto, Ont
M5B 2K3
416-979-5000 x6709

- Original Message -
From: Brooks, Stan [EMAIL PROTECTED]
Date: Thursday, July 3, 2008 5:39 pm
Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU


 Greg,
  
  Depending on the code version, you can set the logging levels to 
 capture user associations and authentications to a syslog server.  The 
 data logged includes the location name/group of the AP the user 
 connected to, the SSID, along with the user's MAC, IP and user ID.
  
   - Stan Brooks - CWNA/CWSP
Emory University
Network Communications Division
404.727.0226
  AIM/Y!/Twitter: WLANstan
 MSN: [EMAIL PROTECTED]
  GoogleTalk: [EMAIL PROTECTED]
  
  -Original Message-
  From: The EDUCAUSE Wireless Issues Constituent Group Listserv 
 [mailto:[EMAIL PROTECTED] On Behalf Of Scholz, Greg
  Sent: Thursday, July 03, 2008 8:55 AM
  To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
  Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks
  
  Stan,
  Can you tell me what type of location information you get and from what
  log? 802.1x/WPA-Enterprise, so we have usernames and locations in our
  logs
  
  We are trying to figure out if there is a way to determine what APs user
  are/have been on but all we have seen in the radius logs is the
  controller as the NAS.
  
  
  Thanks,
  Greg
  
  
  
  -Original Message-
  From: The EDUCAUSE Wireless Issues Constituent Group Listserv
  [mailto:[EMAIL PROTECTED] On Behalf Of Brooks, Stan
  Sent: Wednesday, July 02, 2008 6:34 PM
  To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
  Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks
  
  Mike,
  
  We, too, are an Aruba shop, and have been doing NAT on our academic and
  ResNet wireless networks for about a year now.  Two years ago, we ran
  out of IP addresses on our wireless network on Move-In Weekend and had
  to scramble to add additional subnets - a scarce commodity here at
  Emory.  To prevent that from happening last year, we implemented NAT 
 for
  our wireless clients and now have plenty of address space for our
  growing user base.
  
  We let the Aruba controllers perform the NAT function (very easy to set
  up - just a firewall rule in the user role in the Aruba config). We've
  not had any complaints from users regarding NAT issues; we were
  concerned that it might break some apps, but no problems have been
  observed or reported.  We've even got our homegrown NAC (NetReg/CAT)
  working over the wireless, too - NetReg DHCP traffic is not NAT'ed, but
  all other traffic is.  This all works great, thanks to the Aruba
  capabilities.
  
  The only issue we've had with NAT have been voiced by Philippe - DCMA
  notices are hard to isolate.  Our wired network has some protection in
  place to identify and reduce peer-to-peer traffic (Tipping Points), so
  we don't generally get a lot of notices.  User tracking and RF location
  still works well as those are functions of the radio and authentication
  subsystems.  Our academic users log on using 802.1x/WPA-Enterprise, so
  we have usernames and locations in our logs.  Connecting those usernames
  to the NAT pool IP addresses is the hard part.
  
  I'd be happy to share some basic configuration tips and tricks regarding
  NAT with you off-list, or on-list if other s are interested.
  
  BTW - We've been NAT'ing our guest access users since day one on the
  Aruba equipment.  Guests log in through the captive portal and are
  given limited access - bandwidth limited web access and VPN access back
  to their home organizations.
  
   - Stan Brooks - CWNA/CWSP
Emory University
Network Communications Division
404.727.0226
  AIM/Y!/Twitter: WLANstan
 MSN: [EMAIL PROTECTED]
  GoogleTalk: [EMAIL PROTECTED]
  
  -Original Message-
  From: The EDUCAUSE Wireless Issues Constituent Group Listserv
  [mailto:[EMAIL PROTECTED] On Behalf Of Michael Dickson
  Sent: Tuesday, July 01, 2008 9:47 AM
  To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
  Subject: [WIRELESS-LAN] NAT in large scale wireless networks
  
  Though we currently have enough available routed IP space for our
  wireless clients we are looking toward the future and wondering if
  NAT-ing the wireless network makes sense

RE: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-03 Thread Scholz, Greg
Stan,
Can you tell me what type of location information you get and from what
log? 802.1x/WPA-Enterprise, so we have usernames and locations in our
logs

We are trying to figure out if there is a way to determine what APs user
are/have been on but all we have seen in the radius logs is the
controller as the NAS.


