migrate from remotely located to central servers

[Jason Brooks]

Hi Bill,

I will sit down and re-read the man pages: thank you for the reminder.

good to know about the dns servers.

and thanks or the log statement suggestions.

A note from Simon Hobson had me understand that the client must ask for the
information, so I am going to re-construct my test query to see if the tftp
information comes back.  But thanks for the suggestions to force options.

--jason

On Thu, Jul 30, 2020 at 6:51 AM Bill Shirley <
bill at c3po.polymerindustries.biz> wrote:

> ISC documentation:
> https://kb.isc.org/docs/isc-dhcp-44-manual-pages-dhcp-options
>
> Looks like your domain-name-servers option is incorrect:
> option domain-name-servers 8.8.8.8, *8.8*.4.4;
>
> Add this to your log statement to see the options requested:
>     "  ReqOpt:", pick-first-value(binary-to-ascii(10, 8, ",", option
> dhcp-parameter-request-list), "(none)"),
> Make sure the client is requesting option 66.  BTW, if the dhcpd
> encounters a null
> in the log text, it will truncate the rest of the line.  That's why I use
> 'pick-first-value' a lot.
>
> If it's not requesting option 66, you might try forcing the option.  I've
> never used this:
> if exists dhcp-parameter-request-list {
> # Always send the local-pac-server (252) option (specified in hexadecimal,
> ie: 252 = 0xfc)
>     option dhcp-parameter-request-list = concat(option
> dhcp-parameter-request-list, fc);
> }
>
> I have used this to replace the entire requested option list:
> option dhcp-parameter-request-list = 01: 03: 06: 0c: 0f: 1c: 2a;
>
> Bill
> On 7/29/2020 7:45 PM, Jason Brooks wrote:
>
> Hello Bill,
>
> At first I didn't understand, but now I do. Once I defined the pool
> denying class members, I was able to get ip addresses in the
> 192.168.188.range. Thanks!
>
> I began to run "dhcpd -d" and playing with the log output to see if my
> substring statements were even making sense.
>
> So with the circuit id substring statements, I wasn't comparing
> correctly.  It's not clear why 3.0.4 worked this way.  I needed the two
> bytes on the far right side of the circuit id...thus
>
> the lines:
>      "and ( substring (option agent.circuit-id,2,2)="\x01\x2C" )"
> became:
>      "and ( suffix ( option agent.circuit-id, 4) ="012C" )"
>
> note the use of suffix rather than substring and the lack of "\x" inside
> the double quotes.
>
> So my next issue here is in the RegionX-BOOT-CPE-MODELx class declaration,
> tftp-server-name is not being returned.  Whereas the boot filename is.  Why
> not? Based on what I found 'tftp-server-name" should correspond to dhcp
> option 66: defined in rfc2132.
>
> I have noticed that it's hard to figure out which isc dhcpd options map to
> those defined in the rfcs.  I found THIS table
> <http://www.ipamworldwide.com/ipam/isc-dhcpv4-options.html>, which
> helps.  Is there a cross-reference like this in the isc dhcpd docs
> somewhere?
>
> Enclosed is my updated, sanitized dhcpd.conf file with your suggested
> alterations and a few more of my own.
>
> Thank you thus far for your time!
>
> --jason
>
> On Wed, Jul 29, 2020 at 11:51 AM Bill Shirley <
> bill at c3po.polymerindustries.biz> wrote:
>
>> So, the DISCOVER is not matching any of your classes.  Define another
>> pool to issue
>> leases from that doesn't match any class:
>>      pool {
>>         deny members of "RegionX-RGMGMT-CPE-MODELx";
>>         deny members of "RegionX-BOOT-CPE-MODELx";
>>         deny members of "RegionX-INET";
>>
>>         deny dynamic bootp clients;
>>         authoritative;
>>         range 192.168.xxx.2 192.168.xxx.15;
>>     }
>>
>> This should issue a lease and trigger your 'on commit' log statement.
>>
>> Bill
>>
>>
>>
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