| View previous topic :: View next topic |
| Author |
Message |
paleck
n00b
Joined: 03 Jul 2002
Posts: 37
Location: The US
|
 Posted: Sun Jul 14, 2002 7:01 am Post subject: Automatic Network Switching? |
 |
|
| At work I use my laptop's built in ethernet port to connect to the network and at home I use a Lucent Orinoco Card to connect to the network/internet. Is there any way to automate switching between the two networks. For instance if cardmgr is unable to load any cards it automatically switches the network to the eth0(built-in ethernet) card. Otherwise other programs/daemons will start up even when I am not connected to my default interface. |
|
| Back to top |
|
 |
ElCondor
Guru
Joined: 10 Apr 2002
Posts: 520
Location: Vienna, Austria, Europe
|
| Posted: Sun Jul 14, 2002 9:40 am Post subject: |
|
|
Typically internal network is eth0 and wavelan eth1, so you can make your scripts checkout which interface is up and running and set special actions by the results.
concerning the other daemons/programs like apache, postgres, vmware, samba, ... that only come up when they find a network, you simply have to remove the depencies from the init-scripts, most look like | Code: | depend() {
need net
} |
* ElCondor pasa *
_________________
Here I am the victim of my own choices and I'm just starting! |
|
| Back to top |
|
|
swingarm
l33t
Joined: 08 Jun 2002
Posts: 627
Location: Northern Colorado
|
|
| Back to top |
|
|
dc
n00b
Joined: 29 Jul 2002
Posts: 7
Location: Hildesheim (Germany)
|
| Posted: Mon Jul 29, 2002 4:01 pm Post subject: |
|
|
A really cool solution for automatic network configuration switching is Felix von Leitner's "divine" ( http://www.fefe.de/divine/ ).
_________________
Viel Spass am Geraet!
Dennis |
|
| Back to top |
|
|
jessler
Tux's lil' helper
Joined: 17 Jul 2002
Posts: 78
Location: 127.0.0.1
|
| Posted: Mon Jul 29, 2002 4:59 pm Post subject: |
|
|
Try quickswitch
emerge quickswitch |
|
| Back to top |
|
|
bangslash
n00b
Joined: 14 Aug 2002
Posts: 1
|
| Posted: Wed Aug 14, 2002 10:08 am Post subject: |
|
|
Anyone actually get divine working on their Gentoo setup? Also, I set up my machine according to the Gentoo Security FAQ. Is there anything in there that would prevent divine from working properly? Thanks!
!/ |
|
| Back to top |
|
|
xterminus
n00b
Joined: 03 Sep 2002
Posts: 15
Location: Tacoma, WA
|
| Posted: Mon Dec 02, 2002 3:11 am Post subject: |
|
|
When I first setup gentoo, I copied and modified the columbus boot script for gentoo. It's been adapted to gentoo's runlevel scheme, and kicks off required services depending upon the network detected by arping. Works similarly to how divine works, but gentoo native (yay!)
You'll need to emerge arping btw.
Here's the script and the various files you'll need to create. Feel free to clean it up - it's still sort of messy; but it works.
/etc/columbus/networks
Each field is tab seperated, first two fields indicate what your looking for (a mac address to arp, and the resulting IP), and then if true; the network "name" your going to use to assign to the network for further processing.
| Code: |
00:a0:4b:07:4d:06 10.0.0.1 mauchnet
00:e0:a3:13:a0:1c 168.xxx.xxx.1 ibi
|
/etc/columbus/run.mauchnet
Just kicks off the services needed when I'm at home.
| Code: |
#!/bin/sh
/etc/init.d/samba start
/etc/init.d/netmount start
|
Kicks off the specific services I need when I'm at school, especially important are the firewalling features and bringing up my ipsec tunnel. I also have to drop the extra route provided by my college's network or else ipsec blows up.
/etc/columbus/run.ibi
| Code: |
#!/bin/sh
/sbin/route del default gw 168.xxx.xxx.1
/etc/init.d/firewall start
/etc/init.d/ipsec start
|
/etc/columbus/mauchnet/etc/issue
This is what I *love* about columbus. Create a directory structure in the columbus directory, and any files found within that symbolicly linked to the "real" name when this is run. So when When I'm home, my /etc/issue is linked to /etc/columbus/mauchnet/issue. You can get really imaginative here. I also link my samba configuration files differently, so I participate on my college's network completely differently from how I participate on my lan at home for example. Go nuts.
| Code: |
Welcome to MauchNet
|
/etc/columbus/ibi/etc/issue
| Code: |
Welcome to the xxxx xxxxx xxxx College Network
|
/etc/init.d/columbus
Here's the columbus script. It's kind of messy, but it works well and does all the pretty [ok] boxes on boot. After you've put this into your /etc/init.d/ directory, you'll want to do an rc-update add columbus (whatever runlevel you want). You'll also want to check the perms on the shell scripts in /etc/columbus so that they're executable.
