350 Bridge question
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350 Bridge question

 
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argyle
Guest
Posted: Thu Dec 16, 2004 4:48 am    Post subject: 350 Bridge question Reply with quote
I have two buildings that I am bridging and they are about at most 250
yards apart. We were planning on bridging 3 buildings at first so we
are using omni-directional antennaes. The buildings have line of sight
but one roof line is lower than the other by 10 feet or so. At first
the bridges would associate then drop off with the "lost
authentication" message. Then they would pick up and then go down.
This would occur almost every minute. I then read about how the
bridges were a little problematic. So I tried a different bridge. It
works much better, but still drops the connection every 5 minutes or
so for about 10 seconds. The main question I have is this. Should
these bridges be able to pass DHCP? The clients on the non-root side
of the bridge cannot obtain any addresses. However, if I statically
assign them everything is ok.

Thanks in advance.

Trevor
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Erik Freitag
Guest
Posted: Thu Dec 16, 2004 5:04 am    Post subject: Re: 350 Bridge question Reply with quote
On Wed, 15 Dec 2004 15:48:04 -0800, argyle wrote:

Quote:
I have two buildings that I am bridging and they are about at most 250
yards apart. We were planning on bridging 3 buildings at first so we
are using omni-directional antennaes. The buildings have line of sight
but one roof line is lower than the other by 10 feet or so. At first
the bridges would associate then drop off with the "lost
authentication" message. Then they would pick up and then go down.
This would occur almost every minute. I then read about how the
bridges were a little problematic. So I tried a different bridge. It
works much better, but still drops the connection every 5 minutes or
so for about 10 seconds. The main question I have is this. Should
these bridges be able to pass DHCP? The clients on the non-root side
of the bridge cannot obtain any addresses. However, if I statically
assign them everything is ok.


If you look at cisco's range specs for the AP350:

Outdoor:


- 800 ft (244m) @ 11 Mbps


- 2000 ft (610m) @ 1 Mbps

You're getting close to the lower limit with your configuration at 750 ft.
Local interference, such as an A/C vent or another transmitter can reduce
this range. Are the APs locked at 11 Mbs? If so, they can't downshift to
extend their range. You might want to look at directional antennae.

Bridging doesn't affect DHCP, but is the router interface for the VLAN
that you're bridging configured with an IP helper address? If not, that
would prevent DHCP from working. Also, if your wireless LAN is on a
separate VLAN, which I think is a good idea, you should make sure your
DHCP server has a scope defined for the VLAN's subnet.
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Erik Freitag
Guest
Posted: Thu Dec 16, 2004 5:21 am    Post subject: Re: 350 Bridge question Reply with quote
On Wed, 15 Dec 2004 18:29:52 -0800, Erik Freitag wrote:

Quote:
On Wed, 15 Dec 2004 17:19:25 -0800, argyle wrote:

Erik, thank for the feedback so soon. However, I gather that you think
I am talking about the 350 access points? Or, are you referring to a
mode? Or a general term? I'm kind of new to the wireless game so
excuse my ignorance. If so, I am referring to the Cisco Aironet 350
Bridge.

The information I posted is for the AP350 workgroup bridge, as found here:

http://www.cisco.com/en/US/customer/products/hw/wireless/ps458/products_data_sheet09186a0080088833.html

Is your device something ELSE called an Airport 350?

Correction: Aironet 350. Sorry.
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Erik Freitag
Guest
Posted: Thu Dec 16, 2004 5:21 am    Post subject: Re: 350 Bridge question Reply with quote
On Wed, 15 Dec 2004 17:19:25 -0800, argyle wrote:

Quote:
Erik, thank for the feedback so soon. However, I gather that you think
I am talking about the 350 access points? Or, are you referring to a
mode? Or a general term? I'm kind of new to the wireless game so
excuse my ignorance. If so, I am referring to the Cisco Aironet 350
Bridge.

The information I posted is for the AP350 workgroup bridge, as found here:

http://www.cisco.com/en/US/customer/products/hw/wireless/ps458/products_data_sheet09186a0080088833.html

Is your device something ELSE called an Airport 350?
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PES
Guest
Posted: Thu Dec 16, 2004 5:21 am    Post subject: Re: 350 Bridge question Reply with quote
argyle wrote:
Quote:
Erik, thank for the feedback so soon. However, I gather that you think
I am talking about the 350 access points? Or, are you referring to a
mode? Or a general term? I'm kind of new to the wireless game so
excuse my ignorance. If so, I am referring to the Cisco Aironet 350
Bridge.

Thanks,
Trevor


I agree, this looks like specs for ap's. I think you should be able to
get up into the miles at 11Mb. However, I frequently experience (I
think the terminology is) holdoffs even in a span of 300-400 yards.
Also, the 11mb does not perform like a 10Mb ethernet network. There is
increasingly a problem with interference in the 802.11 range that is
adding to problems like this. However, I think there is another issue
with dhcp. Maybe spanning tree protocol running on the switch closest
to the clients. The bridges should pass dhcp.

--
-------------------------
Paul Stewart
Lexnet Inc.
Email address is in ROT13
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argyle
Guest
Posted: Thu Dec 16, 2004 5:21 am    Post subject: Re: 350 Bridge question Reply with quote
Erik, thank for the feedback so soon. However, I gather that you think
I am talking about the 350 access points? Or, are you referring to a
mode? Or a general term? I'm kind of new to the wireless game so
excuse my ignorance. If so, I am referring to the Cisco Aironet 350
Bridge.

Thanks,
Trevor
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argyle
Guest
Posted: Thu Dec 16, 2004 10:45 pm    Post subject: Re: 350 Bridge question Reply with quote
Again. Thanks for all the feedback. It is the Aironet 350 Bridge.
Not the workgroup bridge. I read through some of the specs last night
and see that it should be able to push miles. The basic config is as
follows. Building 1 has an Internet connection coming into a
SonicWall. The SonicWall is handing out dhcp to a handful of access
points on the building and the root bridge. About 200 yards away is
the second building with some other access points and the other bridge
configured as a non-root without clients. All devices are on the same
subnet of 192.168.25.x. If I statically assign my IP on my laptop in
the second building I can get out to the Internet. However, I can't
get an IP through dhcp.

Does this info help?

Thanks again,
Trevor
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