Thanks,
Greg



-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[EMAIL PROTECTED] On Behalf Of Brooks, Stan
Sent: Wednesday, July 02, 2008 6:34 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks

Mike,

We, too, are an Aruba shop, and have been doing NAT on our academic and
ResNet wireless networks for about a year now.  Two years ago, we ran
out of IP addresses on our wireless network on Move-In Weekend and had
to scramble to add additional subnets - a scarce commodity here at
Emory.  To prevent that from happening last year, we implemented NAT for
our wireless clients and now have plenty of address space for our
growing user base.

We let the Aruba controllers perform the NAT function (very easy to set
up - just a firewall rule in the user role in the Aruba config). We've
not had any complaints from users regarding NAT issues; we were
concerned that it might break some apps, but no problems have been
observed or reported.  We've even got our homegrown NAC (NetReg/CAT)
working over the wireless, too - NetReg DHCP traffic is not NAT'ed, but
all other traffic is.  This all works great, thanks to the Aruba
capabilities.

The only issue we've had with NAT have been voiced by Philippe - DCMA
notices are hard to isolate.  Our wired network has some protection in
place to identify and reduce peer-to-peer traffic (Tipping Points), so
we don't generally get a lot of notices.  User tracking and RF location
still works well as those are functions of the radio and authentication
subsystems.  Our academic users log on using 802.1x/WPA-Enterprise, so
we have usernames and locations in our logs.  Connecting those usernames
to the NAT pool IP addresses is the hard part.

I'd be happy to share some basic configuration tips and tricks regarding
NAT with you off-list, or on-list if other s are interested.

BTW - We've been NAT'ing our guest access users since day one on the
Aruba equipment.  Guests log in through the captive portal and are
given limited access - bandwidth limited web access and VPN access back
to their home organizations.

 - Stan Brooks - CWNA/CWSP
  Emory University
  Network Communications Division
  404.727.0226
AIM/Y!/Twitter: WLANstan
   MSN: [EMAIL PROTECTED]
GoogleTalk: [EMAIL PROTECTED]

-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Dickson
Sent: Tuesday, July 01, 2008 9:47 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] NAT in large scale wireless networks

Though we currently have enough available routed IP space for our
wireless clients we are looking toward the future and wondering if
NAT-ing the wireless network makes sense.

Does anyone have any experiences, good or bad, using NAT for the
wireless client pool in a large scale environment? What features go
away (i.e. RFID or user tracking, etc.) Are there any gotchas?

We're an Aruba shop and expect about 3000+ wireless clients this
semester and have been adding more APs by the week.

Thanks,
  Mike

***
Michael Dickson Phone: 413-545-9639
Network Analyst [EMAIL PROTECTED]
University of Massachusetts
Network Systems and Services
***

**
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If you have received this message in error, please contact
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Re: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-03 Thread Cal Frye

Hector J Rios wrote:

On the topic of DMCA, RIAA, and the like, I can tell you that we use a
Juniper firewall to log all of our wireless transactions and it is
amazingly accurate. This was a must for us when we decided to move to a
private addressing scheme. The only difference is that we do PAT instead
of NAT. But in the event of a notice, we can tie a public IP address to
a private IP and a username easily, assuming we get an accurate time
stamp. With the information provided by the firewall we can tie the
public IP and time stamp to a private IP. Then, with RADIUS accounting
logs we tie the private IP to a username and MAC address. As it was
mentioned before, storage is an issue as these logs grow very quickly. 

