Cable Modems Firewalling a cable modem

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Subject Author Date
Firewalling a cable modem Michael Kamp 03-23-07
Posted by Michael Kamp on March 23, 2007, 8:32 am
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Hi,

we have a Toshiba Cable modem for Internet Access (in Germany). Do these
cable modems have something like a simple firewall that drops packets
that come from outside? I am not aware of any method to manage that
modem (no browser or ssh access).
Without any kind of that functionality or at least a router at the cable
modem port, I guess the (single) computer behind the cable modem is very
easy to attack, right? In that case, I should buy a firewall, right?

Thanks a lot!
Michael

Posted by $Bill on March 23, 2007, 8:57 am
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Michael Kamp wrote:
> Hi,
>
> we have a Toshiba Cable modem for Internet Access (in Germany). Do these
> cable modems have something like a simple firewall that drops packets
> that come from outside? I am not aware of any method to manage that
> modem (no browser or ssh access).
> Without any kind of that functionality or at least a router at the cable
> modem port, I guess the (single) computer behind the cable modem is very
> easy to attack, right? In that case, I should buy a firewall, right?

Buy a cheap wireless G router with a 4-port switch. You can just
plug your PC into it and later if you get a laptop you're ready to
go. They're like $40-$50 for a Netgear/Linksys. Run a free or
cheap software firewall (or the one that comes with some Windoze
OSs - like XP) and that covers you for spyware trying to get out
from your PC - the router will handle the incoming stuff.

Posted by Michael Kamp on March 23, 2007, 9:13 am
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Thanks.

So in theory it is true, that any packets on any ports are passed
through the cable modem to my pc, right? Any unpatched OS can be easily
attacked this way, right?
Michael

Posted by $Bill on March 23, 2007, 9:23 am
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Michael Kamp wrote:
> Thanks.
>
> So in theory it is true, that any packets on any ports are passed
> through the cable modem to my pc, right? Any unpatched OS can be easily
> attacked this way, right?

Let's put it this way - the modem does very little other than form
a bridge between the two networks. It would depend on the OS how
vulnerable it is.

Posted by Todd H. on March 23, 2007, 10:42 am
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> Thanks.
>
> So in theory it is true, that any packets on any ports are passed
> through the cable modem to my pc, right? Any unpatched OS can be easily
> attacked this way, right?

Yes.

--
Todd H.
http://www.toddh.net/

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