James, if you using cisco wlc, the default behaviour is to block broadcast and
multicast traffic from being sent out the WLAN to other wireless client
devices. We are using multiple /21 private IPs with NAT.
David Wang
Networking and Security Services, CCS
University of Guelph 519-824-4120 ext 52046
On 2009-12-16, at 10:04 AM, Jamie Savage wrote:
Ken,
/20 subnets?.............I've always been concerned about such a large
broadcast domain.....ie....we've not gone larger than /22. Have you done any
special tweaking to facilitate the /20s or have they just worked fine as is?
.....thx...........J
James Savage York University
Senior Communications Tech. 108 Steacie Building
jsav...@yorku.ca 4700 Keele Street
ph: 416-736-2100 ext. 22605 Toronto, Ontario
fax: 416-736-5830 M3J 1P3, CANADA
From: Ken LeCompte <lecom...@nbcs.rutgers.edu>
To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
Date: 12/16/2009 08:11 AM
Subject: Re: [WIRELESS-LAN] Private IP space for wireless users- anyone?
Sent by: The EDUCAUSE Wireless Issues Constituent Group Listserv
<WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU>
We are doing NAT/PAT at the edge with a firewall module in a 6500 for
our 5000 peak logged in users. We use four /20's to break up those
users across our wireless controllers. The wireless users are also not
the only ones being NATed at that firewall module. All of the dorm
wired users are NATed there too.
Thanks.
Ken
--
Ken LeCompte - Telecommunications Analyst
Rutgers University Office of Information Technology
Campus Computing Services - Central Systems and Services
Office ~ (732) 445-4823
On Dec 15, 2009, at 6:36 AM, Lee H Badman wrote:
> Thanks for all of the responses- I wonder if anyone with a peak
> usage like ours is doing NAT- almost 6500 clients?
>
> -Lee
> ________________________________________
> From: The EDUCAUSE Wireless Issues Constituent Group Listserv
> [wireless-...@listserv.educause.edu
> ] On Behalf Of Jason Appah [jason.ap...@oit.edu]
> Sent: Monday, December 14, 2009 11:03 PM
> To: WIRELESS-LAN@LISTSERV.EDUCAUSE.EDU
> Subject: Re: [WIRELESS-LAN] Private IP space for wireless users-
> anyone?
>
> Yes, that is what we do. I just wondered how big if a bear it would be
> to track pat in a university wireless environment.
>
> In a second related note, we recently changed our NAT timeout from 3
> to 2 hours as we were beginning to run out of 1 to 1 NAT ranges
>
> Sent from my iPhone
>
> Jason Appah
> Systems Administrator
> Oregon Tech
>
> On Dec 14, 2009, at 6:33 PM, "Phil Trivilino" <p...@stlawu.edu> wrote:
>
>> We do 1to1 dynamic NAT on the ASA firewall and log all the
>> translations to a syslog server. Easy to get the private ip from
>> the log given the time and global ip. It is all we've seen the need
>> for to this point.
>> Phil
>>
>> On Dec 14, 2009, at 8:55 PM, Lee H Badman wrote:
>>
>>> Wondering how many other schools are using private IP space for
>>> wireless users, how you accomplish the NAT, and what mechanisms you
>>> use for user tracking for the private-public mappings for forensic/
>>> investigatory purposes.
>>>
>>> Thanks-
>>>
>>> Lee
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