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Today's Topics:
1. Re: DHCP option host-name matching (Glenn Satchell)
2. Re: DHCPD is not re-using addresses (Bob Proulx)
----------------------------------------------------------------------
Message: 1
Date: Mon, 14 Mar 2016 13:24:35 +1100
From: "Glenn Satchell" <[email protected]>
To: "Users of ISC DHCP" <[email protected]>
Subject: Re: DHCP option host-name matching
Message-ID:
<[email protected]>
Content-Type: text/plain;charset=iso-8859-1
Regex matching has been a part of the syntax for many years. See dhcp-eval
man page on your system.
data-expression-1 ~= data-expression-2 data-expression-1 ~~
data-expression-2
The ~= and ~~ operators (not available on all systems)
perform extended regex(7) matching of the values of two
data expressions, returning true if data-expression-1
matches against the regular expression evaluated by data-
expression-2, or false if it does not match or encounters
some error. If either the left-hand side or the right-
hand side are null or empty strings, the result is also
false. The ~~ operator differs from the ~= operator in
that it is case-insensitive.
So you'll want something like this, but it's not foolproof either as the
user could name the system anything they like.
class "IPHONE_ACCORDING_TO_HOSTNAME" {
match if option host-name ~= "iPhone";
}
regards,
-glenn
On Sat, March 12, 2016 9:06 am, Bradford Dickerson wrote:
> Thanks Jose for pointer to list. I could use that to identify Apple
> clients. To narrow it down to various apple types such as iphones, ipads
> vs mac computers dont think it will help.
>
>> On Mar 11, 2016, at 4:44 PM, Jos?? Queiroz <[email protected]> wrote:
>>
>> Have you seen this?
>> https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf
>> <https://code.wireshark.org/review/gitweb?p=wireshark.git;a=blob_plain;f=manuf>
>>
>> PS: Sorry the [possible] double posting, for some reason my messages
>> aren't being received by the list.
>>
>> 2016-03-11 18:09 GMT-03:00 Bradford Dickerson <[email protected]
>> <mailto:[email protected]>>:
>> Hi Jose,
>> Thanks for replying. Was looking into that but was unsuccessful (
>> searching on the web ) finding a list(range) of OUIs that Apple used
>> specifically for their iphones. Thx, Brad
>>
>>> On Mar 11, 2016, at 3:43 PM, Jos?? Queiroz <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>> Hi Bradford,
>>>
>>> It will be much easier if you use MAC Addresses to do that. That way
>>> you may use the MAC's OUI to determine the device's branding.
>>>
>>> 2016-03-11 17:35 GMT-03:00 Bradford Dickerson <[email protected]
>>> <mailto:[email protected]>>:
>>> Hi,
>>> At our company, we are trying to hand out IP ranges based on the
>>> characteristics of the client. For example using a class declaration
>>> as follows:
>>>
>>> class "IPHONE_ACCORDING_TO_HOSTNAME" {
>>> match if substring(option host-name,0,6) = "iPhone";
>>> }
>>>
>>> but I notice many iphones have names like ???Brad-iPhone??? or
>>> ???TomIphone??? does not quite match above . Is there any plan to
>>> support regex type matches?
>>>
>>> Thx,
>>> Brad
>>> _______________________________________________
>>> dhcp-users mailing list
>>> [email protected] <mailto:[email protected]>
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>> <https://lists.isc.org/mailman/listinfo/dhcp-users>
>>
>>
>
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------------------------------
Message: 2
Date: Mon, 14 Mar 2016 01:02:47 -0600
From: Bob Proulx <[email protected]>
To: [email protected]
Subject: Re: DHCPD is not re-using addresses
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
CLOSE Dave wrote:
> When I run PXE on a new machine, I see the Anaconda (the Fedora
> installer) makes at least three requests for a dynamic address. So far
> as I can tell, all of the requests are identical.
>...
> Even though all the requests originate from the same MAC address, the
> DHCP server gives each request a unique response. As the address leases
> take time to expire, I quickly run out of available addresses. Much more
> quickly than I should.
As Steinar Haug mentioned it is likely that the different clients are
submitting different client ids. In which case DHCP requires
responding with a different address.
Have you considered using shorter lease times for your volatile
clients? That way they will expire in a shorter time period and be
available to be reused. There are likely much better ways to
accomplish this but this is what I do. It prevents running out of
addresses from the pool when consuming them quickly. Here I have a
small pool sufficient for me but you might need to decrease times and
a larger pool. But hopefully it gives you the idea.
class "volatile" {
match if substring(option vendor-class-identifier, 0, 3) = "d-i" or
substring(option vendor-class-identifier, 0, 9) = "PXEClient" or
substring(option vendor-class-identifier, 0, 9) = "Etherboot" or
substring(option vendor-class-identifier, 0, 8) = "anaconda" or
substring(option vendor-class-identifier, 0, 8) = "volatile";
}
subnet 192.168.42.0 netmask 255.255.255.0 {
option subnet-mask 255.255.255.0;
option routers 192.168.42.1;
pool {
failover peer "dhcp-failover-peers";
range 192.168.42.200 192.168.42.240;
deny members of "volatile";
default-lease-time 43200;
max-lease-time 86400;
}
pool {
failover peer "dhcp-failover-peers";
range 192.168.42.50 192.168.42.99;
allow members of "volatile";
default-lease-time 1800;
max-lease-time 1800;
}
}
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