P-2024 Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
31
What is the difference between the internal IP and the real IP from my ISP?
Internal IP addresses are also referred to as virtual IP addresses. They are a group of up to 255 IP addresses
that are used and recognized internally on the local area network. They are not intended to be recognized on the
Internet. The real IP address (or the public IP address) you obtain from the ISP, instead, can be recognized or
pinged by other real IP addresses. The P-2024 Internet Access Sharing ATA works like an intelligent ATA that
routes network traffic between the virtual IP addresses and real IP addresses.
How does e-mail work through the P-2024?
It depends on what kind of IP address you have: Static or Dynamic. If your company has a domain name, it
means
that
you
have
a
static
I
P
address.
Suppose
your
company's
e-mail address is [email protected]. Joe and
Debbie
will
be
able
to
send
e-mail
through
the
P-2024
using
[email protected] and [email protected] respectively
as their e-mail addresses. They will be able to retrieve their individual private and secure e-mail, if they have been assigned the proper access rights.
If your company does not have a domain name, it means that your ISP provides you with a dynamic IP address.
Suppose
your
company's
e-mail
addr
ess is [email protected]. Jane and John will be able to send respectively as their e-mail addresses. Again, they will be able to retrieve their individual private and secured
e-mail, if they have been assigned the proper access rights.
What is the difference between the 'Standard' and 'RoadRunner' service?
The Road Runner service is commonly used in the USA and it requires the user to "log in" to the service
provider network before Internet access is allowed. The most popular implementation is TAS (Toshiba
Authentication System) with a packet filtering firewall in the upstream direction. Before users are logged in,
they can send ICMP packets (that is, ping) to a remote host through the Internet. However, all outgoing
(upstream) TCP and UDP packets to the Internet are blocked. Thus users can access the local local DNS/login
server. Downstream packets (or packets from the Internet to the users) are not filtered or blocked.
With Standard service, no user login is required. This is commonly used with a cable modem. The P-2024
supports both Road Runner and Standard services in SMT menu 4 for connecting to the ISPs for Internet
connection.
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