[cumbria_lug] Windows Network Noise on the Net.
Ian Linwood
ian_linwood_clug at dinwoodie.freeuk.com
Wed Dec 22 09:36:40 GMT 2004
Hello Steve,
Wednesday, December 22, 2004, 1:29:14 AM, you wrote:
S> Hmmmmm... got me wondering there as well (yes I know what I said
S> earlier that I'm not adding to the noise on the net)... I know I'm not
S> broadcasting netbios crap to the outside world from my router logs - not
S> a peep of it in sight, yet I don't have any specific iptables for it
S> (though I did!!!).
S> I think I'm right in thinking that netbios crap is only broadcast on the
S> local subnet?
Nil point! You are thinking of Netbeui. Netios travels over tcpip, and
can be routed.
S> If so, then as my firewall/router is acting as gateway
S> between two subnets and the stuff is only forwarded if and when I
S> specifically address a machine on the other side, then I'm not actively
S> sending it out anyway or need to actively block it (per-se).
S> Which I suppose means, that anyone using a router with a private IP
S> range (192.168.x.x, 10.x.x.x, etc) NAT'd to the outside world won't have
S> the annoying netbios traffic forwarded.
All wrong!
S> Using a dialup modem however would be a completely different matter, as
S> the machine is on the net directly, and the local subnet *is* the
S> internet!!!
Still wrong!
S> Also, using a bridge to pass traffic would have a similar problem to a
S> dial-up modem, as both sides of the bridge would be on the same subnet,
S> so the netbios traffic would be forwarded.
Still wrong. A bridge will pass ALL traffic, unless a specific filter is employed!
S> I feel like I'm doing Networking 101 here... have I got it about right
S> though is the interesting question?
What do you think! :-(
--
Best regards,
Ian
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