Ipv6 hostname in dhclient.conf

[Anjali Krishna]

Hi Bill,

Thank you for the support

The hostname is updating in the lease file after updating  this line in
dhclient

send fqdn.fqdn "hostname.example.com."

The dot after the com was missing after this change it did work.



On Tue, 28 Jul 2020, 4:28 pm Bill Shirley, <bill at c3po.polymerindustries.biz>
wrote:

> On the server, did you implement?:
> set my_given_hostname = option fqdn.hostname;
> It should be in the lease file even if it is blank.
>
> Run tcpdump on the dhcp server to see exactly what is sent/received:
> tcpdump -vv -e -n -i eth0 portrange 67-68
> For IPv6.
> tcpdump -X -l -vv -e -n -i eth0 portrange 546-547
>
> Bill
> On 7/28/2020 4:27 AM, Anjali Krishna wrote:
>
> Hi Bill Shirley,
>
>    Thank you for the reply
>
>     The code snippet which you have shared I tried under dhcpd.conf
>
> The my_duid_hex  and my_duid variables are updating with the values
>
> I tried with "send fqdn.hostname "test_dut"  " in dhclient.conf file.
>
> But the hostname is not still updating in the lease file
>
> What am I missing in client side?
>
> On Tue, 28 Jul 2020, 1:49 am Bill Shirley, <
> bill at c3po.polymerindustries.biz> wrote:
>
>> You can save your own variables in the leases file for non-static leases:
>> on commit {
>>     if static {
>> #        set is-static = " --> STATIC";
>>     } else {
>>         set is-static = "";
>>         set my_duid = option dhcp6.client-id;
>>         set my_duid_hex = pick-first-value(binary-to-ascii(16, 8, ":",
>> option dhcp6.client-id), "");
>>         set my_given_hostname = option fqdn.hostname;
>>     }
>> }
>>
>> Lease:
>> ia-na "mbl\022\000\001\000\001\025Yy\267lbm\207\267\370" {
>>   cltt 0 2020/07/12 12:45:07;
>>   iaaddr 2001:xxxx:yyyy:40:50f7::ee {
>>     binding state active;
>>     preferred-life 9000;
>>     max-life 14400;
>>     ends 0 2020/07/12 16:45:07;
>>     set ddns-rev-name = "<redacted>";
>>     set ddns-dhcid =
>> "\000\002\001\320F0\342\231\334\262\211\351u\023\260\207\200\240%\230\004ZD\035\370\221f\367E\225\245e\234\2154";
>>     set ddns-fwd-name = "Karen-PC.example.com";
>>     set my_MAC = "6c:62:6d:87:b7:f8";
>>     set my_given_hostname = "Karen-PC";
>>     set my_duid_hex = "0:1:0:1:15:59:79:b7:6c:62:6d:87:b7:f8";
>>     set my_duid = "\000\001\000\001\025Yy\267lbm\207\267\370";
>>     set member_of = "Microsoft";
>>     set pool_type = "Microsoft";
>>   }
>> }
>>
>> Hope this helps,
>> Bill
>> On 7/27/2020 8:04 AM, Anjali Krishna wrote:
>>
>>
>> Hi
>>
>>  I am using an embedded board with hostname "test_dut"[same under
>> /etc/hostname]. I am testing ipv6 ans ipv4 using dhcpd on server side with
>> - 6, - 4 options and client side I am using dhclient with - 6 and - 4
>> option for ipv6 and ipv4 respectively.
>>  Both the cases Ip assignment is happening without any trouble. But in
>> order to extend our application feature we are providing the information of
>> the connected devices to the user such as mac id, ip, hostname/client name
>> etc. In ipv4 these information are provided under dhcpd.leases file. In
>> case of ipv6 I am not able to find the hostname (test_dut) under the
>> dhcpd6.leases files
>>
>> I tried with adding various options under dhclient.conf such as send
>> host-name "test_dut" and edited the dhclient-script under /sbin and called
>> set_hostname call under bound-renew-reboot section of ipv6. Still the
>> server lease file is not updating the hostname for ipv6 . But hostname is
>> updating for ipv4 connection.
>>
>> How can I resolve this issue?
>>
>> Regards,
>> Anjali
>>
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>
> _______________________________________________
> 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 listdhcp-users at lists.isc.orghttps://lists.isc.org/mailman/listinfo/dhcp-users
>
> _______________________________________________
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> subscriptions. Contact us at https://www.isc.org/contact/ for more
> information.
>
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