[Kea-users] Testing option 43
Kraishak Mahtha
kraishak.edu at gmail.com
Sun Jun 18 05:34:19 UTC 2023
Hi Darren,
This might be best kept out of the global area (use in subnet, classes
etc..),
------>do you mean the following?
"subnet4": [
{
"subnet": "4.0.0.0/16",
"valid-lifetime": 86400,
"option-def": [{
"code": 43,
"name": "vendor-encapsulated-options",
"type": "string",
"space": "dhcp4"
}],
"option-data": [
{
"name": "vendor-encapsulated-options",
"data": "any old string"
},
{
"data": "6.6.6.6, 7.7.7.7, 8.8.8.4",
"name": "domain-name-servers"
},
{
"data": "86400",
"name": "dhcp-lease-time"
},
{
"data": "255.255.0.0",
"name": "subnet-mask"
},
{
"data": "4.0.0.1",
"name": "routers"
}],
"pools": [
{
"pool": "4.0.0.2-4.0.6.125"
}
],
"id": 786173
},
but it gives a syntax error for me and I don't see any reference in any
forums too that declares the option definition within the subnet.
On Thu, Jun 15, 2023 at 9:21 PM Darren Ankney <darren.ankney at gmail.com>
wrote:
> Hi Kraishak,
>
> I am informed by a colleague that you can redefine the expected
> contents of option 43 as shown:
> "option-def": [
> {
> "name": "vendor-encapsulated-options",
> "code": 43,
> "type": "string"
> }
> "option-data": [
> {
> "name": "vendor-encapsulated-options",
> "data": "any old string"
> },
> ]
> which will allow you to store strings directly in the option. This
> might be best kept out of the global area (use in subnet, classes
> etc..), however, in case you need to use option 43 in the default way
> with sub-options.
>
> Thank you,
>
> Darren Ankney
>
> On Wed, Jun 14, 2023 at 10:03 AM Kraishak Mahtha <kraishak.edu at gmail.com>
> wrote:
> >
> > Yes, for a few of my lab centers that run using the ISC, I have checked
> the config and they only have option 43 in their subnet without any option
> spaces so I thought it would be the same for kea.
> > I don't have much familiarity with this option 43 but the current
> clients in the subnet do use option 43, My existing production has the same
> options with different values (a domain, number, and text) . I just
> replaced them with some random text and I am checking the tcpdump of both
> ISC and Kea server output to make sure I see the same results.
> >
> > In ISC tcpdump I can see the option value for option 43 and for kea, it
> is missing completely
> >
> > TIME: 13:59:13.451640
> > IP: > (00:50:56:99:38:1c) > (00:50:56:99:5c:f3)
> > OP: 2 (BOOTPREPLY)
> > HTYPE: 1 (Ethernet)
> > HLEN: 6
> > HOPS: 0
> > XID: 36835441
> > SECS: 0
> > FLAGS: 7f80
> > CIADDR: 0.0.0.0
> > YIADDR: 3.4.0.2
> > SIADDR: 0.0.0.0
> > GIADDR: 3.4.0.1
> > CHADDR: a1:21:2f:00:00:01:00:00:00:00:00:00:00:00:00:00
> > SNAME: .
> > FNAME: .
> > OPTION: 53 ( 1) DHCP message type 5 (DHCPACK)
> > OPTION: 54 ( 4) Server identifier 192.168.0.81
> > OPTION: 51 ( 4) IP address leasetime 86400 (24h)
> > OPTION: 1 ( 4) Subnet mask 255.255.0.0
> > OPTION: 3 ( 4) Routers 3.4.0.1
> > OPTION: 6 ( 12) DNS server 6.6.6.6,7.7.7.7,8.8.8.4
> > OPTION: 15 ( 11) Domainname test.com
> > OPTION: 43 ( 11) Vendor specific info 74657374 test
> >
> >
> > >>It sounds like you should be able to send data that isn't a
> suboption, but I cannot find anywhere in the ARM that indicates that Kea
> supports this.
