Archived from groups: alt.video.ptv.tivo (
More info?)
In article <d0o3ri$e49$1@news01.intel.com>,
Brad Houser <bradDOThouser@intel.com> wrote:
>> if there's a way to configure the Netgear, I would like to try, but I
>> haven't had any luck so far. If I don't get it working within few days,
>> it's going back to Best Buy. The Netgear is a WGR614v5.
>
>Neither of your routers will act as a bridge. The wireless routers get their
>internet connection from the wired side. Bridges will only work with
>compatible routers.
I think there is, unfortunately, some blurring of terminology going on
here which is confusing the issue. It's probably the fault of some
company's marketing department for mis-using the word "bridge".
In normal networking terminology, a "bridge" is a device with two
Ethernet interfaces. It can receive Ethernet packets on one
interface, and retransmit them on the other (or in some cases
retransmit them back out the same interface). It can do so without
regard for the higher-level protocol (e.g. IP, AppleTalk, NetBEUI,
etc.) wrapped in the Ethernet packet. Bridging is largely transparent
to the Ethernet devices whose packets are being forwarded - they need
not be aware of the presence of the bridge. A bridge makes two
physically-discontigous Ethernet segments look like a single Ethernet.
A "router" is a higher-level (IP-level, usually) device. It also has
two or more interfaces (often but not always Ethernet), and each such
interface has its own IP address. The interfaces are typically
connected to different IP networks (different network numbers,
possibly different net-masks). The router can receive packets from
systems on one IP network, and route/forward them onto another network.
Devices which are using a router for packet forwarding *must* be aware
of the router, and voluntarily send the packets to the router for
forwarding (i.e. each device learns the Ethernet interface address of
the router's port on that network, and sends the packet to that
interface rather than to the Ethernet interface of its ultimate
destination).
All of the above applies to Ethernet and IP in general.
Then, there comes 802.11 of its various flavors. It's possible for
802.11b/g devices to operate in "ad hoc" mode, where each of them
sends packets directly to another - this is the wireless equivalent of
a simple twisted-pair wired LAN.
Very few people use ad hoc mode. It's generally felt to be suitable
only for relatively small, simple networks.
Almost everybody uses "infrastructure" mode. In this mode, 802.11
nodes are broken into two classes - access points, and clients.
Clients speak directly *only* to access points - they don't speak to
one another.
Access points will forward packets between wireless clients - they act
as Ethernet-level bridges on their wireless side (retransmitting
packets out of the same interface from which it arrived). They will
also usually act as Ethernet-level bridges between the wired and
wireless interfaces.
Access points may also incorporate IP-level router functionality.
They may have a "WAN" interface which hooks up to a cable modem, DSL,
or other Ethernet.
A lot of the small/home-office devices sold todays are all of these:
802.11 WAP (with wireless-to-wireless bridging), wired-to-wireless
bridge, and IP router. Extra functions such as IP firewalling and a
DHCP or print server are also built in sometimes.
Now, there comes the confusion: the device called a "wireless
bridge". This is a device which is an Ethernet-level bridge, where
one of the interfaces is an 802.11b/g card or radio which is operating
as a client.
To make matters even more confusing, there are (I believe) some WAPs
on the market which can be configured to operate either as normal
WAPs (802.11 infrastructure-mode access points with Ethernet-level
bridging) or as "wireless bridges" (802.11 infrastructure-mode clients
of another access point, with both it and the AP to which it's
associated acting as Ethernet bridges).
There are even some which can operate in both modes at once, I think -
they're an infrastructure access point using one radio and antenna,
and an infrastructure client on a different network using a second
radio and antenna.
Confusing things even further is the "wireless repeater" or "range
extender", which uses a special very-low-level 802.11 packet
forwarding mechanism which actually lies "beneath" the Ethernet level.
These are fairly uncommon, expensive, and not all 802.11 cards will
know how to work with them).
Devices which can operate as 802.11b clients, and Ethernet-level
bridges ("wireless bridges" in marketing-speak) don't *need* to be
more expensive than normal 802.11b WAPs - they use the same radio,
pretty much the same firmware, and they both implement the same
Ethernet-level bridging functions. Arguably they're technically
easier to implement, since their firmware doesn't need to implement
access-point functionality. However, for reasons that I suspect have
to do with the low number which are sold, they're uncommon and
expensive. Very few vendors seem to bother building this
functionality into their standard WAPs, although it's not technically
difficult to do.
--
Dave Platt <dplatt@radagast.org> AE6EO
Hosting the Jade Warrior home page:
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