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trapperjohn
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Joined: 11 Nov 2003
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Location: Bremen/Germany

PostPosted: Sun Feb 01, 2004 7:43 pm    Post subject: Gentoo-style WLAN config Reply with quote

Gentoo-style WLAN config

I created my own little Gentoo-style WLAN script to configure WLAN-settings easily in the same way wired network is configured. In contrast to the script already posted to "Networking & Security" by someone else, it allows configuration of different access points/ESSIDs by creating a config file per access point (so you don't have to touch your /etc/conf.d/net for every AP .. just add a new file to the config directory).

You may have a look at it:
net.eth0 -> /etc/init.d/net.eth0
net -> /etc/conf.d/net
myessid -> /etc/wireless/myessid

Remember: Always backup important config files ...
Replace /etc/init.d/net.eth0 and link to it correctly. The link must be called like your wireless device - if it's eth1 you would link like this:
Code:
ln -sf /etc/init.d/net.eth0 /etc/init.d/net.eth1

Now replace /etc/conf.d/net and edit it. Tell the script, which interface is wireless and set different options (as you can see in the example file above):
Code:
iface_eth1="wlan"
# ... and other options

(BTW: I replaced the default iface_ethX, because I think, the IP/netmask-configuration should be based on the access point, you want to connect to - not based on the device)
Don't forget to re-set your wired network config (cause you replaced the old one ;-) )

Now you can create a file for every access point (if you want to configure just one access point, you can also do this directly in /etc/conf.d/net) named after its ESSID. The default path for these files is /etc/wireless, but you can override this name in /etc/conf.d/net.

At the moment, you can configure just basic options (access-point-scanning on/off, essid, wepkey, nick and dhcp/static ip) but advanced features can simply be added (but I think, most people don't need more).

It worked for me so far, although I've got some problems with my router. Scanning always returns only my neighbours AP until I set the correct ESSID. But this is another story ...

Hope you like this script ... else forget it ;-) I'd like to hear some feedback.
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trapperjohn
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PostPosted: Wed Feb 04, 2004 6:45 am    Post subject: Reply with quote

Any feedback? Is it so bad? :-(
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UberLord
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Joined: 18 Sep 2003
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PostPosted: Wed Feb 11, 2004 2:06 pm    Post subject: Reply with quote

I'm the author of the "other" scripts in the Network forum
https://forums.gentoo.org/viewtopic.php?t=122435

Some comments - although I haven't actually tried your scripts.

How will you handle ESSID's with strange characters like spaces and " and \ and / in them?
Does your iwlist scan command return ESSID's with these characters in?
You don't have a preferred ESSID access list - some people require this.
If you have one ESSID set to DHCP and another to static and flip between the two will DHCP be killed/started correctly?
Will it correctly bring down the interface for PCMCIA users (I'm not sure if this is a problem for your scripts - just something that mine failed to do for a while) when the card is removed?

Saying all that, you have given me one idea for mine - a seperate file for the preferred access list as a tab seperated list which I use at the moment will probably confuse users.
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trapperjohn
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PostPosted: Thu Feb 12, 2004 9:01 pm    Post subject: Reply with quote

UberLord wrote:

How will you handle ESSID's with strange characters like spaces and " and \ and / in them?

Can iwconfig set ESSIDs with special characters? If I call 'iwconfig wlan0 my\ essid', there is no error, but the ESSID is not set ..
Quote:

Does your iwlist scan command return ESSID's with these characters in?

Yes.
Quote:

You don't have a preferred ESSID access list - some people require this.

No, I only have just one fall-back ESSID when no AP is found. This is just because I've never been in the situation to be in reach of two access points which I have both configured. My script just uses ESSID of the first configured AP or the fall-back ESSID.
Quote:

If you have one ESSID set to DHCP and another to static and flip between the two will DHCP be killed/started correctly?

I did not really test this - but as I added the parameter -n, dhcpcd won't fail if it is recalled. It just gets a new lease.
Quote:

Will it correctly bring down the interface for PCMCIA users (I'm not sure if this is a problem for your scripts - just something that mine failed to do for a while) when the card is removed?

Never tried this - I don't own any PCMCIA cards.
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UberLord
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Joined: 18 Sep 2003
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PostPosted: Fri Feb 13, 2004 10:27 am    Post subject: Reply with quote

trapperjohn wrote:

Can iwconfig set ESSIDs with special characters? If I call 'iwconfig wlan0 my\ essid', there is no error, but the ESSID is not set ..


Yes it can

Code:
iwconfig eth1 essid "test\" one"

connects to the essid test" one
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drdebian
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Joined: 07 Apr 2004
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PostPosted: Mon Apr 12, 2004 4:10 am    Post subject: Re: Gentoo-style WLAN config Reply with quote

trapperjohn wrote:
Gentoo-style WLAN config[/size]
Now replace /etc/conf.d/net and edit it. Tell the script, which interface is wireless and set different options (as you can see in the example file above):
Code:
iface_eth1="wlan"
# ... and other options

(BTW: I replaced the default iface_ethX, because I think, the IP/netmask-configuration should be based on the access point, you want to connect to - not based on the device)
Don't forget to re-set your wired network config (cause you replaced the old one ;-) )


Can your script be adapted such that pcmcia cards will get a different name? Not eth?, but wlan? or something like that?

You see I have a number of dynamically assigned interfaces and I need to know which is the wireless one to assign special security (iptables) to it.
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ForestJump
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Joined: 08 Apr 2004
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Location: München

PostPosted: Thu Sep 02, 2004 2:46 pm    Post subject: Reply with quote

nice script ! I'm using it on my laptop.... :wink:
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matthias*
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Joined: 03 Aug 2004
Posts: 144
Location: Paris

PostPosted: Wed Sep 08, 2004 10:39 am    Post subject: Reply with quote

+1

thanks :D
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