RDNS Queries


 
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Old 02-10-2014
RDNS Queries

Hey everyone,

I have a question, I've been playing around with tcpdump, and noticed my machine making numerous rdns look ups. They are displayed like:

Code:
10.80.80.141.51234 > 10.80.80.1.domain: 9950+ PTR? 223.114.55.65.in-addr.arpa. (44)

My question is, if dns works based on numerical addresses... why does my machine care what the domain name of a site is..? And where are these requests coming from? I'm obviously not the one typing the addresses into my browser?
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CDPLAY(1)						      General Commands Manual							 CDPLAY(1)

NAME
cdplay - play audio compact disks SYNOPSIS
cdplay [ -a]|[-r] DESCRIPTION
Cdplay is an audio-cdplayer it can be used interactively or non-interactively. With no flags cdplay is used interactively. When used inter- actively cdplay can be either in non-playing or playing mode. In non-playing mode you can select tracks to be played. In playing mode cdplay shows the track-time, remaining track-time, total-time and remaining total-time. Cdplay assumes the drive to be at /dev/cd0. During non-playing mode the following commands are available: cursor-up/down browse through the track-list spacebar add track to the play-list backspace remove a track from the play-list s start playing the tracks in the play-list. When the play-list is empty start playing from the current position in the track-list until the end of the cd p play the track on the current position in the track-list r play all tracks in a random order (shuffle play) e exit cdplay During playing mode the following commands are available: s stop playing, return to non-playing mode spacebar pause/resume current track cursor-up/down skip to next/previous track OPTIONS
When one of these options is used cdplay does everything in the background. -a Play all tracks, cdplay tells the drive to play all tracks and then it immediately returns to the user -r Play all tracks in random order (shuffle play). Cdplay forks of a new process which starts up a track, during that track it sleeps. When the track is finished it wakes up to start the next track and goes to sleep again. The parent process immediately returns to the user. BUGS
Cdplay does not sense if a cd has changed, so don't switch cd's. If you want to play another cd you have to insert the new cd and start cdplay again. AUTHOR
Michel R. Prevenier (mrpreve@cs.vu.nl) CDPLAY(1)