force DDNS update
Carl Karsten
carl at personnelware.com
Mon Apr 23 01:10:47 UTC 2007
My dhcp/ddns setup does almost exactly what I want it to. I think I have one
little kink to work out: when the IP of a box changes, bind doesn't pickup the
change.
If you are wondering: why does the IP change? good Q. I have a few A's:
1. duel boot box, both boots have the same hosthame (perhaps I should change
this) I boot into Win, it sends hostname=foo and gets IP 1.1.1.1. I shut that
down (it does not release the lease on .1) and boot into linux, it sends
hostname=foo and gets IP 1.1.1.2.
2. I move a box from the IP pool to a fixed IP using dhcp.conf
fixed-address 192.168.1.6 ;
3. swap nic, so new mac.
4. magic?
In any event, anytime dhcpd tells bind foo=X, I don't want bind to argue. I
want it to take the new IP and make it so.
the ddns part of /etc/dhcp3/dhcpd.conf:
ddns-updates on;
ddns-update-style interim;
do-forward-updates on;
ddns-domainname "personnelware.com";
ddns-rev-domainname "in-addr.arpa.";
update-static-leases on;
# ddns-ttl 7200;
key DHCP_UPDATER {
algorithm HMAC-MD5.SIG-ALG.REG.INT;
secret ZiO1XpvhIDVLRsvnBk9+Qw==;
};
zone personnelware.com. {
primary localhost;
key DHCP_UPDATER;
}
zone 1.168.192.in-addr.arpa. {
primary localhost;
key DHCP_UPDATER;
}
guessing the only important part of bind.conf:
zone "personnelware.com" {
type master;
file "/etc/bind/personnelware.com.db";
allow-update { key DHCP_UPDATER; };
};
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