Enjoy. If you get stuck fire me an email; I don't check the forums much anymore.
| Code: |
#!/sbin/runscript
#
# columbus 0.0.2
# (C) thomas@apestaart.org
# GPL
# gentoo version created and tweaked by Charles Mauch <cmauch@myrealbox.com>
# automatically guess what network we're on
# and perform network-specific stuff
# using an arp broadcast ping
# use /etc/columbus/networks as the file to use in pinging stuff
# format of that files is
# MAC\tIP\tnetwork
# where MAC is a six-byte address separated by :'s
# IP is the ip address on that network of that host's MAC address
# network is the user-friendly name of the network
# log to syslog
# in /etc/columbus, scripts named pre.[net] are executed before symlinks
# then, each file in the tree /etc/columbus/[net]/ is ln -sf'd to /
# then, the script post.[net] is executed
depend() {
need net
}
VERSION=0.0.2
IFCONFIG=/sbin/ifconfig
COLUMBUS=/etc/columbus
NETWORKS=$COLUMBUS/networks
ARPING="/usr/sbin/arping -c 1"
RESTART_NET="/etc/rc.d/init.d/network restart"
debug()
{
if test ! -z $DEBUG; then
echo "$@"
fi
}
arp_scan()
# scans the network based on information in $NETWORKS
# puts the probed net name in $NET_FOUND
{
for a in `cat $NETWORKS | tr "\t" ","`; do
MAC=`echo $a | cut -d, -f1`
IP=`echo $a | cut -d, -f2`
NET=`echo $a | cut -d, -f3`
# Get the second line of the arping result
debug "arpinging $IP for MAC address $MAC ..."
RESULT=`$ARPING $IP | head -n 2 | tail -n 1`
MAC_FOUND=`echo $RESULT | cut -d " " -f4`
if test "$MAC" = "$MAC_FOUND"; then
debug "Network $NET found."
NET_FOUND=$NET
return 1
fi
done
# return failure
eend $? "Could not determine net !"
return 0
}
check_sync()
{
debug "Checking if network is in sync ..."
arp_scan
if test ! $?; then
# could not get what net we're in
echo "could not get net"
return 0
fi
NET_CURRENT=`cat $COLUMBUS/current`
if test "$NET_CURRENT" != "$NET_FOUND"; then
debug "Network not in sync."
return 0
else
debug "Network in sync."
return 1
fi
}
set_net()
{
NET=$@
# apply configuration
cd $COLUMBUS
# now apply system configuration
if test -d "$NET"; then
ebegin " Creating symlinks from /etc/columbus/$NET to root"
cd $NET
find * -type f -exec ln -sf $COLUMBUS/$NET/{} /{} \;
eend $?
fi
cd ..
# save new last set network
echo $NET > $COLUMBUS/current
# Execute a gentoo virtual runlevel
if test -e "/etc/columbus/run.$NET"; then
ebegin " Firing up scripts needed for the \"$NET\" network"
exec /etc/columbus/run.$NET
eend $?
fi
}
parse_options()
{
HELP="\
columbus $VERSION, (c) thomas@apestaart.org\n\n\
-a always sets new network\n\
-c clear your IP address before starting scan\n\
-d dev use this device\n\
-h help\n\
-l log to syslog\n\
-n net forcefully set this net\n\
-s check if the current settings match the current network\n\
and forcefully sync if they don't\n\
-v verbose"
# Note that we use `"$@"' to let each command-line parameter expand to a \
# separate word. The quotes around `$@' are essential!
# We need TEMP as the `eval set --' would nuke the return value of getopt.
TEMP=`getopt -o acd:hln:sv -- "$@"`
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi
# defaults
IFDEV=eth0
LOGGER="echo"
eval set -- "$TEMP"
while true ; do
case "$1" in
-a) APPLY="yes" ; shift ;;
-c) CLEAR="yes" ; shift ;;
-d) IFDEV="$2" ; shift 2 ;;
-h) echo -e "$HELP" ; exit ;;
-l) LOGGER="logger -t columbus -s" ; shift ;;
-n) NET="$2" ; shift 2;;
-s) SYNC="yes"; shift ;;
-v) DEBUG="yes"; shift ;;
--) shift ; break ;;
*) echo "List options here!" ; exit 1 ;;
esac
done
}
# start of main
start() {
ebegin "Checking Network Connections"
parse_options $@
# if we've been asked to forcefully set a network, then do that
if test ! -z "$NET"; then
ewend 1 " Forcing network $NET"
set_net $NET
exit
fi
# if we're asked to clear the ip address then do that
if test ! -z "$CLEAR"; then
$IFCONFIG $IFDEV 0.0.0.0
fi
# if we're asked to bring it in sync, then do that
if test ! -z "$SYNC"; then
check_sync
if test $? -eq 0; then
# set the net to what has been found
ewend 1 " Resyncing net to $NET_FOUND"
set_net $NET_FOUND
$RESTART_NET
fi
exit
fi
# scan the network
arp_scan
# did we find it ?
if test -z "$NET_FOUND"; then
ewend 1 " No network autodetected!"
exit
fi
eend $? " Devices on the \"$NET_FOUND\" network found!"
# change it if allowed
if test ! -z "$APPLY"; then
set_net $NET_FOUND
fi
NET_CURRENT=`cat $COLUMBUS/current`
if test "$NET_CURRENT" != "$NET_FOUND"; then
ewend 2 " Last set network $NET_CURRENT not in sync with current $NET_FOUND !"
fi
}
|
Take it easy |
|
| Back to top |
|
|
pilla
Bodhisattva
Joined: 07 Aug 2002
Posts: 7729
Location: Underworld
|
| Posted: Mon Dec 02, 2002 4:47 am Post subject: |
|
|
I didn't like it very much the two times I tried it.
It makes some changes in some /etc files that I didn't like that much...
| jessler wrote: | Try quickswitch
emerge quickswitch |
|
|
| Back to top |
|
|
int1
Tux's lil' helper
Joined: 08 Nov 2002
Posts: 139
|
|
| Back to top |
|
|
|
Kernel & Hardware