Just curious, how far back do you keep these logs? As you say, it's a 
compromise between storage demands and utility of records.


--
Regards,
-- Cal Frye, Network Administrator, Oberlin College

   www.calfrye.com,  www.pitalabs.com


No woman can call herself free who does not own and control her body. 
-- Margaret Sanger.


**
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discussion list can be found at http://www.educause.edu/groups/.


RE: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-03 Thread Hector J Rios
Right now just 14 days of logs. 


Hector




-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[EMAIL PROTECTED] On Behalf Of Cal Frye
Sent: Thursday, July 03, 2008 10:28 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks

Hector J Rios wrote:
 On the topic of DMCA, RIAA, and the like, I can tell you that we use a
 Juniper firewall to log all of our wireless transactions and it is
 amazingly accurate. This was a must for us when we decided to move to
a
 private addressing scheme. The only difference is that we do PAT
instead
 of NAT. But in the event of a notice, we can tie a public IP address
to
 a private IP and a username easily, assuming we get an accurate time
 stamp. With the information provided by the firewall we can tie the
 public IP and time stamp to a private IP. Then, with RADIUS accounting
 logs we tie the private IP to a username and MAC address. As it was
 mentioned before, storage is an issue as these logs grow very quickly.

 
Just curious, how far back do you keep these logs? As you say, it's a 
compromise between storage demands and utility of records.

-- 
Regards,
-- Cal Frye, Network Administrator, Oberlin College

www.calfrye.com,  www.pitalabs.com


No woman can call herself free who does not own and control her body. 
-- Margaret Sanger.

**
Participation and subscription information for this EDUCAUSE Constituent
Group discussion list can be found at http://www.educause.edu/groups/.

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.


RE: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-03 Thread Brooks, Stan
Greg,

Depending on the code version, you can set the logging levels to capture user 
associations and authentications to a syslog server.  The data logged includes 
the location name/group of the AP the user connected to, the SSID, along with 
the user's MAC, IP and user ID.

 - Stan Brooks - CWNA/CWSP
  Emory University
  Network Communications Division
  404.727.0226
AIM/Y!/Twitter: WLANstan
   MSN: [EMAIL PROTECTED]
GoogleTalk: [EMAIL PROTECTED]

-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL 
PROTECTED] On Behalf Of Scholz, Greg
Sent: Thursday, July 03, 2008 8:55 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks

Stan,
Can you tell me what type of location information you get and from what
log? 802.1x/WPA-Enterprise, so we have usernames and locations in our
logs

We are trying to figure out if there is a way to determine what APs user
are/have been on but all we have seen in the radius logs is the
controller as the NAS.


Thanks,
Greg



-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[EMAIL PROTECTED] On Behalf Of Brooks, Stan
Sent: Wednesday, July 02, 2008 6:34 PM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks

Mike,

We, too, are an Aruba shop, and have been doing NAT on our academic and
ResNet wireless networks for about a year now.  Two years ago, we ran
out of IP addresses on our wireless network on Move-In Weekend and had
to scramble to add additional subnets - a scarce commodity here at
Emory.  To prevent that from happening last year, we implemented NAT for
our wireless clients and now have plenty of address space for our
growing user base.

We let the Aruba controllers perform the NAT function (very easy to set
up - just a firewall rule in the user role in the Aruba config). We've
not had any complaints from users regarding NAT issues; we were
concerned that it might break some apps, but no problems have been
observed or reported.  We've even got our homegrown NAC (NetReg/CAT)
working over the wireless, too - NetReg DHCP traffic is not NAT'ed, but
all other traffic is.  This all works great, thanks to the Aruba
capabilities.

The only issue we've had with NAT have been voiced by Philippe - DCMA
notices are hard to isolate.  Our wired network has some protection in
place to identify and reduce peer-to-peer traffic (Tipping Points), so
we don't generally get a lot of notices.  User tracking and RF location
still works well as those are functions of the radio and authentication
subsystems.  Our academic users log on using 802.1x/WPA-Enterprise, so
we have usernames and locations in our logs.  Connecting those usernames
to the NAT pool IP addresses is the hard part.

