----- Original Message -----
From: <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, December 03, 2000 11:52 PM
Subject: Re: [vox-tech] dsl ideas
> On Sun, 3 Dec 2000, Jay wrote:
>
> > I thought the idea behind 5 ips is:
>
> This is "an" idea... one of many possible...
>
> >
> > 1 ip firewall/NAT/Router/Gateway (3 NICs, 1 for external, 1 for your
internal, 1
> > for your DMZ
> >
> > DMZ
>
> Not sure what you mean by lumping "DMZ" with individual ip numbers... a
> DMZ is a network... a group of ip numbers.
>
> > 2 ips DNS
I mixed my metaphors, I was talking about the NICs on the firewall, 1 for
internet, 1 for DMZ, 1 for your internal network. 1 ip for your firewall to
communicate to the external world, the other 4 are the DMZ (which communicate
thru the firewall).
>
> Seems better to arrange for someone else to handle your backup DNS
>
I suppose, but don't you have to pay for that then?
> > 2 - pop/imap, HTTP, SMPT, and whatever else external services
>
> 5 ips arises because a 29 bit netmask leaves 3 bits for your network,
> which would be 8 addresses except that the network and broadcast addresses
> are usually reserved, and the isp needs to keep an address to configure
> the upstream router with. This is about the smallest practical network
> size.
Makes sense. Why isn't the netmask 36 bits? Isn't it 4 bytes long? How do I
figure out what the range of IPs I have if I know my netmask and I know the
first IP.
i.e. if I'm using netmask of 255.255.255.248 and my IP = 192.168.1.0
>
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