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Possible to route small ISP through a cable modem w/ limited IPs?

C

Chewbaccax

Senior member
I'm thinking about starting a VERY small ISP. My cable modem provides about the same amount of bandwidth as a T1, but my AT&T @Home service limits me to 3 or 4 IPs. Is it possible to route those IPs to provide access to 8-10 56k connections?

Thanks,

Chewbacca
 
Do you have 8-10 modems and telephone lines available for those 8-10 people who will be dialing in to your computer?
 
You can actually setup a NAT router that you can give 254 concurrent connections to.

But, if you do not have the phone lines to set it up, then you cannot do this.
 
Shadow07,

I had thought that a NAT router would work. AFAIK, there doesn't seem to be any reason why I couldn't get 8-10 phone lines/modems. All it takes is $. I'll get a quote from the phone company before I really do anything with this. I've heard its about $50/month for each business line, probably a healthy (for Qwest) install fee as well.

Thanks,

Chewbacca
 
normal biz phone lines arent going to work for you, you're going to need a channelized (frac) t1 as normal 56k modems arent really 56k modems, they can only send at 336, so you're going to need to plug into a terminal server such as a as5300 or pm3 or something along those lines.
 
goldboyd,

I thought the T1 was for the upstream connection? Anyway, as far as the modems, I have a chance to buy a USR Total Control Enterprise Hub w/ 48 digital 33.6 modems (upgradeable to 56K for $1000) for a decent price. I'm assuming these would be able to send and receive at 56k? Would there be a way to setup a NAT router linux box to the USR?

Thanks,

Chewbacca
 
Also remember that if for any reason you draw the attention of @Home then your service can (and likely would) be terminated. Doesn't happen often, but if one of those people does something stupid (messes with IP's, hack/phreaks, ARP trouble) or even if it increases the bandwidth usage (which is actively monitored) then NOC may take a look and that's the end, not only of your little ISP, but of your @Home connection permanently.
 
Yeah, the more I think about it, the more it seems like a dumb idea. I guess I'll leave it to the people who can do it properly. It just seems amazing that for $40/month I can get the bandwidth that a small ISP might pay $500-$1000 month for. Anyway...on to more fruitful projects!

Thanks for the info guys,

Chewy
 
As with most calbe systems, maximum theoretical and realworld bandwidth are two different things. See how your modem does at the peak hours and then decide (sounds like you already decided against it) if you really want to share the smaller bandwidth with clients directly taking from your bandwidth.
 
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