[c-nsp] Client DHCP Server

[Paul Stewart]

Does the Airspan equipment not support filtering?  Almost all Wimax/BBW gear
I work on has filtering for PPPOE, DHCP, Netbios etc. so someone can't
plugin their router backwards and create havoc...

Paul


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Church, Charles
Sent: November 2, 2008 8:22 AM
To: Mohammed Dado
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Client DHCP Server

I'm assuming your network is a LAN at the customer site, with a Wimax
bridged connection back to the 7500, so the 7500 interface is the
default gateway for the LAN.  If so, I don't believe there is anything
you can configure on the 7500 to stop DHCP clients on the LAN from
obtaining addresses from a DHCP server (wifi router) also located on the
LAN.  Or is your 7500 acting as a bridge, and a customer DHCP server is
affecting multiple customers?  That can be fixed by some changes on the
7500. 

Chuck

-----Original Message-----
From: Mohammed Dado [mailto:mdado at Airspan.com] 
Sent: Sunday, November 02, 2008 8:11 AM
To: Church, Charles
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Client DHCP Server


I've tried  turning of the DHCP server on the wifi routers, but there's
a problem in some of them that the option of turning this service off is
already missed. What about using some supported features by the
ISP-router to stop this DHCP requests from happening ?


Best Regards,

Mohammed Dado
Technical Support Engineer - EMEA

Airspan Communications Ltd



-----Original Message-----
From: Church, Charles [mailto:cchurc05 at harris.com]
Sent: 02 November 2008 14:58
To: Mohammed Dado
Cc: cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Client DHCP Server

As you probably know, a DHCP server without some getting some help from
the routers is only going to serve addresses on the network it's located
on.  Assuming this is on the customer prem, you're probably not going to
see them at the 7500 end.  Do you have a topology diagram?  Any reason
you can't tell the customers to turn off DHCP server on the wifi
routers?  Unless you've got a DHCP-snooping-capable switch located on
each customer network, you probably can't use that.

Chuck


-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Mohammed Dado
Sent: Sunday, November 02, 2008 6:52 AM
To: Simon Lockhart
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Client DHCP Server


Access NW is WiMAX. Cisco hardware at the ISP end is Cisco 7500 Series.


Best Regards,

Mohammed Dado
Technical Support Engineer - EMEA

Airspan Communications Ltd



-----Original Message-----
From: Simon Lockhart [mailto:simon at slimey.org]
Sent: 02 November 2008 13:34
To: Mohammed Dado
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Client DHCP Server

On Sun Nov 02, 2008 at 11:26:10AM +0000, Mohammed Dado wrote:
> I have a customer facing a problem that his end-user WiFi router's are
> issuing  IP addresses ! I'm under the impression that this could be
stopped
> by the DHCP snooping binding configurations in the ISP end. Any ideas
?

Before anyone can try to speculate on how to solve such a problem,
you'll
need to provide more information, such as what the access network
technology
is, what Cisco hardware you have at the "ISP end".

Simon
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