JiscMail Logo
Email discussion lists for the UK Education and Research communities

Help for WIRELESS-ADMIN Archives


WIRELESS-ADMIN Archives

WIRELESS-ADMIN Archives


WIRELESS-ADMIN@JISCMAIL.AC.UK


View:

Message:

[

First

|

Previous

|

Next

|

Last

]

By Topic:

[

First

|

Previous

|

Next

|

Last

]

By Author:

[

First

|

Previous

|

Next

|

Last

]

Font:

Proportional Font

LISTSERV Archives

LISTSERV Archives

WIRELESS-ADMIN Home

WIRELESS-ADMIN Home

WIRELESS-ADMIN  April 2010

WIRELESS-ADMIN April 2010

Options

Subscribe or Unsubscribe

Subscribe or Unsubscribe

Log In

Log In

Get Password

Get Password

Subject:

Re: WLAN Upgrade

From:

Jeff Fern <[log in to unmask]>

Reply-To:

Wireless Issues in the JANET community <[log in to unmask]>

Date:

Fri, 16 Apr 2010 10:18:33 +0100

Content-Type:

text/plain

Parts/Attachments:

Parts/Attachments

text/plain (46 lines)

Jethro R Binks wrote:
> On Tue, 13 Apr 2010, David Pick wrote:
> 
>> But there's another "trick" they pull on the wired side: they expect the 
>> controller to have an IP address on each VLAN to which clients can be 
>> assigned, and they "fiddle" with ARP responses so that the clients are 
>> told that the MAC address associated with the default gateway is the 
>> controller rather than the real default gateway, and then they re-write 
>> packets to get them to the actual default gateway for the subnet. This 
>> doesn't live nicely on our network, and may not on yours; watch out for 
>> it.
> 
> Can you elaborate on what aspect of your network it is that means this 
> trick doesn't work so well for you?

On a network where the DHCP server is configured to offer all addresses
within a subnet (except for itself/default gateway) some reconfiguration
is needed to make a space for the Meru controller (the controller cannot
request an address via DHCP). On some networks this isn't a problem -
however it is for our network.

We have a VLAN with a /21 allocation (public IP space). The IP address
allocated by the DHCP server is in the format 10.x.y.1 where x.y
correspond to the last 2 parts of the public IP address and we
one-to-one NAT between the two.

Each 10.x.y.1 is part of a /30 subnet where the only other address is an
alias on the router. Yes, our router has LOTS of alias addresses. We do
this so we can apply firewall rules to all inter-client traffic.

We have a script which builds the DHCP config and creates the alias
addresses etc.

To give the Meru controller an address on this VLAN, we would need to
modify our script (not trivial) and the Meru controller would deliver
inter-client traffic directly without going through our router (so we
would also need to re-create all the firewall rules within the Meru
controller as well).

There are some other potential problems if we decided to load balance
and not have all default routes going via the same physical router as
the Meru controller would send all off-net traffic to it's default route
rather than the client's default route.

-Jeff

Top of Message | Previous Page | Permalink

JiscMail Tools


RSS Feeds and Sharing


Advanced Options


Archives

April 2024
February 2024
January 2024
December 2023
November 2023
October 2023
September 2023
August 2023
May 2023
March 2023
February 2023
January 2023
December 2022
November 2022
October 2022
September 2022
July 2022
May 2022
March 2022
February 2022
January 2022
December 2021
November 2021
October 2021
September 2021
August 2021
July 2021
June 2021
May 2021
April 2021
March 2021
February 2021
January 2021
December 2020
November 2020
October 2020
September 2020
July 2020
April 2020
February 2020
January 2020
December 2019
November 2019
October 2019
September 2019
August 2019
July 2019
June 2019
May 2019
April 2019
March 2019
February 2019
January 2019
December 2018
November 2018
October 2018
September 2018
August 2018
July 2018
June 2018
March 2018
October 2017
September 2017
August 2017
July 2017
June 2017
May 2017
April 2017
March 2017
February 2017
January 2017
December 2016
November 2016
October 2016
September 2016
August 2016
July 2016
June 2016
May 2016
April 2016
March 2016
February 2016
January 2016
December 2015
November 2015
October 2015
September 2015
August 2015
July 2015
June 2015
May 2015
April 2015
March 2015
February 2015
January 2015
December 2014
November 2014
October 2014
September 2014
July 2014
June 2014
May 2014
April 2014
March 2014
February 2014
January 2014
December 2013
November 2013
October 2013
September 2013
August 2013
June 2013
May 2013
April 2013
March 2013
February 2013
January 2013
December 2012
November 2012
October 2012
September 2012
August 2012
July 2012
June 2012
May 2012
April 2012
March 2012
February 2012
January 2012
December 2011
November 2011
October 2011
September 2011
August 2011
July 2011
June 2011
May 2011
March 2011
February 2011
January 2011
December 2010
November 2010
October 2010
September 2010
August 2010
July 2010
June 2010
May 2010
April 2010
March 2010
February 2010
January 2010
December 2009
November 2009
October 2009
September 2009
August 2009
July 2009
June 2009
May 2009
April 2009
March 2009
February 2009
January 2009
December 2008
November 2008
October 2008
September 2008
August 2008
July 2008
June 2008
May 2008
April 2008
March 2008
February 2008
January 2008
December 2007
November 2007
October 2007
September 2007
August 2007
July 2007
June 2007
May 2007
April 2007
March 2007
February 2007
January 2007
2006
2005
2004
2003


JiscMail is a Jisc service.

View our service policies at https://www.jiscmail.ac.uk/policyandsecurity/ and Jisc's privacy policy at https://www.jisc.ac.uk/website/privacy-notice

For help and support help@jisc.ac.uk

Secured by F-Secure Anti-Virus CataList Email List Search Powered by the LISTSERV Email List Manager