I'd be happy to share some basic configuration tips and tricks regarding
NAT with you off-list, or on-list if other s are interested.

BTW - We've been NAT'ing our guest access users since day one on the
Aruba equipment.  Guests log in through the captive portal and are
given limited access - bandwidth limited web access and VPN access back
to their home organizations.

 - Stan Brooks - CWNA/CWSP
  Emory University
  Network Communications Division
  404.727.0226
AIM/Y!/Twitter: WLANstan
   MSN: [EMAIL PROTECTED]
GoogleTalk: [EMAIL PROTECTED]

-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Dickson
Sent: Tuesday, July 01, 2008 9:47 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] NAT in large scale wireless networks

Though we currently have enough available routed IP space for our
wireless clients we are looking toward the future and wondering if
NAT-ing the wireless network makes sense.

Does anyone have any experiences, good or bad, using NAT for the
wireless client pool in a large scale environment? What features go
away (i.e. RFID or user tracking, etc.) Are there any gotchas?

We're an Aruba shop and expect about 3000+ wireless clients this
semester and have been adding more APs by the week.

Thanks,
  Mike

***
Michael Dickson Phone: 413-545-9639
Network Analyst [EMAIL PROTECTED]
University of Massachusetts
Network Systems and Services
***

**
Participation and subscription information for this EDUCAUSE Constituent
Group discussion list can be found at http://www.educause.edu/groups/.

This e-mail message (including any attachments) is for the sole use of
the intended recipient(s) and may contain confidential and privileged
information.  If the reader of this message is not the intended
recipient, you are hereby notified that any dissemination, distribution
or copying of this message

RE: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-02 Thread Brooks, Stan
Mike,

We, too, are an Aruba shop, and have been doing NAT on our academic and ResNet 
wireless networks for about a year now.  Two years ago, we ran out of IP 
addresses on our wireless network on Move-In Weekend and had to scramble to add 
additional subnets - a scarce commodity here at Emory.  To prevent that from 
happening last year, we implemented NAT for our wireless clients and now have 
plenty of address space for our growing user base.

We let the Aruba controllers perform the NAT function (very easy to set up - 
just a firewall rule in the user role in the Aruba config). We've not had any 
complaints from users regarding NAT issues; we were concerned that it might 
break some apps, but no problems have been observed or reported.  We've even 
got our homegrown NAC (NetReg/CAT) working over the wireless, too - NetReg DHCP 
traffic is not NAT'ed, but all other traffic is.  This all works great, thanks 
to the Aruba capabilities.

The only issue we've had with NAT have been voiced by Philippe - DCMA notices 
are hard to isolate.  Our wired network has some protection in place to 
identify and reduce peer-to-peer traffic (Tipping Points), so we don't 
generally get a lot of notices.  User tracking and RF location still works well 
as those are functions of the radio and authentication subsystems.  Our 
academic users log on using 802.1x/WPA-Enterprise, so we have usernames and 
locations in our logs.  Connecting those usernames to the NAT pool IP addresses 
is the hard part.

I'd be happy to share some basic configuration tips and tricks regarding NAT 
with you off-list, or on-list if other s are interested.

BTW - We've been NAT'ing our guest access users since day one on the Aruba 
equipment.  Guests log in through the captive portal and are given limited 
access - bandwidth limited web access and VPN access back to their home 
organizations.

 - Stan Brooks - CWNA/CWSP
  Emory University
  Network Communications Division
  404.727.0226
AIM/Y!/Twitter: WLANstan
   MSN: [EMAIL PROTECTED]
GoogleTalk: [EMAIL PROTECTED]

-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL 
PROTECTED] On Behalf Of Michael Dickson
Sent: Tuesday, July 01, 2008 9:47 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] NAT in large scale wireless networks

Though we currently have enough available routed IP space for our
wireless clients we are looking toward the future and wondering if
NAT-ing the wireless network makes sense.

