config is in ipvsadm 1:1.25.clean-1ubuntu5.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53  | #!/bin/sh
set -e
. /usr/share/debconf/confmodule || exit 0
IPVSADM_CONFIG="/etc/default/ipvsadm"
db_version 2.0
if [ -f $IPVSADM_CONFIG ]; then
    . $IPVSADM_CONFIG
    [ -n "$AUTO" ] && db_set ipvsadm/auto_load_rules "$AUTO"
    [ -n "$DAEMON" ] && db_set ipvsadm/daemon_method "$DAEMON"
    [ -n "$IFACE" ] && db_set ipvsadm/daemon_multicast_interface "$IFACE"
fi
db_input medium ipvsadm/auto_load_rules || true
db_go
db_capb backup
IFACE_ERR=""
STATE=1
while [ "$STATE" != "0" -a "$STATE" != "3" ]; do
    ERRNO=0
    case "$STATE" in
	1)
	    db_input medium ipvsadm/daemon_method || true
    	    db_go || ERRNO=$?
	    ;;
	2)
	    db_get ipvsadm/daemon_method
	    if [ "$RET" != "none" ]; then
		db_input low ipvsadm/daemon_multicast_interface || true
		db_go || ERRNO=$?
		if [ "$ERRNO" != "0" ]; then
		    db_subst ipvsadm/daemon_multicast_interface \
			interface_error ""
		fi
	    fi
	    ;;
    esac
    if [ "$ERRNO" = "0" ]; then
	STATE=$(($STATE + 1))
    else
	STATE=$(($STATE - 1))
    fi
done
db_subst ipvsadm/daemon_multicast_interface interface_error ""
 |