usb means no firewall?

  • Thread starter Thread starter sharon
  • Start date Start date
S

sharon

hi everyone

i have a netcomm nb5 adsl modem that supports both usb and ethernet. the
modem provides a firewall.

according to my understanding of how things work, the firewall is provided
by the router. the router is only used when you connect through the
ethernet because several computers can be connected. the router is not used
when connected through the usb because there's only one computer. so
there's no firewall if connected through the usb.

is it how it works? thanks for your comments
 
sharon said:
hi everyone

i have a netcomm nb5 adsl modem that supports both usb and ethernet. the
modem provides a firewall.

according to my understanding of how things work, the firewall is provided
by the router. the router is only used when you connect through the
ethernet because several computers can be connected. the router is not used
when connected through the usb because there's only one computer. so
there's no firewall if connected through the usb.

is it how it works? thanks for your comments
Click to expand...

The USB is just another 'port' and can be used at the same time as the
ethernet port. In other words, it's 'routed'.

It's also on the firewall.
 
David Maynard said:
The USB is just another 'port' and can be used at the same time as the
ethernet port. In other words, it's 'routed'.

It's also on the firewall.
Click to expand...


You sure about that? I just had to install a brand new cable modem
(lightning got the old one) and the instructions specifically stated to use
one *OR* the other. Not both.

Lightning also fried all the PCI slots on the MOBO (due to a PCI LAN card)

At any rate, we were doing wireless networking at that location with the
computer closest to the router on a cat 5 cable.

With no way to get a cat 5 connection into the lighning hit computer, I had
to use USB. This eliminated everything else on the network until I replaced
the semi-smoked MOBO.


TFM®
 
TFM® said:
You sure about that? I just had to install a brand new cable modem
(lightning got the old one) and the instructions specifically stated to use
one *OR* the other. Not both.
Click to expand...

One or the other what? We're not mind readers.

The OP also didn't specify if his modem was connected to a router or if
he expects us to look up all the technical specs for his particular
modem and determine if it has router functionality and which type of
firewall it uses: SPI or just basic NAT. If it's the latter, and he's
not connected it to a router which provides SPI, he really should be
using a software firewall on his system.
Lightning also fried all the PCI slots on the MOBO (due to a PCI LAN card)

At any rate, we were doing wireless networking at that location with the
computer closest to the router on a cat 5 cable.

With no way to get a cat 5 connection into the lighning hit computer, I had
to use USB.
Click to expand...

USB to wireless adapter? Be specific please.
This eliminated everything else on the network until I replaced
the semi-smoked MOBO.


TFM®
Click to expand...


--
spammage trappage: remove the underscores to reply

I'm going to die rather sooner than I'd like. I tried to protect my
neighbours from crime, and became the victim of it. Complications in
hospital following this resulted in a serious illness. I now need a bone
marrow transplant. Many people around the world are waiting for a marrow
transplant, too. Please volunteer to be a marrow donor:
http://www.abmdr.org.au/
http://www.marrow.org/
 
hi everyone

i have a netcomm nb5 adsl modem that supports both usb and ethernet. the
modem provides a firewall.
Click to expand...

I"m not familiar with that "modem" but if it provides a
firewall in any configuration then it's not just a modem as
most "modems" are, but rather a multi-function device.

according to my understanding of how things work, the firewall is provided
by the router.
Click to expand...


Then it has a router built in?
the router is only used when you connect through the
ethernet because several computers can be connected. the router is not used
when connected through the usb because there's only one computer. so
there's no firewall if connected through the usb.

is it how it works? thanks for your comments
Click to expand...

It depends on how it achieves this USB connection. If it is
a client (modem) to host connection, no you wouldn't have
router functionality unless this is more integrated that I
would expect it to be, BUT if the USB is a terminating in a
network bridge inside the "modem", if the system sees the
USB connection as a network adapter, then yes it could
"potentially" be able to route and firewall that PC as well
as any on other ports.

OK... I took a look at the manual and see the following:

---------------------------------

"The NB5 can be connected via a USB cable or an Ethernet
cable or both. The reason for this is that
the USB connection is simply an ethernet simulation, as far
as your computer is concerned the USB
connection is an Ethernet connection, hence DHCP and other
protocols will work the same as for Ethernet."

---------------------------------

So from the above quote it does appear that the latter
option I'd proposed is that implemented, that it "should" be
able to firewall through USB because of the way it treats
the USB as a network connection.
 
TFM® said:
You sure about that?
Click to expand...

Yes, because I use a secret engineering trick: I google for and look at the
data sheet.

http://www.netcomm.com.au/Spec_Sheets/NB5_info.pdf

On the picture showing all the connections it specifically says "USB/RJ45
ports can be used simultaneously."
I just had to install a brand new cable modem
(lightning got the old one) and the instructions specifically stated touse
one *OR* the other. Not both.
Click to expand...

Then yours can't.

Can't say for sure because you didn't say what model your is but maybe it's
just a modem and not a modem/NAT router like the NB5 is.
 
Back
Top