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Today's Topics:
1. Re: No Option 43 in DHCP ACK (Jason Bailey)
2. Changing dhclient hardcoded options (Debian) (Nicolas C.)
3. Re: Changing dhclient hardcoded options (Debian) (Alex Bligh)
4. Re: Changing dhclient hardcoded options (Debian) (Nicolas C.)
----------------------------------------------------------------------
Message: 1
Date: Mon, 24 Aug 2015 10:33:51 -0600
From: Jason Bailey <[email protected]>
To: Users of ISC DHCP <[email protected]>
Subject: Re: No Option 43 in DHCP ACK
Message-ID: <[email protected]>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"
So I've managed to make several of the suggested configurations work
with newer versions of the DHCP server (CentOS 7, for example), but I
cannot get it to work with the version we are running (CentOS 6, ISC
DHCP 4.1.1). Any ideas as to why that might be?
Jason
On 08/04/2015 02:45 PM, Jason Bailey wrote:
> Thank you all for the many options. I'm still evaluating the approach
> I'd like to take.
>
> I do have another question, however. Is it possible to match class
> based on option 43 data found in the client's DHCP request? Could I do
> a substring match of sorts against that data?
>
> Best,
>
> Jason
>
> On 08/01/2015 07:36 PM, Frank Bulk wrote:
>> Jason,
>>
>> I do it within the subnet (we're also a Calix shop) and it seems to work
>> fine.
>>
>> Frank
>>
>> -----Original Message-----
>> From:[email protected]
>> [mailto:[email protected]] On Behalf Of Peter Rathlev
>> Sent: Saturday, July 18, 2015 8:38 AM
>> To: Users of ISC DHCP<[email protected]>
>> Subject: Re: No Option 43 in DHCP ACK
>>
>> On Wed, 2015-07-15 at 10:55 -0600, Jason Bailey wrote:
>>> Calix ONTs, actually. I'm trying to get only certain ONTs to pick up
>>> certain option 43 configuration directives.
>>>
>>> Their documentation says:
>>>
>>> Configure the default global DHCP options at the DHCP server as
>>> follows:
>>> option space CALIX-ONT-SERVER;
>>> option CALIX-ONT-SERVER.cms-address code 1 = ip-address;
>>> option CALIX-ONT-SERVER.second-tftp-address code 2 = ip-address;
>>> option CALIX-ONT-SERVER.syslog-address code 4 = ip-address;
>>> option CALIX-ONT-SERVER.firmware1 code 101 = text;
>>> option CALIX-ONT-SERVER.firmware2 code 102 = text;
>>> option CALIX-ONT-SERVER.firmware3 code 103 = text;
>>>
>>> Configure specific values for DHCP options within a subnet
>>> declaration, as shown in the following example:
>>>
>>> # AE-ONT Management Network
>>> subnet xxx.xxx.xxx.x netmask xxx.xxx.xxx.x{
>>> vendor-option-space CALIX-ONT-SERVER;
>>> option CALIX-ONT-SERVER.cms-address xxx.xxx.xxx.xxx;
>>> option CALIX-ONT-SERVER.syslog-address xxx.xxx.xxx.xxx;
>>> option CALIX-ONT-SERVER.firmware1 "blah";
>>>
>>> The problem is, that doesn't work (I couldn't get to work, anyhow). If
>>> you use class matching, the DHCP server will send option 43
>>> information, but unfortunately (as far as I see it, anyway), only if
>>> those classes are declared globally.
>> Classes are always global. It's an error to place the class declaration
>> inside e.g. a subnet declaration.
>>
>>> The problem with that is that the matching ends up being all
>>> encompassing and ONTs end up getting options that they shouldn't. In
>>> short, it creates severe issues on the network.