Does anyone have any experiences, good or bad, using NAT for the
wireless client pool in a large scale environment? What features go
away (i.e. RFID or user tracking, etc.) Are there any gotchas?

We're an Aruba shop and expect about 3000+ wireless clients this
semester and have been adding more APs by the week.

Thanks,
  Mike

***
Michael Dickson Phone: 413-545-9639
Network Analyst [EMAIL PROTECTED]
University of Massachusetts
Network Systems and Services
***

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.

This e-mail message (including any attachments) is for the sole use of
the intended recipient(s) and may contain confidential and privileged
information.  If the reader of this message is not the intended
recipient, you are hereby notified that any dissemination, distribution
or copying of this message (including any attachments) is strictly
prohibited.

If you have received this message in error, please contact
the sender by reply e-mail message and destroy all copies of the
original message (including attachments).

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.


RE: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-02 Thread Hector J Rios
On the topic of DMCA, RIAA, and the like, I can tell you that we use a
Juniper firewall to log all of our wireless transactions and it is
amazingly accurate. This was a must for us when we decided to move to a
private addressing scheme. The only difference is that we do PAT instead
of NAT. But in the event of a notice, we can tie a public IP address to
a private IP and a username easily, assuming we get an accurate time
stamp. With the information provided by the firewall we can tie the
public IP and time stamp to a private IP. Then, with RADIUS accounting
logs we tie the private IP to a username and MAC address. As it was
mentioned before, storage is an issue as these logs grow very quickly. 


Hector Rios
Telecommunications Analyst, NI
Louisiana State University
Information Technology Services




-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv
[mailto:[EMAIL PROTECTED] On Behalf Of Michael Dickson
Sent: Tuesday, July 01, 2008 8:47 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: [WIRELESS-LAN] NAT in large scale wireless networks

Though we currently have enough available routed IP space for our 
wireless clients we are looking toward the future and wondering if 
NAT-ing the wireless network makes sense.

Does anyone have any experiences, good or bad, using NAT for the 
wireless client pool in a large scale environment? What features go 
away (i.e. RFID or user tracking, etc.) Are there any gotchas?

We're an Aruba shop and expect about 3000+ wireless clients this 
semester and have been adding more APs by the week.

Thanks,
  Mike

***
Michael Dickson Phone: 413-545-9639
Network Analyst [EMAIL PROTECTED]
University of Massachusetts
Network Systems and Services
***

**
Participation and subscription information for this EDUCAUSE Constituent
Group discussion list can be found at http://www.educause.edu/groups/.

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.


Re: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-01 Thread Philippe Hanset
Mike,

We have our visitor network on NAT and got an issue recently related
to RIAA (we had about 200 users on it at the time)
The request from RIAA mentioned the IP address, the Application
(GNUTELLA) with the local port  and a timestamp.

You can track the user, but it takes an accurate log!
(and it is time consuming...you might want to charge RIAA back for the
service)

Philippe
--

On Tue, 1 Jul 2008, Michael Dickson wrote:

 Though we currently have enough available routed IP space for our
 wireless clients we are looking toward the future and wondering if
 NAT-ing the wireless network makes sense.

 Does anyone have any experiences, good or bad, using NAT for the
 wireless client pool in a large scale environment? What features go
 away (i.e. RFID or user tracking, etc.) Are there any gotchas?

 We're an Aruba shop and expect about 3000+ wireless clients this
 semester and have been adding more APs by the week.

 Thanks,
   Mike

 ***
 Michael Dickson Phone: 413-545-9639
 Network Analyst [EMAIL PROTECTED]
 University of Massachusetts
 Network Systems and Services
 ***

 **
 Participation and subscription information for this EDUCAUSE Constituent 
 Group discussion list can be found at http://www.educause.edu/groups/.