> > ---> This is the major thing if we have different behavior change for
> option 43 in kea compared to ISC
> >
> > On Wed, Jun 14, 2023 at 6:48 PM Darren Ankney <darren.ankney at gmail.com>
> wrote:
> >>
> >> Hi Kraishak,
> >>
> >> I don't know if I can provide more specific information than is
> >> contained in the RFC 2132 section about option 43:
> >> https://www.rfc-editor.org/rfc/rfc2132#section-8.4
> >>
> >> According to the RFC, the data in option 43 is "opaque" as it is meant
> >> to be vendor specific. It sounds like you should be able to send data
> >> that isn't a suboption, but I cannot find anywhere in the ARM that
> >> indicates that Kea supports this. It definitely supports sending
> >> sub-options of option 43 which is the usual case encountered in
> >> practice.
> >>
> >> Thank you,
> >>
> >> Darren Ankney
> >>
> >> On Wed, Jun 14, 2023 at 8:46 AM Kraishak Mahtha <kraishak.edu at gmail.com>
> wrote:
> >> >
> >> > Hi Darren,
> >> >
> >> > I am testing for each option and its corresponding behavior in kea by
> checking the tcpdump and packet4.log mainly
> >> >
> >> > Can you please confirm one thing, so basically to use option 43 do we
> must need to define the vendor-encapsulated-options-space in both ISC and
> Kea-DHCP?
> >> >
> >> > I am a bit confused here, maybe it would be basic but can you please
> give me more info on it or any reference link so that I can understand the
> scope of option 43
> >> >
> >> > Thanks In Advance
> >> > Kraishak
> >> >
> >> > On Tue, Jun 13, 2023 at 6:08 PM Darren Ankney <
> darren.ankney at gmail.com> wrote:
> >> >>
> >> >> Hi Kraishak,
> >> >>
> >> >> Does this do something for some device you are trying to support?
> >> >>
> >> >> option vendor-encapsulated-options "test";
> >> >>
> >> >> Typically, option 43 is defined on the basis of something that a
> >> >> vendor device needs to receive. That gives some constraints
> regarding
> >> >> how it is configured. Most of the time, it will be a collection of
> >> >> one or more sub-options. For example, here is one vendor's passing
> of
> >> >> a URL for tr69 in ISC DHCP:
> >> >>
> >> >> option space CALIXGC;
> >> >> option CALIXGC.acs-url code 1 = text;
> >> >> vendor-option-space CALIXGC;
> >> >> option CALIXGC.acs-url "http://someurl";
> >> >>
> >> >> which, translated to Kea, would look like this:
> >> >>
> >> >> "option-def": [
> >> >> {
> >> >> "space": "CALIXGC",
> >> >> "name": "acs-url",
> >> >> "code": 1,
> >> >> "type": "string"
> >> >> },
> >> >> {
> >> >> "name": "vendor-encapsulated-options",
> >> >> "code": 43,
> >> >> "type": "empty",
> >> >> "encapsulate": "CALIXGC"
> >> >> }
> >> >> ],
> >> >> "option-data": [
> >> >> {
> >> >> "name": "vendor-encapsulated-options",
> >> >> "code": 43
> >> >> },
> >> >> {
> >> >> "space": "CALIXGC",
> >> >> "name": "acs-url",
> >> >> "code": 1,
> >> >> "data": "http://someurl"
> >> >> }
> >> >> ]
> >> >>
> >> >> See if you can send that to your device or discover what actual data
> >> >> your device needs and we can see how that might be configured?
> >> >>
> >> >> Thank you,
> >> >>
> >> >> Darren Ankney
> >> >>
> >> >> On Tue, Jun 13, 2023 at 7:42 AM Kraishak Mahtha <
> kraishak.edu at gmail.com> wrote:
> >> >> >
> >> >> > Hi Darren,
> >> >> >
> >> >> > Thank you for the suggestion but I am still facing the same
> problem.
