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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: Street Walker who wrote (848)	5/26/1998 2:49:00 AM
From: Dirk Hente	Read Replies (1) \| Respond to of 14778

Let me add some thoughts about NAT/Proxy/Firewall. I did some extensive search on this on the net but the matter is still not clear to me. Sure, you can use a proxy server to 'share' your internet connection. This is because a proxy can do NAT as well, but maybe only for a few protocols. Sure you can use a Firewall software because some Firewalls use NAT. And finally, you can use these small 'NAT' only programs. But all have one thing in common: they add some overhead. Is there any chance to get around this? I think no. Sure, when you use unregistered IP numbers for your LAN you need NAT which implies overhead. OK, then you may want to buy a bunch of IP adresses for your LAN, but then you'll run into a security problem. This in turn means you need a firewall. So, finally you have nothing gained. My conclusion is, no matter you you turn it when you want to connect your LAN to the met you add overhead. So whats then the best product to buy? A proxy server, a firewall, a NAT only program? I really have no idea. But i read some test about the performance influence of NAT, like this one: data.com I read another one (i a thesis about NAT) and they all are talking abpout speeds of several hundreds of Kbits/sec and MBits/sec. This all is well beyond the capacity of my small ISDN connection. So, if you use high bandwidth connections overhead is an issue for you. But do you really need a high bandwidth for day trading? I dont think so.I know that NASDAQ is disseminating level 2 quotes in real time over three 56k lines. Another example is the recommened bandwidth for the ISLAND trading system for order entry based on O.U.C.H: they say aone 56kb line is sufficient. This is telling me, that you dont need top bandwidth like adsl or so to do daytrading. BTw there was a nice post (#reply-4390613) on the Cybertrader thread addressing this topic. Unfortunetly, there was never a reply of PRB concerning Cyber's maximum data rate.

To: Street Walker who wrote (848)	5/26/1998 1:20:00 PM
From: Howard R. Hansen	Respond to of 14778

>>If I'm in constant download all day long on 2 computers both running 4 monitors full of Kill Keys, will I notice a difference if they both shared the same internet connection via a proxy/nat? That's my big question (may have to try it out and see if its adequate for me. I can always add another internet account, but don't if NAT will work.) Dirk has not noticed a difference, but I don't know if he is using level II on multiple stocks.<< If in the worse case you find network address translation software slows down your internet server significantly then as an alternative you could add another computer to your setup instead of getting another internet account. This could be one of these less than $1000 PCs being advertised now or even an old PC you now own. Sygate says their NAT software will run on a 486 PC with 16 megabytes of memory. Over a 2 year period buying a low cost PC is cheaper then paying for another InterNetJet account at $50 per month.