**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.


Re: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-01 Thread Karl Reuss

Last academic year we ran NAT on our main wireless network.  We had
about 13,000 unique users per day and about 8,000 simultaneous
connections at peak times, roughly 95% student traffic. It worked,
but there were a couple of issues for us:

1) Picking the correct NAT box.   Catalysts 6500s do wirespeed
NAT, but they can't keep up with the number of new connections
per second.  A single ASA5550 handled the job well, now we have
a pair.

2) The NAT logs are enormous.  Finding space to keep them is
fun, going through them to find incidents is painful.


We did NAT because we added wireless to our dorms last year
and we weren't sure what the pace of our rollout would be, or how
fast the users would migrate over.  We didn't want to be shuffling
IP ranges all year.  We'll be going back to fixed IP addresses
next year for most wireless use.

-Karl Reuss
 University of Maryland, College Park




Michael Dickson wrote:
Though we currently have enough available routed IP space for our 
wireless clients we are looking toward the future and wondering if 
NAT-ing the wireless network makes sense.


Does anyone have any experiences, good or bad, using NAT for the 
wireless client pool in a large scale environment? What features go 
away (i.e. RFID or user tracking, etc.) Are there any gotchas?


We're an Aruba shop and expect about 3000+ wireless clients this 
semester and have been adding more APs by the week.


Thanks,
 Mike

***
Michael Dickson Phone: 413-545-9639
Network Analyst [EMAIL PROTECTED]
University of Massachusetts
Network Systems and Services
***

**
Participation and subscription information for this EDUCAUSE Constituent 
Group discussion list can be found at http://www.educause.edu/groups/.


**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.


RE: [WIRELESS-LAN] NAT in large scale wireless networks

2008-07-01 Thread Johnson, Neil M
What supervisor were you running in the 6500's ?

-Neil

--
Neil Johnson
Network Engineer
The University of Iowa
W: 319 384-0938
M: 319 540-2081
http://www.uiowa.edu

-Original Message-
From: The EDUCAUSE Wireless Issues Constituent Group Listserv [mailto:[EMAIL 
PROTECTED] On Behalf Of Karl Reuss
Sent: Tuesday, July 01, 2008 9:51 AM
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Subject: Re: [WIRELESS-LAN] NAT in large scale wireless networks

Last academic year we ran NAT on our main wireless network.  We had
about 13,000 unique users per day and about 8,000 simultaneous
connections at peak times, roughly 95% student traffic. It worked,
but there were a couple of issues for us:

1) Picking the correct NAT box.   Catalysts 6500s do wirespeed
NAT, but they can't keep up with the number of new connections
per second.  A single ASA5550 handled the job well, now we have
a pair.

2) The NAT logs are enormous.  Finding space to keep them is
fun, going through them to find incidents is painful.


We did NAT because we added wireless to our dorms last year
and we weren't sure what the pace of our rollout would be, or how
fast the users would migrate over.  We didn't want to be shuffling
IP ranges all year.  We'll be going back to fixed IP addresses
next year for most wireless use.

-Karl Reuss
  University of Maryland, College Park




Michael Dickson wrote:
 Though we currently have enough available routed IP space for our
 wireless clients we are looking toward the future and wondering if
 NAT-ing the wireless network makes sense.

 Does anyone have any experiences, good or bad, using NAT for the
 wireless client pool in a large scale environment? What features go
 away (i.e. RFID or user tracking, etc.) Are there any gotchas?

 We're an Aruba shop and expect about 3000+ wireless clients this
 semester and have been adding more APs by the week.

 Thanks,
  Mike

 ***
 Michael Dickson Phone: 413-545-9639
 Network Analyst [EMAIL PROTECTED]
 University of Massachusetts
 Network Systems and Services
 ***

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 Participation and subscription information for this EDUCAUSE Constituent
 Group discussion list can be found at http://www.educause.edu/groups/.

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.

**
Participation and subscription information for this EDUCAUSE Constituent Group 
discussion list can be found at http://www.educause.edu/groups/.