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Today's Topics:
1. Sending dynamic boot filename to clients (Dave M)
2. Re: Sending dynamic boot filename to clients (Darren Ankney)
----------------------------------------------------------------------
Message: 1
Date: Mon, 30 Oct 2023 08:09:30 -0400
From: Dave M <2wheels...@gmail.com>
To: dhcp-users@lists.isc.org
Subject: Sending dynamic boot filename to clients
Message-ID:
<CACx_ihET9d5+PSuNohCJHRE=rj3_c4zaj-emi_azpq2v4zo...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
Hello,
I'm currently running version isc-dhcpd-4.4.1 on Ubuntu 20.04. I'm planning
to migrate to Kea but having tried the configuration assistant left me with
more questions than answers to I will need to manually build this config
and it will be a month long project.
I'm trying to set the boot file name for my clients dhcp6 to be dynamically
generated based on the client-id. I have a similar setup working on dhcp4
but can't get it to work on IPv6. These are DOCSIS cable modems trying to
boot and acquire their config.
What I have setup is the following
# declare the option space where the CableLabs options live
option space docsis code width 2 length width 2 hash size 100;
option docsis.tftp-servers code 32 = array of ip6-address;
option docsis.configuration-file code 33 = text;
option docsis.syslog-servers code 34 = array of ip6-address;
option docsis.time-servers code 37 = array of ip6-address;
option docsis.time-offset code 38 = signed integer 32;
option vsio.docsis code 4491 = encapsulate docsis;
subnet6 2001:428:XXXX:1300::/64 {
range6 2001:428:XXXX:1300::ff01 2001:428:XXXX:1300::ffff;
set hw_mac_short = concat (
suffix(concat("0", binary-to-ascii (16, 8, "",
substring(suffix(option dhcp6.client-id, 6),0,1))),2),
suffix(concat("0", binary-to-ascii (16, 8, "",
substring(suffix(option dhcp6.client-id, 6),1,1))),2),
suffix(concat("0", binary-to-ascii (16, 8, "",
substring(suffix(option dhcp6.client-id, 6),2,1))),2),
suffix(concat("0", binary-to-ascii (16, 8, "",
substring(suffix(option dhcp6.client-id, 6),3,1))),2),
suffix(concat("0", binary-to-ascii (16, 8, "",
substring(suffix(option dhcp6.client-id, 6),4,1))),2),
suffix(concat("0", binary-to-ascii (16, 8, "",
substring(suffix(option dhcp6.client-id, 6),5,1))),2)
);
set configfile = concat(hw_mac_short, ".cfg");
log (info, "Sending config...");
log (info, concat ("Sending config file ", configfile, " to device
", hw_mac_short));
option dhcp6.domain-search "cm.den.company.com";
option docsis.time-offset -24200;
option docsis.configuration-file = concat("cache/ONU-", configfile);
#option docsis.configuration-file "cache/3basic_OLT.cfg";
option docsis.tftp-servers 2001:428:XXXX:100:172:19:0:200;
option docsis.time-servers 2001:428:XXXX:100:172:19:0:200;
on commit {
execute("/etc/dhcp/htprov_defaultolt.sh", configfile);
}
}
I added the log entries to confirm that the data was correctly calculated
and it works:
Oct 30 05:55:01 hus-provserver dhcpd[3162636]: Sending config...
Oct 30 05:55:01 hus-provserver dhcpd[3162636]: Sending config file
f8345a7e48e2.cfg to device f8345a7e48e2
But in the packet trace, the config file field is always missing
Vendor-specific Information
Option: Vendor-specific Information (17)
Length: 52
Enterprise ID: Cable Television Laboratories, Inc. (4491)
Suboption: TFTP Server Addresses : (32)
2001:428:XXXX:100:172:19:0:200
Suboption: Time Protocol Servers : (37)
2001:428:XXXX:100:172:19:0:200
Suboption: Time Offset = (38)-24200
When I comment out the dynamic filename and enable the static one
#option docsis.configuration-file = concat("cache/ONU-",
configfile);
option docsis.configuration-file "cache/3basic_OLT.cfg";
Then the static name is sent as expected:
Vendor-specific Information
Option: Vendor-specific Information (17)
Length: 76
Enterprise ID: Cable Television Laboratories, Inc. (4491)
Suboption: TFTP Server Addresses : (32)
2001:428:XXXX:100:172:19:0:200
Suboption: Configuration File Name = (33)"cache/3basic_OLT.cfg"
Suboption: Time Protocol Servers : (37)
2001:428:XXXX:100:172:19:0:200
Suboption: Time Offset = (38)-24200
Would anybody have a possible pointer at what I'm doing wrong?
Thanks
Dave M.
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Message: 2
Date: Mon, 30 Oct 2023 13:57:36 +0100
From: Darren Ankney <darren.ank...@gmail.com>
To: Users of ISC DHCP <dhcp-users@lists.isc.org>
Subject: Re: Sending dynamic boot filename to clients
Message-ID:
<CAKabWHjuZJFs1184k5xPUgGPMmC2X-_0Yhws4p9=sbmm6kc...@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Hi Dave,
Perhaps it is due to the difference here:
option docsis.configuration-file = concat("cache/ONU-", configfile);
#option docsis.configuration-file "cache/3basic_OLT.cfg";
note that the first line contains an '=' and the second does not.
