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<div class="moz-cite-prefix">On 22/10/13 02.43, Sten Carlsen wrote:<br>
</div>
<blockquote cite="mid:5265CA32.5010503@s-carlsen.dk" type="cite">
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<div class="moz-cite-prefix">On 22/10/13 02.32, Glenn Satchell
wrote:<br>
</div>
<blockquote
cite="mid:0980a14302775d69a9c2a769206c73cf.squirrel@mail.uniq.com.au"
type="cite">
<pre wrap="">Hi Anders
Without the host statement, ie assuming you were using a dynamic address
in both subnets this would be easy. Allow pxeclient class in one pool and
deny it in the other.</pre>
</blockquote>
You would also need to allow/deny known-clients, allow members of
... does not deny known clients.<br>
</blockquote>
I was thinking if there was still a host statement.<br>
<blockquote cite="mid:5265CA32.5010503@s-carlsen.dk" type="cite">
<blockquote
cite="mid:0980a14302775d69a9c2a769206c73cf.squirrel@mail.uniq.com.au"
type="cite">
<pre wrap="">
class "pxeclient" {
match if substring (option vendor-class-identifier, 0, 9) = "PXEClient";
}
shared-network all {
subnet 192.168.254.0 netmask 255.255.255.0 {
pool {
allow members of "pxeclient";
range 192.168.254.100 192.168.254.109;
}
}
subnet 192.168.255.0 netmask 255.255.255.0 {
pool {
deny members of "pxeclient";
range 192.168.255.100 192.168.255.109;
}
}
}
With the host statement, anything in there applies whether we are
pxe-booting or normal booting, so need to be careful how we do things.
That's why you can't put ignore-booting in the host statement as it will
apply in both cases. I'm not entirely sure this will work, but it might
give you an idea.
host boottest {
hardware ethernet 02:13:10:07:11:58;
if substring (option vendor-class-identifier, 0, 9) != "PXEClient" {
fixed-address 192.168.255.12;
}
}
fixed-address has higher preference than dynamic address.
Not sure if you can do this, it's only a siggestion, but maybe just let
clients pxe-boot using their fixed ip-address? Add the details for boot
server and filename to the pxeclient class. It would make the dhcpd.conf
much simpler.
regards,
-glenn
On Tue, October 22, 2013 2:24 am, Sten Carlsen wrote:
</pre>
<blockquote type="cite">
<pre wrap="">My take on this would be to test this:
class "pxeclient" {
match if substring (option vendor-class-identifier, 0, 9) =
"PXEClient";
}
host boottest {
hardware ethernet 02:13:10:07:11:58;
fixed-address 192.168.255.12;
}
shared-network all{
subnet 192.168.254.0 netmask 255.255.255.0 {
pool {
allow members of "pxeclient";
range 192.168.254.100 192.168.254.109;
}
}
subnet 192.168.255.0 netmask 255.255.255.0 {
deny members of "pxeclient"; }
}
The uncertain point here is that in a shared network there is really
nothing to tell which subnet the host belongs to, no DHCP-Relays etc.
This should work if a class has higher preference than a host statement.
I don't know the answer to that, I would have to test it.
On 21/10/13 17.06, Anders Blomdell wrote:
</pre>
<blockquote type="cite">
<pre wrap="">I would like the ISC dhcpd server to hand out either a dynamic ip
address or
a fixed address based on the vendor-class-identifier (I want a dynamic
address
from one subnet during pxeboots and a [possibly] fixed address from
another
subnet otherwise). I have been able to do it by running two instances
of the
dhcp server on the interface, but not by using shared-network.
The working configuration consists of /tmp/254.conf:
class "pxeclient" {
match if substring (option vendor-class-identifier, 0, 9) =
"PXEClient";
}
subnet 192.168.254.0 netmask 255.255.255.0 {
pool {
allow members of "pxeclient";
range 192.168.254.100 192.168.254.109;
}
}
and /tmp/255.conf:
host boottest {
hardware ethernet 02:13:10:07:11:58;
fixed-address 192.168.255.12;
if substring(option vendor-class-identifier, 0, 9) = "PXEClient" {
ignore booting;
}
}
subnet 192.168.255.0 netmask 255.255.255.0 {
}
when running both of them with:
/usr/sbin/dhcpd -d -cf /tmp/254.conf -lf /tmp/254.lease --no-pid
/usr/sbin/dhcpd -d -cf /tmp/255.conf -lf /tmp/255.lease --no-pid
I get the following expected result:
# PXE-booting
DHCPDISCOVER from 02:13:10:07:11:58 via eth0
DHCPOFFER on 192.168.254.100 to 02:13:10:07:11:58 via eth0
# Ordinary boot
DHCPDISCOVER from 02:13:10:07:11:58 via eth0
DHCPOFFER on 192.168.255.12 to 02:13:10:07:11:58 via eth0
But I'm not able to achieve it with just one instance of dhcpd,
the reason seems to be that the 'ignore booting' will be active
for both subnets when the machine is PXE-booting and hence it will
not get an address from the pool.
Anybody that has a good idea on how to solve this?
Regards
Anders
</pre>
</blockquote>
<pre wrap="">--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
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<pre wrap="">
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<pre class="moz-signature" cols="72">--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
</pre>
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<br>
<pre class="moz-signature" cols="72">--
Best regards
Sten Carlsen
No improvements come from shouting:
"MALE BOVINE MANURE!!!"
</pre>
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