DDNS TTL in 4.3
dougb at dougbarton.email
Wed Apr 22 21:45:59 UTC 2015
On 4/22/15 3:17 AM, Tony Finch wrote:
> Doug Barton <dougb at dougbarton.email> wrote:
>> In 4.2 and previous it was true that the TTL sent for DDNS requests was 1/2
>> the default lease time. In 4.3 it seems that there is no TTL value sent, so
>> the DDNS records simply inherit the zone default TTL.
> The DNS UPDATE protocol does not allow you to omit the TTL so this
> explanation cannot be right! Also the zone default TTL is just an
> abbreviation allowed by the master file format, and it doesn't exist
> in other parts of the DNS protocol.
> I think what you are observing is that isc-dhcp by default caps the TTL to
> one hour, which happens to be the same as your default TTL.
> There is an item in the release notes:
> and a helpful comment in the source code:
I am conducting an experiment in the efficacy of PGP/MIME signatures.
This message should be signed. If it is not, or the signature does not
validate, please let me know how you received this message (direct, or
to a list) and the mail software you use. Thanks!
-------------- next part --------------
A non-text attachment was scrubbed...
Size: 473 bytes
Desc: OpenPGP digital signature
More information about the dhcp-users