Linux – Understanding /var/log/messages entries

d-buslinuxlogs

192.168.25.1 = router

192.168.10.1 = gateway/modem

192.168.25.144 = this pc (which is 'linuxpc' running fedora 17)

What happened during these log entry events below? Specifically what do the last two log entries mean. 

Oct 10 13:24:22 linuxpc dhclient[5779]: DHCPREQUEST on p14p1 to 192.168.25.1 port 67 (xid=0x466a6633)
Oct 10 13:24:22 linuxpc dhclient[5779]: DHCPACK from 192.168.25.1 (xid=0x466a6633)
Oct 10 13:24:22 linuxpc dhclient[5779]: bound to 192.168.25.144 -- renewal in 32701 seconds.
Oct 10 13:24:22 linuxpc NetworkManager[846]: <info> (p14p1): DHCPv4 state changed renew -> renew
Oct 10 13:24:22 linuxpc NetworkManager[846]: <info>   address 192.168.25.144
Oct 10 13:24:22 linuxpc NetworkManager[846]: <info>   prefix 24 (255.255.255.0)
Oct 10 13:24:22 linuxpc NetworkManager[846]: <info>   gateway 192.168.25.1
Oct 10 13:24:22 linuxpc NetworkManager[846]: <info>   hostname 'linuxpc'
Oct 10 13:24:22 linuxpc NetworkManager[846]: <info>   nameserver '192.168.10.1'
Oct 10 13:24:22 linuxpc dbus[910]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Oct 10 13:24:22 linuxpc dbus-daemon[910]: dbus[910]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using     servicehelper)
Oct 10 13:24:22 linuxpc dbus-daemon[910]: dbus[910]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Oct 10 13:24:22 linuxpc dbus[910]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Oct 10 13:30:29 linuxpc dbus-daemon[910]: dbus[910]: [system] Rejected send message, 2 matched rules; type="method_return", sender=":1.2" (uid=0 pid=865 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="(unset)" requested_reply="0" destination=":1.36" (uid=1000 pid=1182 comm="gnome-session ")
Oct 10 13:30:29 linuxpc dbus[910]: [system] Rejected send message, 2 matched rules; type="method_return", sender=":1.2" (uid=0 pid=865 comm="/usr/lib/systemd/systemd-logind ") interface="(unset)" member="(unset)" error name="(unset)" requested_reply="0" destination=":1.36" (uid=1000 pid=1182 comm="gnome-session ")

Best Answer

First 3 lines are messages from dhclient which:

  1. sent a DHCP request to the router
  2. received DHCP lease
  3. set up the interface

next 6 lines are from the NetworkManager, which basically restates the above in more detail reason probably is, that the dhclient instance was spawned by NM (rather silly if you ask me, but that's NetworkManager)

Last 6 lines are from the D-Bus daemon. First 4 of these are the imprint of successful activation of the nm_dispatcher service (nm stands for NetworkManager again) service, which activates services on connection to network.

The 2 remaining lines are (to the best of my understanding) log of rejected message from systemd's logind to the GNOME session manager. I don't speak D-Bus and systemd enough to even guess what could have triggered these, but judging my the man page, I would expect it to be either another login/VT switch or "Device access management for users". It would certainly help if you knew what happened around that time.

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