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Thank for the quick response...<BR>
<BR>
You are correct, I meant "Fixed address assignments"... That is what I get from hanging around windows people. <BR>
<BR>
<BR>
Please see my comments/questions below.<BR>
On Mon, 2008-08-11 at 13:57 +0100, Simon Hobson wrote:
<BLOCKQUOTE TYPE=CITE>
<PRE>
Luis Fernando Lacayo wrote:
>I have a quick question, I have a bunch of subnets and I have DHCP
>Lease reservations for almost every network.
First off, I assume you mean "fixed address assignments" - lease
reservations are a bit of Windows terminology, different method of
working and plenty of scope for confusion !
> my question is about how to define these reservations. currently
>I have each reservation under its own subnet. I have seen some
>configuration files that just bundles them at the end of the file.
>I imagine that this works.
They MUST NOT be within a subnet declaration. With a few exceptions
for some rather unusual requirements, you REALLY do not want them in
your subnet declarations. Host statements are global in scope (and so
are still 'valid' when the client is not in that subnet - BUT,
clients matching a host statement will inherit some options from the
subnet where the host declaration is made.
</PRE>
</BLOCKQUOTE>
OK, I think I understand. Will this apply to the failover configuration as well? <BR>
<BR>
So this setup would be incorrect:<BR>
<BR>
## Third Floor South Wired<BR>
subnet 10.129.76.0 netmask 255.255.254.0 {<BR>
option routers 10.129.76.1;<BR>
...<BR>
option broadcast-address 10.129.77.255;<BR>
option domain-name-servers 10.129.161.20, 10.128.5.28;<BR>
option subnet-mask 255.255.254.0;<BR>
......<BR>
pool {<BR>
failover peer "co-wan03";<BR>
deny dynamic bootp clients;<BR>
allow unknown-clients;<BR>
range 10.129.76.21 10.129.76.230;<BR>
range 10.129.77.21 10.129.77.230;<BR>
}<BR>
<BR>
## Anthony James<BR>
host Host-10.129.76.225 {<BR>
hardware ethernet 00:0d:56:a0:67:c4;<BR>
fixed-address 10.129.76.225;<BR>
}<BR>
}<BR>
<BR>
## Fourth Floor Wired<BR>
<BR>
subnet 10.129.78.0 netmask 255.255.254.0 {<BR>
option routers 10.129.78.1;<BR>
...<BR>
option broadcast-address 10.129.79.255;<BR>
option domain-name-servers 10.129.161.20, 10.128.5.28;<BR>
option subnet-mask 255.255.254.0;<BR>
....<BR>
pool {<BR>
failover peer "co-wan03";<BR>
deny dynamic bootp clients;<BR>
allow unknown-clients;<BR>
range 10.129.78.21 10.129.78.230;<BR>
range 10.129.79.21 10.129.79.230;<BR>
}<BR>
<BR>
host Host-10.129.78.232 {<BR>
hardware ethernet 00:20:6b:51:db:45;<BR>
fixed-address 10.129.78.232;<BR>
}<BR>
<BR>
<BR>
It should be:<BR>
<BR>
## Third Floor South Wired<BR>
subnet 10.129.76.0 netmask 255.255.254.0 {<BR>
option routers 10.129.76.1;<BR>
...<BR>
option broadcast-address 10.129.77.255;<BR>
option domain-name-servers 10.129.161.20, 10.128.5.28;<BR>
option subnet-mask 255.255.254.0;<BR>
......<BR>
pool {<BR>
failover peer "co-wan03";<BR>
deny dynamic bootp clients;<BR>
allow unknown-clients;<BR>
range 10.129.76.21 10.129.76.230;<BR>
range 10.129.77.21 10.129.77.230;<BR>
}<BR>
<BR>
<BR>
}<BR>
<BR>
## Fourth Floor Wired<BR>
<BR>
subnet 10.129.78.0 netmask 255.255.254.0 {<BR>
option routers 10.129.78.1;<BR>
...<BR>
option broadcast-address 10.129.79.255;<BR>
option domain-name-servers 10.129.161.20, 10.128.5.28;<BR>
option subnet-mask 255.255.254.0;<BR>
....<BR>
pool {<BR>
failover peer "co-wan03";<BR>
deny dynamic bootp clients;<BR>
allow unknown-clients;<BR>
range 10.129.78.21 10.129.78.230;<BR>
range 10.129.79.21 10.129.79.230;<BR>
}<BR>
}<BR>
<BR>
<BR>
## Anthony James<BR>
host Host-10.129.76.225 {<BR>
hardware ethernet 00:0d:56:a0:67:c4;<BR>
fixed-address 10.129.76.225;<BR>
}<BR>
<BR>
## James Brown<BR>
host Host-10.129.78.232 {<BR>
hardware ethernet 00:20:6b:51:db:45;<BR>
fixed-address 10.129.78.232;<BR>
}<BR>
<BR>
<BR>
<BR>
<BR>
<BLOCKQUOTE TYPE=CITE>
<PRE>
In case you haven't worked that out, you can have a client getting a
dynamic IP address in one subnet, while inheriting the (incorrect)
router address from the subnet where it's host statement is declared.
I think anyone can imagine the confusion that could cause !
</PRE>
</BLOCKQUOTE>
<BR>
I have not ran into this issue yet. but it could create
<BLOCKQUOTE TYPE=CITE>
<PRE>
>I am working on a small interface to to manage these because they
>are getting out of control, with staff members moving floors and
>printers being removed or relocated...
>
>How are you defining your reservations? and better yet how are you
>managing them?
Many people store the information in a database (it can be anything
you are comfortable with), and then have a routine that will extract
the data and build a config file. You only need to build parts of a
file - for example you can just build a file with host declarations
and use the 'include" statement to include it in the main config file.
</PRE>
</BLOCKQUOTE>
<BR>
Any special program (Open source) that you recommend?<BR>
<BR>
Thanks again, <BR>
<BR>
Luis<BR>
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--
Luis Fernando Lacayo
Chicago Public Schools
Senior Unix Administrator
ITS/ UNIX Infrastructure
Office: 773-553-3835
Cell: 773-203-4493
</PRE>
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