[PLUG] Computer loud bleep

[John Jason Jordan]

Xubuntu 13.10, up to date. Its IP address is 192.168.0.126, assigned fby
the router on my local network. I am suddenly getting an occasional
bleep from the computer. loud enough to knock me out of my chair. There
is no /var/log/messages file (where did they move it to?), but I find
some interesting stuff in dmesg | tail:

[291279.716054] Peer 207.6.248.201:61806/53253 unexpectedly shrunk
window 3808311779:3808346156 (repaired) [291731.228647] Peer
207.6.248.201:61806/53253 unexpectedly shrunk window
3874789445:3874829614 (repaired) [291731.804445] Peer
207.6.248.201:61806/53253 unexpectedly shrunk window
3874789445:3874829614 (repaired) [291732.960019] Peer
207.6.248.201:61806/53253 unexpectedly shrunk window
3874789445:3874829614 (repaired) [343065.633401] UDP: short packet:
From 60.211.56.207:55212 47302/109 to 192.168.0.126:7881
[389853.837634] UDP: short packet: From 178.90.14.162:54876 713/73 to
192.168.0.126:7881 [396323.049043] type=1400 audit(1390577806.799:57):
apparmor="STATUS" operation="profile_replace" parent=24783
profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=24787
comm="apparmor_parser" [396323.049050] type=1400
audit(1390577806.799:58): apparmor="STATUS" operation="profile_replace"
parent=24783 profile="unconfined" name="/usr/sbin/cupsd" pid=24787
comm="apparmor_parser" [396323.049477] type=1400
audit(1390577806.799:59): apparmor="STATUS" operation="profile_replace"
parent=24783 profile="unconfined" name="/usr/sbin/cupsd" pid=24787
comm="apparmor_parser" [413910.880331] UDP: short packet: From
41.130.77.40:15546 2154/106 to 192.168.0.126:7881

(Sorry about the wraps)

I could use some comments about the above.