> >> >> >
> >> >> > {
> >> >> > "code": "43",
> >> >> > "csv-format": true,
> >> >> > "data": "74657374",
> >> >> > },
> >> >> >
> >> >> > ---> With the above format I am getting a few issues because of
> double quotes for the code, and for CSV format, If I set that to true I am
> getting an error as
> >> >> > 2023-06-13 06:23:40.309 ERROR
> [kea-dhcp4.dhcp4/6561.139810011805888] DHCP4_PARSER_FAIL failed to create
> or run parser for configuration element subnet4: option data does not match
> option definition (space: dhcp4, code: 43): attempt to write invalid option
> data field type into the option buffer: 0 (kea-dhcp4.conf:60:27)
> >> >> > Error encountered: option data does not match option definition
> (space: dhcp4, code: 43): attempt to write invalid option data field type
> into the option buffer: 0 (kea-dhcp4.conf:60:27)
> >> >> >
> >> >> > The final trial is as follows:
> >> >> > {
> >> >> > "code": "43",
> >> >> > "csv-format": false,
> >> >> > "data": "74657374",
> >> >> > },
> >> >> >
> >> >> > This also gave me an empty for option 43 in the ACK packet.
> >> >> >
> >> >> > This is the subnet of the ISC config that I using for testing
> >> >> > subnet 3.4.0.0 netmask 255.255.0.0 {
> >> >> > pool {
> >> >> > range 3.4.0.2 3.4.0.5;
> >> >> > range 3.4.0.12 3.4.0.16;
> >> >> > range 3.4.0.41 3.4.0.56;
> >> >> > }
> >> >> > default-lease-time 86400;
> >> >> > max-lease-time 86400;
> >> >> > option domain-name "test.com";
> >> >> > option domain-name-servers 6.6.6.6,7.7.7.7,8.8.8.4;
> >> >> > option routers 3.4.0.1;
> >> >> > option subnet-mask 255.255.0.0;
> >> >> > option vendor-encapsulated-options "test";
> >> >> > }
> >> >> >
> >> >> > Thanks
> >> >> > Kraishak
> >> >> >
> >> >> >
> >> >> >
> >> >> > On Tue, Jun 13, 2023 at 12:35 AM Darren Ankney <
> darren.ankney at gmail.com> wrote:
> >> >> >>
> >> >> >> Hi Kraishak,
> >> >> >>
> >> >> >> Have a look here:
> >> >> >>
> https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp4-srv.html?highlight=%22vendor-encapsulated-options%22#dhcpv4-vendor-specific-options
> >> >> >>
> >> >> >> You might need to setup encapsulated sub-options and tell Kea to
> >> >> >> include the "vendor-encapsulated-options-space" content in the
> options
> >> >> >> as a sub-option:
> >> >> >>
> >> >> >> "option-data": [
> >> >> >> {
> >> >> >> "name": "REPLACE_ME",
> >> >> >> "space": "vendor-encapsulated-options",
> >> >> >> "code": 1,
> >> >> >> "csv-format": false,
> >> >> >> "data": "74657374"
> >> >> >> },
> >> >> >> {
> >> >> >> "name": "vendor-encapsulated-options"
> >> >> >> }
> >> >> >> ]
> >> >> >>
> >> >> >> So, above, first the data is added as a sub-option of option 43
> >> >> >> (option 43 typically consists of one or more sub-options).