>> Could you maybe use something like this:
>>
>> option X-CALIX-Selector code 247 = string;
>> subnet 192.0.2.0 netmask 255.255.255.128 {
>> option X-CALIX-Selector "asdf";
>> }
>> subnet 192.0.2.128 netmask 255.255.255.128 {
>> # No CALIX option
>> }
>> subnet 203.0.113.0 netmask 255.255.255.0 {
>> option X-CALIX-Selector "something-else";
>> }
>> class "CALIX-ONT" {
>> match if substring(option vendor-class-identifier, 0, 9) = "Calix
>> ONT";
>> vendor-option-space CALIX-ONT-SERVER;
>> if (config-option X-CALIX-Selector = "asdf") {
>> option CALIX-ONT-SERVER.cms-address xxx.xxx.xxx.xxx;
>> option CALIX-ONT-SERVER.syslog-address xxx.xxx.xxx.xxx;
>> option CALIX-ONT-SERVER.firmware1 "blah";
>> } elsif (config-option X-CALIX-Selector = "something-else") {
>> option CALIX-ONT-SERVER.cms-address yy.yy.yy.yy;
>> option CALIX-ONT-SERVER.syslog-address yy.yy.yy.yy;
>> option CALIX-ONT-SERVER.firmware1 "another-blah";
>> }
>> }
>>
>> Blocks without an X-CALIX-Selector config-option shouldn't hand you any
>> of the options.
>>
>
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------------------------------
Message: 2
Date: Mon, 24 Aug 2015 23:11:06 +0200
From: "Nicolas C." <[email protected]>
To: Users of ISC DHCP <[email protected]>
Subject: Changing dhclient hardcoded options (Debian)
Message-ID: <[email protected]>
Content-Type: text/plain; charset=utf-8; format=flowed
Hello,
It seems that the package "ifupdown" on Debian provides hardcoded
options for dhclient :
http://stackoverflow.com/questions/14720571/which-program-invokes-dhclient-on-debian-squeeze
I'd like to run dhclient with the "-i" option, is there an easy way (no
recompiling / packaging) to do this?
Thanks,
------------------------------
Message: 3
Date: Tue, 25 Aug 2015 00:02:56 +0100
From: Alex Bligh <[email protected]>
To: Users of ISC DHCP <[email protected]>
Subject: Re: Changing dhclient hardcoded options (Debian)
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
On 24 Aug 2015, at 22:11, Nicolas C. <[email protected]> wrote:
> It seems that the package "ifupdown" on Debian provides hardcoded options for
> dhclient :
>
> http://stackoverflow.com/questions/14720571/which-program-invokes-dhclient-on-debian-squeeze
>
> I'd like to run dhclient with the "-i" option, is there an easy way (no
> recompiling / packaging) to do this?
Something like this (untested)
mv /sbin/dhclient /sbin/dhclient.orig
cat > /sbin/dhclient
#!/bin/bash
exec /sbin/dhclient.orig -i "$@"
^D
chmod 755 /sbin/dhclient
--
Alex Bligh
------------------------------
Message: 4
Date: Tue, 25 Aug 2015 08:34:21 +0200
From: "Nicolas C." <[email protected]>
To: Users of ISC DHCP <[email protected]>
Subject: Re: Changing dhclient hardcoded options (Debian)
Message-ID: <[email protected]>
Content-Type: text/plain; charset=windows-1252; format=flowed
On 25/08/2015 01:02, Alex Bligh wrote:
>
> On 24 Aug 2015, at 22:11, Nicolas C. <[email protected]> wrote:
>
>> It seems that the package "ifupdown" on Debian provides hardcoded options
>> for dhclient :
>>
>> http://stackoverflow.com/questions/14720571/which-program-invokes-dhclient-on-debian-squeeze
>>
>> I'd like to run dhclient with the "-i" option, is there an easy way (no
>> recompiling / packaging) to do this?
>
> Something like this (untested)
>
> mv /sbin/dhclient /sbin/dhclient.orig
>
> cat > /sbin/dhclient
> #!/bin/bash
> exec /sbin/dhclient.orig -i "$@"
> ^D
>
> chmod 755 /sbin/dhclient
Of course! And I can use "dpkg-divert" to keep this script even if
the package "isc-dhcp-client" is updated.
Thanks!
------------------------------
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