Removing incorrect ddns info from lease
Frank Price
fprice at lexmark.com
Tue Nov 17 16:47:21 UTC 2015
Hi dhcp-users,
Internet Systems Consortium DHCP Server 4.2.5
IND 9.9.4-RedHat-9.9.4-18.el7_1.1 (Extended Support Version)
dhcpd failover
I'm struggling with some of my clients occasionally losing their ddns
entries, or not having them updated. In an effort to fix things up, I want
to remove DHCID info from the lease. The dhcpd.conf man page tells me
"data can be removed from the lease through operator intervention," but is
light on details:
In addition to these differences, the server also does not update very
> aggressively. Because each DNS update involves a round trip to the DNS
> server, there is a cost associated with doing updates even if they do not
> actually modify the DNS database. So the DHCP server tracks whether or not
> it has updated the record in the past (this information is stored on the
> lease) and does not attempt to update records that it thinks it has
> already updated.
>
> This can lead to cases where the DHCP server adds a record, and then the
> record is deleted through some other mechanism, but the server never again
> updates the DNS because it thinks the data is already there. In this case
> the data can be removed from the lease through operator intervention, and
> once this has been done, the DNS will be updated the next time the client
> renews.
Here's one of the leases in question:
lease 10.199.128.49 {
starts 1 2015/11/16 21:31:22;
ends 2 2015/11/17 21:31:22;
tstp 3 2015/11/18 09:31:22;
tsfp 3 2015/11/18 09:31:22;
atsfp 3 2015/11/18 09:31:22;
cltt 1 2015/11/16 21:31:22;
binding state active;
next binding state expired;
hardware ethernet f8:bc:12:3f:69:90;
uid "\001\370\274\022?i\220";
set ddns-rev-name = "49.128.999.10.in-addr.arpa.";
set ddns-txt = "31cce6d6ea09aa5603b3d319af3022007a";
set ddns-fwd-name = "yocto023.yocto.rds.bigco.com";
client-hostname "yocto023";
}
Intuition says it's one of the ddns-* options, but my intuition often
sucks.
1. What information should I remove from the lease?
2. Is there a recommended way to do this that doesn't involve manually
editing the leases file?
Thanks as always for any help you can provide,
-Frank
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