Provided by: ifupdown2_1.0~git20170314-1_all bug


       ifup - network interface management commands


          ifup - bring a network interface up

          ifdown - take a network interface down


          ifup [-h] [-a] [-v] [-d] [--allow CLASS] [--with-depends]
                 [-X  EXCLUDEPATS]  [-f]  [-n] [-s] [--print-dependency {list,dot}] [IFACE [IFACE

          ifdown [-h] [-a] [-v] [-d] [--allow CLASS] [--with-depends]
                 [-X EXCLUDEPATS] [-f] [-n] [--print-dependency {list,dot}] [IFACE [IFACE ...]]


          ifup and ifdown commands can be  used  to  configure  (or,  respectively,  deconfigure)
          network  interfaces  based  on  interface definitions in the config file ifupdown2.conf
          (defaults to /etc/network/interfaces/ file).

          ifquery(8) maybe used in conjunction  with  ifup  and  ifdown  commands  to  query  and
          validate applied/running configuration.

          ifup  always works on the current interfaces(5) file defined in ifupdown2.conf (default
          /etc/network/interfaces). ifdown works on the last applied interface configuration.

          ifup on an already ifup'ed interface will re-apply the configuration, skipping  already
          applied  configuration  wherever  possible.  In  many  cases  where config commands are
          idempotent, you will see that ifup/ifdown will reapply the config even if the interface
          already has that config.

          ifup and ifdown understands interface dependency order.

          For  logical  interfaces  like  vlans,  bridges,  bonds, ifup creates the interface and
          ifdown  deletes  the  interface.  Use  --admin-state  option  if  you  only   want   to
          administratively bring the interface up/down.

          When  ifup  and  ifdown  are  used with interfaces on command line, they must be have a
          iface section in the interfaces(5) file.


          positional arguments:

          IFACE  interface list separated by spaces. IFACE list and '-a'  argument  are  mutually

          optional arguments:

          -h, --help
                 show this help message and exit

          -a, --all
                 process all interfaces marked "auto"

          -v, --verbose

          -d, --debug
                 output debug info

          --allow CLASS
                 ignore non-"allow-CLASS" interfaces

          -w, --with-depends
                 run  with  all  dependent  interfaces.  This  option  is  redundant  when  -a is
                 specified. When '-a' is specified, interfaces are always executed in  dependency

          -X EXCLUDEPATS, --exclude EXCLUDEPATS
                 Exclude  interfaces  from the list of interfaces to operate on. Can be specified
                 multiple times If the excluded  interface  has  dependent  interfaces,  (e.g.  a
                 bridge  or  a  bond  with  multiple  enslaved  interfaces)  then  each dependent
                 interface must be specified in order to be excluded.

          -i INTERFACESFILE, --interfaces INTERFACESFILE
                 Uses interfaces file instead  of  default  defined  in  ifupdown2.conf  (default
                 /etc/network/interfaces).   Also  in  ifupdown2.conf,  users  are not allowed to
                 specify their own interfaces file unless disable_cli_interfacesfile is set to  0
                 (default is 1).

          -t {native,json}, --interfaces-format {native,json}
                 interfaces file format

          -f, --force
                 force run all operations

          -n, --no-act
                 print out what would happen, but don't do it

          -p, --print-dependency {list,dot}
                 print iface dependency in list or dot format

          -m, --admin-state, --no-scripts
                 don't  run  any addon modules/scripts. Only bring the interface administratively

          -u, --use-current-config
                 By default ifdown looks at the saved state for interfaces to  bring  down.  This
                 option  allows  ifdown  to look at the current interfaces file. Useful when your
                 state file is corrupted or you want down to use the latest from  the  interfaces

          -s, --syntax-check
                 Only run the interfaces file parser


          # bringing up all interfaces
              ifup -a

          # bringing up interface list
              ifup swp1 swp2

          # bringing up interface with its dependents
              ifup br0 --with-depends

          # bringing down all interfaces
              ifdown -a

          # bringing down a single interface
              ifdown swp1

          # excluding interfaces using -X option
              ifdown -X eth0 -a

              ifup -X eth0 -a

              ifdown -X eth0 -X lo -a

          # using verbose -v option to see what is going on
              ifup -v -a

          # using debug -d option to see more of what is going on
              ifup -d -a

          # ignore errors
              ifup -a -f

              ifdown -a -f

          # run ifdown and ifup on all interfaces using service command/init script
              service networking restart

          # run ifup on all interfaces using service command/init script
              service networking start

          # ifdown on all interfaces using service command/init script
              service networking stop

          # To run ifup/ifdown on only interfaces that changed see ifreload(8)


          ifquery(8), ifreload(8), interfaces(5), ifupdown-addons-interfaces(5)


       Roopa Prabhu <>


       Copyright 2014 Cumulus Networks, Inc.  All rights reserved.