Справочник Пользователя для Dynalink RTA1025W

ADSL Router User Manual 

 

The ADSL Router uses private IP addresses by assigning them to the LAN that cannot be directly 
accessed by the Internet or remote server. To access the Internet, private network should have an 
agent to translate the private IP address to public IP address. 

Public IP addresses are LAN IP addresses that can be considered “legal” for the Internet, 
because they can be recognized and accessed by any device on the other side of the DSL 
connection. In most cases they are allocated by your ISP.   

If you are given a range of fixed IP addresses, then one can be assigned to the router and the 
others to network devices on the LAN, such as computer workstations, ftp servers, and web 
servers. 

A PVC is a logical point-to-point circuit between customer sites. PVCs are low-delay circuits 
because routing decisions do not need to be made along the way. Permanent means that the 
circuit is preprogrammed by the carrier as a path through the network. It does not need to be set 
up or turned down for each session. 

RIP is a routing protocol that uses the distance-vector routing algorithms to calculate least-hops 
routes to a destination. It is used on the Internet and is common in the NetWare environment. It 
exchanges routing information with other routers. It includes V1, V2 and V1&V2, which controls 
the sending and receiving of RIP packets over Ethernet. 

UDP is a connectionless transport service that dispenses with the reliability services provided by 
TCP. UDP gives applications a direct interface with IP and the ability to address a particular 
application process running on a host via a port number without setting up a connection session. 

You can designate virtual servers, e.g., a FTP, web, telnet or mail server, on your local network 
and make them accessible to the outside world. A virtual server means that it is not a dedicated 
server -- that is, the entire computer is not dedicated to running on the public network but in the 
private network. 

A VPI is a 8-bit field while VCI is a 16-bit field in the ATM cell header. A VPI identifies a link 
formed by a virtual path and a VCI identifies a channel within a virtual path. In this way, the cells 
belonging to the same connection can be distinguished. A unique and separate VPI/VCI identifier 
is assigned in advance to indicate which type of cell is following, unassigned cells, physical layer 
OAM cells, metasignaling channel or a generic broadcast signaling channel. Your ISP should 
supply you with the values.