tcp-environ
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NAME
tcp-environ - TCP-related environment variables
DESCRIPTION
The following environment variables
describe a TCP connection.
They are set up by
tcp-env,
tcpclient,
and
tcpserver.
Note that
TCP(6)LOCALHOST,
TCP(6)REMOTEHOST,
and
TCP(6)REMOTEINFO
can contain arbitrary characters.
- PROTO
-
The string
TCP
or
TCP6.
- TCPLOCALHOST
-
The domain name of the local host,
with uppercase letters converted to lowercase.
If there is no currently available domain name
for the local IP address,
TCPLOCALHOST
is not set.
- TCPLOCALIP
-
The IPv4 address of the local host, in dotted-decimal form
or the respective compactified IPv6 address.
- TCPLOCALPORT
-
The local TCP port number, in decimal.
- TCPREMOTEIP
-
The IPv4 or the compactified IPv6 address of the remote host.
- TCPREMOTEPORT
-
The remote TCP port number.
- TCPREMOTEHOST
-
The domain name of the remote host,
with uppercase letters converted to lowercase.
If there is no currently available domain name
for the remote IP address,
TCPREMOTEHOST
is not set.
- TCPREMOTEINFO
-
A connection-specific string, perhaps a username,
supplied by the remote host
via 931/1413/IDENT/TAP.
If the remote host did not supply connection information,
TCPREMOTEINFO
is not set.
- TCP6INTERFACE
-
The interface name ("eth0") for IPv6 connections using link-local
addresses.
- TCP6LOCALIP
-
The IPv6 address of the local host in compactified IPv6 address.
- TCP6REMOTEIP
-
The compactified IPv6 address of the remote host.
- TCP6LOCALPORT
-
and
- TCP6LOCALHOST
-
as well as
- TCP6REMOTEPORT
-
and
- TCP6REMOTEHOST
-
are identical to their IPv4 counterparts.
SEE ALSO
tcpclient(1),
tcpserver(1),
tcp-env(1),
tcp(4)
Index
- NAME
-
- DESCRIPTION
-
- SEE ALSO
-
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Time: 13:39:03 GMT, July 14, 2025