ppp filling /var

[James]

After ppp runs for a few days:

# df
Filesystem    Size   Used  Avail Capacity  Mounted on
/dev/ad0s1a   126M    49M    67M    42%    /
/dev/ad0s1f   252M    18K   232M     0%    /tmp
/dev/ad0s1g   8.1G   1.1G   6.4G    15%    /usr
/dev/ad0s1e   252M   252M -20.0M   109%    /var <----!!!
procfs        4.0K   4.0K     0B   100%    /proc

# du -h /var
... snip ...
12M    /var

After killing ppp:

# df
Filesystem    Size   Used  Avail Capacity  Mounted on
/dev/ad0s1a   126M    49M    67M    42%    /
/dev/ad0s1f   252M    18K   232M     0%    /tmp
/dev/ad0s1g   8.1G   1.1G   6.4G    15%    /usr
/dev/ad0s1e   252M    12M   219M     6%    /var <----
procfs        4.0K   4.0K     0B   100%    /proc

# du -h /var
... snip ...
12M    /var

Anyone know how to fix this? Google was no help.

note: this is not a problem with /var/log/* filling up, as du will show, or 
any file written to disk... its *something* else

Full output of du -h
# du -h /var
2.0K    /var/account
2.0K    /var/at/jobs
2.0K    /var/at/spool
6.0K    /var/at
10.0K   /var/backups
4.0K    /var/crash
2.0K    /var/cron/tabs
4.0K    /var/cron
2.0K    /var/db/ipf
 ... snip ...  (/var/db/pkg/*)
2.2M    /var/db/pkg
4.0K    /var/db/ports/gettext
6.0K    /var/db/ports
 28K    /var/db/portaudit
474K    /var/db/tripwire/report
6.5M    /var/db/tripwire
9.8M    /var/db
2.0K    /var/empty
2.0K    /var/heimdal
1.7M    /var/log
8.0K    /var/mail
4.0K    /var/msgs
2.0K    /var/preserve
2.0K    /var/run/ppp
 94K    /var/run
2.0K    /var/rwho
2.0K    /var/spool/lock
2.0K    /var/spool/lpd
2.0K    /var/spool/mqueue
2.0K    /var/spool/opielocks
2.0K    /var/spool/output/lpd
4.0K    /var/spool/output
2.0K    /var/spool/uucp/.Preserve
2.0K    /var/spool/uucp/.Sequence
2.0K    /var/spool/uucp/.Status
2.0K    /var/spool/uucp/.Temp
2.0K    /var/spool/uucp/.Xqtdir
 12K    /var/spool/uucp
2.0K    /var/spool/uucppublic
4.0K    /var/spool/clientmqueue
 32K    /var/spool
2.0K    /var/tmp/vi.recover
112K    /var/tmp/etc/defaults
2.0K    /var/tmp/etc/X11
4.0K    /var/tmp/etc/gnats
 52K    /var/tmp/etc/isdn
2.0K    /var/tmp/etc/kerberosIV
294K    /var/tmp/etc/mail
 56K    /var/tmp/etc/mtree
 16K    /var/tmp/etc/namedb
 50K    /var/tmp/etc/periodic/daily
6.0K    /var/tmp/etc/periodic/monthly
 42K    /var/tmp/etc/periodic/security
 18K    /var/tmp/etc/periodic/weekly
118K    /var/tmp/etc/periodic
4.0K    /var/tmp/etc/ppp
2.0K    /var/tmp/etc/skel
108K    /var/tmp/etc/ssh
10.0K   /var/tmp/etc/ssl
 22K    /var/tmp/etc/uucp
1.3M    /var/tmp/etc
1.3M    /var/tmp
 22K    /var/yp
2.0K    /var/games/hackdir/save
4.0K    /var/games/hackdir
2.0K    /var/games/larn
2.0K    /var/games/phantasia
10.0K   /var/games
 13M    /var