> Replace
> >> >> >> "REPLACE_ME" with the name of the sub-option you are trying to
> send (I
> >> >> >> think you can omit name entirely if there is none as that part
> isn't
> >> >> >> sent). Set the code to the correct sub-option number. If this
> >> >> >> particular data should not be a sub-option, then you might have
> to do
> >> >> >> something like this:
> >> >> >>
> >> >> >> {
> >> >> >> "code": "43",
> >> >> >> "csv-format": true,
> >> >> >> "data": "74657374",
> >> >> >> },
> >> >> >>
> >> >> >> please note that if "csv-format" is set to false, then Kea will be
> >> >> >> expecting "a hexadecimal string." see:
> >> >> >>
> https://kea.readthedocs.io/en/kea-2.2.0/arm/dhcp4-srv.html?highlight=%22csv-format%22#standard-dhcpv4-options
> >> >> >>
> >> >> >> Can you share the option 43 portion of the ISC DHCP configuration
> you
> >> >> >> are trying to convert if you still have trouble?
> >> >> >>
> >> >> >> Thank you,
> >> >> >>
> >> >> >> Darren Ankney
> >> >> >>
> >> >> >> On Mon, Jun 12, 2023 at 1:59 PM Kraishak Mahtha <
> kraishak.edu at gmail.com> wrote:
> >> >> >> >
> >> >> >> > Hi,
> >> >> >> > I am trying to convert my ISC config to kea-equivalent and
> testing the changes as part of the testing, I am stuck at testing option 43
> ,
> >> >> >> > Using the keama tool I convert my ISC config to Kea equivalent
> config and tested the leases but in the DHCP ACK packet I cannot see option
> 43 coming when I operate with Kea
> >> >> >> >
> >> >> >> > sample code config for option 43 that I used in my testing
> subnet
> >> >> >> > {
> >> >> >> > "data": "74657374",
> >> >> >> > "name": "vendor-encapsulated-options",
> >> >> >> > "csv-format": false
> >> >> >> > },
> >> >> >> >
> >> >> >> > But in log and tcpdump I see the empty value for option 43
> >> >> >> >
> >> >> >> > Log:
> >> >> >> > ===
> >> >> >> > 2023-06-12 15:10:26.284 DEBUG
> [kea-dhcp4.packets/30590.140464453838592] DHCP4_RESPONSE_DATA [hwtype=1
> 21:21:2f:00:00:01], cid=[01:21:21:2f:00:00:01]x8259145: responding with
> packet DHCPACK (type 5), packet details: local_address=192.168.0.125:67,
> remote_address=4.0.0.1:67, msg_type=DHCPACK (5), =0x8259145,
> >> >> >> > options:
> >> >> >> > type=001, len=004: 4294901760 (uint32)
> >> >> >> > type=003, len=004: 4.0.0.1
> >> >> >> > type=006, len=012: 6.6.6.6 7.7.7.7 8.8.8.4
> >> >> >> > type=012, len=018: "dhcp-client-000001" (string)
> >> >> >> > type=015, len=011: "test.com" (string)
> >> >> >> > type=043, len=000: ----->Empty Value, and I cross-verified
> the tcpdump too.
> >> >> >> > type=051, len=004: 86400 (uint32)
> >> >> >> > type=053, len=001: 5 (uint8)
> >> >> >> > type=054, len=004: 192.168.0.125
> >> >> >> > type=061, len=007: 01:21:21:2f:00:00:01
> >> >> >> >
> >> >> >> > I have checked the discover packet option 55 just to make sure
> if my packet is asking for option 43 or not, and yes I can see option 43 in
> the option 55 parameter value.
> >> >> >> >
> >> >> >> > I am not sure what is wrong I am doing, Can someone who has
> familiar can guide me
> >> >> >> >
> >> >> >> > Thanks in Advance
> >> >> >> > Kraishak
> >> >> >> > --
> >> >> >> > ISC funds the development of this software with paid support
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> information.
> >> >> >> >
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> >> >> >> >
> >> >> >> > Kea-users mailing list
> >> >> >> > Kea-users at lists.isc.org
> >> >> >> > https://lists.isc.org/mailman/listinfo/kea-users
> >> >> >> --
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> information.
> >> >> >>
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> >> >> >>
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> >> >> --
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> information.
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