IP
6.5.1 Telnet and Rlogin Sessions
Telnet is an industry-standard protocol that enables users anywhere on a network to access a remote host
and start a terminal session. Telnet connections do not require that either end of the connection know the
hardware/software used on the other end; for example, if user Bob connects to host athena's platform (see
Figure 6-20), athena doesn't know what terminal type Bob is using, and Bob doesn't know athena's
platform or operating system.
Terminal
Rlogin connections are similar to Telnet connections, however, Rlogin enables trusted users to log into a
host without password verification.
6.5.1.1 Outgoing Telnet/Rlogin Connections
To establish an outgoing Telnet connection, use the Telnet command. To establish an outgoing Rlogin
connection, use the Rlogin command. Either a text host name or an IP address may be specified.
Local>> TELNET athena
Local>> TELNET 192.0.1.15
Local>> RLOGIN 192.0.1.15
For information on resolving host names, see Name Resolving on page 6-6.
Note:
By default, Telnet and Rlogin connections will be made to a preset port number. To connect to a different
port number, use the Telnet/Rlogin commands in conjunction with a port number (prefaced by a colon).
Local>> TELNET athena:145
Figure 6-20: Telnet Connections
Modem
Figure 6-21: Outgoing Telnet/Rlogin Connections
Figure 6-22: Telnetting to a Specific Port Number
6-9
Modem
receive
transmit
1
2
3
4
5
6
7
8
9
10
Host "athena"
Terminal
Establishing Sessions
activity
ok
100
link
power
11
12
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16
reset
# aui
10/100
SCS
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