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Top Forums UNIX for Advanced & Expert Users What hostname is a client using? Post 302139993 by mugambo on Wednesday 10th of October 2007 09:12:23 AM
Old 10-10-2007
What hostname is a client using?

Is there a way to find out what name a client is using to connect to a server? For example: client is telnet'ing or ftp'ing to Server, using name (B and C resolve to the same IP). Can we, on the server B find out that the client used to connect? I have tried tcpdump, but it prints out destination host, not which is because the IP on the server resolves to file).
Test Your Knowledge in Computers #553
Difficulty: Medium
The standard input (stdin for short), standard output (stdout) and standard error (stderr) are three standard communication streams that are defined by most computer systems.
True or False?

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ypwhich(1)						      General Commands Manual							ypwhich(1)

ypwhich - determine which host is the current NIS server or map master. SYNOPSIS
ypwhich [-d domain] [-V1] [-V2] [hostname] ypwhich [-d domain] [-m[mname]] [-t[mapname]] ypwhich -x OPTIONS
Identifies which server is serving v.1 NIS protocol-speaking client processes. Identifies which server is serving v.2 NIS protocol-speak- ing client processes. If neither version is specified, ypwhich attempts to locate the server that supplies the current v.2 services. If there is no v.2 server currently bound, ypwhich attempts to locate the server supplying the v.1 services. Since NIS servers and NIS clients are both backward compatible, the user need seldom be concerned about which version is currently in use. Uses domain instead of the current domain. Finds the master NIS server for a map. No hostname can be specified with -m. The mname argument can be a mapname, or a nickname for a map. When mname is omitted, ypwhich provides a list of available maps. Inhibits nickname translation and is useful if there is a mapname identical to a nickname. Displays the map nickname table. This option lists the nicknames (mnames) that the command knows of, and indicates the mapname associated with each nickname. DESCRIPTION
The ypwhich command identifies the Network Information Service (NIS) server that currently supplies NIS services to an NIS client. It also identifies which NIS server is the master for a map. If invoked without arguments, ypwhich returns the host name of the NIS server for the local machine. If hostname is specified, ypwhich checks that machine to find out which NIS master it is using. Refer to ypfiles(4) and ypserv(8) for an overview of NIS. SEE ALSO
ypfiles(4), rpcinfo(8), ypserv(8), ypset(8) ypwhich(1)

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