Log host identifier

[Bill Shirley]

I think you're confused. A  "known host" is any host that is defined.  It
can be static or dynamic.  Consider:
host printer_1 {
     hardware ethernet 00:11:22:33:44:55;
     fixed-address 172.16.20.201;
}
host printer_2 {
     hardware ethernet 11:22:33:44:55:66;
}
printer_1 will get a static address; printer_2 will get dynamic; both are
known hosts because they are defined. MAC address 22:33:44:55:66:77
is not defined in the dhcpd.conf and therefore is an "unknown-client".

HTH,
Bill


On 10/19/2017 5:26 AM, Narcis Garcia wrote:
>
> Okay, I've solved with your example, dhcp-eval manpage, and Glenn Satchell's AA-01039 answer in ISC*:*
>
> on commit {
>         if static {
>                 set KnownHost = pick-first-value(host-decl-name, "(none)");
>         } else {
>                 set KnownHost = "(dynamic)";
>         }
>         set MacString = concat(
>
>                 suffix(concat ("0", binary-to-ascii (16, 8, "", substring(hardware,1,1))),2), ":",
>
>                 suffix(concat ("0", binary-to-ascii (16, 8, "", substring(hardware,2,1))),2), ":",
>                 suffix(concat ("0", binary-to-ascii (16, 8, "", substring(hardware,3,1))),2), ":",
>                 suffix(concat ("0", binary-to-ascii (16, 8, "", substring(hardware,4,1))),2), ":",
>                 suffix(concat ("0", binary-to-ascii (16, 8, "", substring(hardware,5,1))),2), ":",
>                 suffix(concat ("0", binary-to-ascii (16, 8, "", substring(hardware,6,1))),2)
>         );
>
>         log(info, concat(
>                 "KnownHost:", KnownHost
>                 ," ClientHostname:", pick-first-value(option fqdn.hostname, option host-name, config-option 
> server.ddns-hostname, "(none)")
>                 ," MAC:", MacString
>                 ," leased-address:", pick-first-value( binary-to-ascii(10, 8, ".", leased-address), "(none)")
>                 ," lease-time:", pick-first-value(binary-to-ascii(10,32,"",encode-int(lease-time,32)), "(none)")
>         ));
> }
>
>
>
> El 19/10/17 a les 09:27, Narcis Garcia ha escrit:
>> Thank you;
>>
>> Is there some way to get the label of the host definition instead of
>> having to add a hostname/fqdn/identifier to each host?
>>
>> (such as "printer_1" here)
>>
>> host printer_1 {
>> 	hardware ethernet 00:11:22:33:44:55;
>> 	fixed-address 172.16.20.201;
>> }
>>
>>
>> El 19/10/17 a les 09:12, Bill Shirley ha escrit:
>>> Add logging to your dhcpd.conf.  Here is what I use:
>>> on commit {
>>>      if static {
>>>          set is-static = " --> STATIC";
>>>
>>>          option dhcp-renewal-time    = encode-int(43200 / 2, 32);    #
>>> 43200 = 12 hours
>>>          option dhcp-rebinding-time    = encode-int(43200 * 7 / 8, 32);
>>>          ddns-ttl            = encode-int((43200 / 2) + 1, 32);
>>>      } else {
>>>          set is-static = "";
>>>
>>>          option dhcp-renewal-time    = encode-int(lease-time / 2, 32);
>>>          option dhcp-rebinding-time    = encode-int(lease-time * 7 / 8, 32);
>>>          ddns-ttl            = encode-int((lease-time / 2) + 1, 32);
>>>      }
>>>
>>>      log (   info,
>>>          concat (
>>>              "Host:", pick-first-value(option fqdn.hostname, option
>>> host-name, "(none)"), "=>", pick-first-value(config-option
>>> server.ddns-hostname, "(none)")
>>>
>>>              ,"  VendorId:", pick-first-value(option
>>> vendor-class-identifier, "(none)")
>>>
>>>              ,"  Lease:",
>>> pick-first-value(binary-to-ascii(10,32,"",encode-int(lease-time,32)),
>>> "(none)")
>>>              ,"  Renewal:", pick-first-value(binary-to-ascii(10, 32, "",
>>> config-option dhcp-renewal-time), "(none)")
>>>              ,"  Rebind:", pick-first-value(binary-to-ascii(10, 32, "",
>>> config-option dhcp-rebinding-time), "(none)")
>>>
>>>              ,"  TTL:", pick-first-value(binary-to-ascii(10, 32, "",
>>> config-option server.ddns-ttl), "(none)")
>>>
>>>              ,"  GIaddr:", pick-first-value(binary-to-ascii(10, 8, ".",
>>> packet(24,4)), "(none)")
>>>              , is-static
>>>          )
>>>      );
>>> }
>>>
>>> Bill
>>>
>>>
>>> On 10/19/2017 3:00 AM, Narcis Garcia wrote:
>>>> isc-dhcp-server is currently logging in my system:
>>>> DHCPDISCOVER from 11:22:33:44:55:66 via eth0
>>>> DHCPOFFER on 172.16.20.201 to 11:22:33:44:55:66 via eth0
>>>> DHCPREQUEST for 172.16.20.201 from 11:22:33:44:55:66 via eth0
>>>> DHCPACK on 172.16.20.201 to 11:22:33:44:55:66 via eth0
>>>>
>>>> How can I make the service logs some name about that known client? (such
>>>> as "printer_1")
>>>>
>>>> Thanks.
>>>> _______________________________________________
>>>> dhcp-users mailing list
>>>> dhcp-users at lists.isc.org
>>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>>
>>> _______________________________________________
>>> dhcp-users mailing list
>>> dhcp-users at lists.isc.org
>>> https://lists.isc.org/mailman/listinfo/dhcp-users
>>>
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>
>
>
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