[plug] re: log message

[MMT]

Can anyone tell me why there are so many open and close session going on
here, this is a small sample:
Jul  2 17:05:00 gateway PAM_pwdb[25535]: (su) session closed for user tour
Jul  2 17:10:00 gateway PAM_pwdb[25553]: (su) session opened for user tour
by (uid=0)
Jul  2 17:10:00 gateway PAM_pwdb[25553]: (su) session closed for user tour
Jul  2 17:15:00 gateway PAM_pwdb[25571]: (su) session opened for user tour
by (uid=0)
Jul  2 17:15:00 gateway PAM_pwdb[25571]: (su) session closed for user tour
Jul  2 17:17:37 gateway kernel: Packet log: output REJECT ppp0 PROTO=17
203.59.131.109:61378 10.0.0.2:138 L=120 S=0x00 I=4590
5 F=0x0000 T=127 (#6)
Jul  2 17:20:00 gateway PAM_pwdb[25593]: (su) session opened for user tour
by (uid=0)
Jul  2 17:20:00 gateway PAM_pwdb[25593]: (su) session closed for user tour
Jul  2 17:20:01 gateway named[410]: Cleaned cache of 1 RRset
Jul  2 17:20:01 gateway named[410]: USAGE 962529601 961204798
CPU=0.17u/0.13s CHILDCPU=0u/0s
Jul  2 17:20:01 gateway named[410]: NSTATS 962529601 961204798 A=3223
PTR=7329 ANY=1
Jul  2 17:20:01 gateway named[410]: XSTATS 962529601 961204798 RR=2168
RNXD=379 RFwdR=1633 RDupR=136 RFail=14 RFErr=0 RErr=0
RAXFR=0 RLame=0 ROpts=0 SSysQ=189 SAns=8552 SFwdQ=1802 SDupQ=462 SErr=2
RQ=10553 RIQ=0 RFwdQ=0 RDupQ=392 RTCP=0 SFwdR=1633 SF
ail=0 SFErr=0 SNaAns=8552 SNXD=7784

also is there any info around where I can obtain information on what info
one can obtain from the log files.

Thanks