R2511-HP MSR Router Series Terminal Access Configuration Guide(V5)

You can set some parameters of TCP connection, including the receive buffer size, send buffer size,

non-delay attribute, keepalive interval and transmission times.

Terminal buffer parameter configuration

You can set parameters for the terminal buffer, including whether to clear the buffer before receiving data,

receive buffer size, send buffer threshold, and the maximum size of data to be sent to the terminal at one

time.

Threshold for VTY switching failure times

When an RTC client needs to initiate a connection to an RTC server, it first initiates a connection to the

RTC server that corresponds to the VTY with the lowest number. If the number of connection failures

exceeds the threshold, the RTC client initiates a connection to the RTC server that corresponds to the VTY

with the second lowest number.

Receiver VTY switching rules

If the RTC server is configured to switch between VTYs based on priority (the lower the VTY number, the

higher the priority) and the VTY number corresponding to a new connection request is less than the VTY

number corresponding to the existing connection, the RTC server tears down the existing connection and

begins to use the new connection for communication. If the RTC server is not configured to perform VTY

switching based on priority and a connection is already established, the RTC server will ignore any new

connection request.

RTC terminal authentication

The RTC server can perform password authentication on RTC clients to enhance security. Authentication

succeeds only when the passwords configured on the RTC server and the RTC client match.

Terminal access VPNs

Terminal access supports VPNs. That is, some of the terminals connected to the router can be grouped in

one VPN domain and some other in another VPN domain. This allows a terminal to access the FEP or

remote router that is in the same VPN domain as the terminal.

Server connection authentication

In practice, some users need to use the FEP to perform necessary authentication on the connected router

to enhance data security. Two authentication modes are supported: character string-based

authentication and MAC-based authentication.

In character string-based authentication, which is similar to password authentication, the same

authentication character string is configured on the FEP and the router. To establish a connection with the

FEP, the router sends the authentication character string to the FEP, and the FEP checks whether the

authentication strings match. If yes, the authentication succeeds. If not, the authentication fails and the

connection attempt fails.

The difference between MAC-based authentication and character string-based authentication is that the

MAC addresses configured on the FEP and the router are the same. This MAC address is the MAC

address of an interface on the router (You can specify the MAC address with a command).

TCP RTC many-to-one transparent transmission

Some terminal devices, such as radars, need to share data between each other. RTC terminal access

provides many-to-one relay forwarding based on TCP. Routers connecting these terminals are connected

to one relay server, which copies and forwards data between routers.