I've not done what you are doing, so I don't know for sure if the
equal sign would be required. Just something to try? If that doesn't
work, I'd try performing the entire concat while setting the variable,
like so:
set configfile = concat("cache/ONU-", hw_mac_short, ".cfg");
Then you could set the option like so:
option docsis.configuration-file configfile;
which I assume would work but haven't tested.
Thank you,
Darren Ankney
On Mon, Oct 30, 2023 at 1:09?PM Dave M <2wheels...@gmail.com> wrote:
>
> Hello,
>
> I'm currently running version isc-dhcpd-4.4.1 on Ubuntu 20.04. I'm planning
> to migrate to Kea but having tried the configuration assistant left me with
> more questions than answers to I will need to manually build this config and
> it will be a month long project.
>
> I'm trying to set the boot file name for my clients dhcp6 to be dynamically
> generated based on the client-id. I have a similar setup working on dhcp4 but
> can't get it to work on IPv6. These are DOCSIS cable modems trying to boot
> and acquire their config.
>
> What I have setup is the following
>
> # declare the option space where the CableLabs options live
> option space docsis code width 2 length width 2 hash size 100;
> option docsis.tftp-servers code 32 = array of ip6-address;
> option docsis.configuration-file code 33 = text;
> option docsis.syslog-servers code 34 = array of ip6-address;
> option docsis.time-servers code 37 = array of ip6-address;
> option docsis.time-offset code 38 = signed integer 32;
> option vsio.docsis code 4491 = encapsulate docsis;
>
> subnet6 2001:428:XXXX:1300::/64 {
> range6 2001:428:XXXX:1300::ff01 2001:428:XXXX:1300::ffff;
> set hw_mac_short = concat (
> suffix(concat("0", binary-to-ascii (16, 8, "",
> substring(suffix(option dhcp6.client-id, 6),0,1))),2),
> suffix(concat("0", binary-to-ascii (16, 8, "",
> substring(suffix(option dhcp6.client-id, 6),1,1))),2),
> suffix(concat("0", binary-to-ascii (16, 8, "",
> substring(suffix(option dhcp6.client-id, 6),2,1))),2),
> suffix(concat("0", binary-to-ascii (16, 8, "",
> substring(suffix(option dhcp6.client-id, 6),3,1))),2),
> suffix(concat("0", binary-to-ascii (16, 8, "",
> substring(suffix(option dhcp6.client-id, 6),4,1))),2),
> suffix(concat("0", binary-to-ascii (16, 8, "",
> substring(suffix(option dhcp6.client-id, 6),5,1))),2)
> );
> set configfile = concat(hw_mac_short, ".cfg");
> log (info, "Sending config...");
> log (info, concat ("Sending config file ", configfile, " to device ",
> hw_mac_short));
> option dhcp6.domain-search "cm.den.company.com";
> option docsis.time-offset -24200;
> option docsis.configuration-file = concat("cache/ONU-", configfile);
> #option docsis.configuration-file "cache/3basic_OLT.cfg";
> option docsis.tftp-servers 2001:428:XXXX:100:172:19:0:200;
> option docsis.time-servers 2001:428:XXXX:100:172:19:0:200;
> on commit {
> execute("/etc/dhcp/htprov_defaultolt.sh", configfile);
> }
> }
>
> I added the log entries to confirm that the data was correctly calculated and
> it works:
> Oct 30 05:55:01 hus-provserver dhcpd[3162636]: Sending config...
> Oct 30 05:55:01 hus-provserver dhcpd[3162636]: Sending config file
> f8345a7e48e2.cfg to device f8345a7e48e2
>
> But in the packet trace, the config file field is always missing
> Vendor-specific Information
> Option: Vendor-specific Information (17)
> Length: 52
> Enterprise ID: Cable Television Laboratories, Inc. (4491)
> Suboption: TFTP Server Addresses : (32)
> 2001:428:XXXX:100:172:19:0:200
> Suboption: Time Protocol Servers : (37)
> 2001:428:XXXX:100:172:19:0:200
> Suboption: Time Offset = (38)-24200
>
> When I comment out the dynamic filename and enable the static one
> #option docsis.configuration-file = concat("cache/ONU-", configfile);
> option docsis.configuration-file "cache/3basic_OLT.cfg";
>
> Then the static name is sent as expected:
> Vendor-specific Information
> Option: Vendor-specific Information (17)
> Length: 76
> Enterprise ID: Cable Television Laboratories, Inc. (4491)
> Suboption: TFTP Server Addresses : (32)
> 2001:428:XXXX:100:172:19:0:200
> Suboption: Configuration File Name = (33)"cache/3basic_OLT.cfg"
> Suboption: Time Protocol Servers : (37)
> 2001:428:XXXX:100:172:19:0:200
> Suboption: Time Offset = (38)-24200
>
> Would anybody have a possible pointer at what I'm doing wrong?
>
> Thanks
>
> Dave M.
>
> --
> ISC funds the development of this software with paid support subscriptions.
> Contact us at https://www.isc.org/contact/ for more information.
>
> dhcp-users mailing list
> dhcp-users@lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
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