ZyXEL Communications P-2301R/RL-P1C User Manual

 

All contents Copyright (c) 2007 ZyXEL Communications Corporation.   

 

85 

Internal  IPs  is  sometimes  referred  to  as  virtual  IPs.  They  are  a  group  of  up  to  255  IPs  that  are  used  and 

recognized internally on the local area network. They are not intended to be recognized on the Internet. The real 

IP  from  ISP,  instead,  can  be  recognized  or  pinged  by  another  real  IP.  The  ZyXEL  device  Internet  Access 

Sharing Router works like an intelligent router that route between the virtual IP and the real IP. 

It depends on what kind of IP you have: Static or Dynamic. If your company has a domain name, it means that 

you have a static IP address. Suppose your company's e-mail address is xxx@mycompany.com. Joe and Debbie 

will be able to send e-mail through Prestige Internet Access Sharing Router using jane@mycompany.com and 

debbie@mycompany.com 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 right.   

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  address  is  mycompany@ispname.com.  Jane  and  John  will  be  able  to  send 

e-mail  through  Prestige  Internet  Access  Sharing  Router  using  "jane"<mycompany@ispname.com>  and 

"john"<mycompany@ispname.com> 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 right.   

The US 

Road Runner 

service requires the user to "log in" to the service before it  can send any packets to the 

outside  network.  This  is  apparently  implemented  in  the  TAS  (Toshiba  Authentication  System)  with  a  packet 

filtering firewall in the upstream direction. Before login, one can send ICMP packets (e.g., ping) to the outside 

Internet, but nearly all other upstream TCP and UDP packets are blocked. The user can only speak to the local 

DNS/login server. Downstream packets do not appear to be filtered or blocked at any time.    

While

 Standard 

service means the cable services which have no login requirement. Prestige supports both 

Road 

Runner & Standard 

services in menu 4 for connecting to cable ISPs.