[wellylug] saturn cable connection with linux

[Don Jones]

Hmmm

Im getting a saturn cable modem installed on Friday

> You plug your ethernet card into the cable modem 
using the ethernet 
> cable they provide.

Is this a X-over do you know?

> Saturn give you an IP address, a netmask, a 
gateway address and two dns 
> servers. 

Whats the netmask?

The description suggests that the saturn cable 
"modem" is just a bridge/media converter/layer2 
device. Has anyone investigated this? Essentially 
the whole cable network is one big LAN. This 
suggests that anyone who plugs the "modem" strait 
into a hub with a number of hosts on it is 
essentialy an extension of the lan. Except with a 
bridge in between. So presumably it filters 
incomming frames at the "modem" based on its 
external MAC address. That will allow filtering of 
inbound frames (ie you wont be able to sniff traffic 
on the main LAN beyond the bridge). But what about 
frames comming from internal hosts in the hubbed 
setup described above, how does the bridge decide 
which frames to forward? Either it forwards then all 
and you have internal addresses out on the main 
segment or does it do some kind of arp or deny any 
ip addresses in the internal range? - whatever - 
either would bump it up to a layer 3 device - anyone 
know?? 

I wonder what the specs of the segment are - is it 
real ethernet (anyone know what type?) - 100Mbps or 
Gigabit (its probably 1544Mbps or something)? Could 
you hack together a connector to bypass the modem - 
like a bnc 10base2 card running at whatever the 
segments speed is? or some type of coax to cat5 
media convertor running at the right speeds.

Forgive my ramblings - but Im curious ;)

Don Jones

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