Re: where to use the xdm host chooser?

2004-06-05 Thread Rob
Zhang Weiwu wrote:
Hello. Now I have my /usr/X11R6/lib/X11/xdm/Xaccess contain (only) this:
*   CHOOSER BROADCAST
according to xdm(1) this will enable XDMCP host chooser upon user login. 
Now I reboot, xdm login box pops up, everything like it was before.
I think it means any host can connect and asks in a broadcast.
If, on your network, a host does
  X -broadcast
your machine will/may appear in the that machine's chooser list.
I don't know if it also allows an indirect request:
X -indirect your X host
Oh, and take also a note of this in xdm-config file:
! SECURITY: do not listen for XDMCP or Chooser requests
! Comment out this line if you want to manage X terminals with xdm
DisplayManager.requestPort: 0

I thought there will be a bottom to click to launch the chooser (like 
gdm - system - Run XDMCP host chooser), or there will be a list of 
clickable hosts to send query to. Any hints?
I don't know anything about gdm. Never used it.
Rob.
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Re: where to use the xdm host chooser?

2004-06-05 Thread Zhang Weiwu
Rob wrote:
Zhang Weiwu wrote:
Hello. Now I have my /usr/X11R6/lib/X11/xdm/Xaccess contain (only) this:
*   CHOOSER BROADCAST
according to xdm(1) this will enable XDMCP host chooser upon user 
login. Now I reboot, xdm login box pops up, everything like it was 
before.

I think it means any host can connect and asks in a broadcast.
If, on your network, a host does
  X -broadcast
your machine will/may appear in the that machine's chooser list.
I don't really get you, I'm a xdm newbie;)
I am not sure of the inner machenism but in my local network 
(192.168.0.0/24) everyone in the office use gdm and turned on XDMCP, so 
you pick up a box with gdm login screen, select 'run host chooser' from 
'system' menu, you will see all the computers in the office listed there 
and I can pick up one to login. I believe this means they are all 
broadcasting.

I don't know if it also allows an indirect request:
X -indirect your X host
Oh, and take also a note of this in xdm-config file:
! SECURITY: do not listen for XDMCP or Chooser requests
! Comment out this line if you want to manage X terminals with xdm
DisplayManager.requestPort: 0
What does this mean? I am running a slow box I don't need myself to be 
listed in the host chooser of other boxes, but I need to be able to 
login to other boxes.
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Re: where to use the xdm host chooser?

2004-06-05 Thread Rob
Zhang Weiwu wrote:
Rob wrote:
Zhang Weiwu wrote:
Hello. Now I have my /usr/X11R6/lib/X11/xdm/Xaccess contain (only) this:
*   CHOOSER BROADCAST
according to xdm(1) this will enable XDMCP host chooser upon user 
login. Now I reboot, xdm login box pops up, everything like it was 
before.

I think it means any host can connect and asks in a broadcast.
If, on your network, a host does
  X -broadcast
your machine will/may appear in the that machine's chooser list.

I don't really get you, I'm a xdm newbie;)
I am not sure of the inner machenism but in my local network 
(192.168.0.0/24) everyone in the office use gdm and turned on XDMCP, so 
you pick up a box with gdm login screen, select 'run host chooser' from 
'system' menu, you will see all the computers in the office listed there 
and I can pick up one to login. I believe this means they are all 
broadcasting.

I don't know if it also allows an indirect request:
X -indirect your X host
Oh, and take also a note of this in xdm-config file:
! SECURITY: do not listen for XDMCP or Chooser requests
! Comment out this line if you want to manage X terminals with xdm
DisplayManager.requestPort: 0

What does this mean? I am running a slow box I don't need myself to be 
listed in the host chooser of other boxes, but I need to be able to 
login to other boxes.
I'm not an expert either, but I have some memories when I was fiddling
with X and xdm configuration. So take my advice was a pinch of salt.
The files /usr/X11R6/lib/X11/xdm/Xaccess and /usr/X11R6/lib/X11/xdm/xdm-config
are only for regulating access from other hosts to your PC. Apparently that's
not what you're interested in. For security reasons, it's then better to block
that access, since X is a rather insecure protocol.
So, if other computers are configured such that they answer broadcast requests,
or direct access request, you can simply type that from your PC.
You requesting a broadcast, should be something like:
X -broadcast
If you want to get a chooser from a specific host, then type:
X -indirect host
If you want to get directly to xdm on a specific host, then do:
X -query host
At least that's what I remember. Do X -help for all flags, such
as forcing a display 3 and/or virtual terminal 9 (X :3 vt9).
However, once again, I may be wrong here in the details. Hopefully a more
knowledgeable person will give comments too.
Regards,
Rob.
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