Force isc-dhcpd to disregard client hostname in ddns updatesSome clients aren't updating using dhcpd's...
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Force isc-dhcpd to disregard client hostname in ddns updates
Some clients aren't updating using dhcpd's “ddns-update-style interim” with Windows dns serversISC-DHCPD failover, Modifying host definitions via OMAPIDDNS Not Creating Journal (Dhcpd and Named)When does ISC dhcpd expire leasesdhcpd not pushing ddns updates to bindddns correct setting for dhcpd.conf and ifcfg file with regards to hostnameISC DHCP server not dynamically updating DNSISC DHCPD class is not assigneddhcpd rewrite invalid client hostname for ddnsWhy would ISC dhcpd ignore vendor options?
I have the following configuration of isc-dhcpd-4.3.1:
ignore client-updates;
ddns-update-style interim;
subnet 192.168.128.0 netmask 255.255.255.0 {
use-host-decl-names on;
update-static-leases on;
key "rndc-key" {
algorithm hmac-md5;
secret "redacted";
};
zone example.com. {
primary 127.0.0.1;
key rndc-key;
}
zone 128.168.192.in-addr.arpa. {
primary 127.0.0.1;
key rndc-key;
}
authoritative;
range 192.168.128.32 192.168.128.63;
next-server 192.168.128.1;
option domain-name "example.com";
option domain-name-servers 192.168.128.1;
group {
host test {
hardware ethernet 00:00:00:00:00:00;
}
}}
What is happening is that despite the ignore client-updates, the ddns entries created are defaulting to the server's hostname at the time of the dhcp query, ie: localhost.example.com. The server, after it's initial dhcp query correctly sets its hostname to test.example.com and a service networking restart will then have the correct DDNS entries created.
I am at a complete loss as to why dhcpd is listening to the client sending a hostname of localhost despite the setting telling it not to.
Some assistance with this would be great.
networking dhcp linux-networking dhcp-server isc-dhcp
asked Feb 16 '16 at 9:54
md_5md_5
336211
bumped to the homepage by Community♦ 8 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have the following configuration of isc-dhcpd-4.3.1:
ignore client-updates;
ddns-update-style interim;
subnet 192.168.128.0 netmask 255.255.255.0 {
use-host-decl-names on;
update-static-leases on;
key "rndc-key" {
algorithm hmac-md5;
secret "redacted";
};
zone example.com. {
primary 127.0.0.1;
key rndc-key;
}
zone 128.168.192.in-addr.arpa. {
primary 127.0.0.1;
key rndc-key;
}
authoritative;
range 192.168.128.32 192.168.128.63;
next-server 192.168.128.1;
option domain-name "example.com";
option domain-name-servers 192.168.128.1;
group {
host test {
hardware ethernet 00:00:00:00:00:00;
}
}}
What is happening is that despite the ignore client-updates, the ddns entries created are defaulting to the server's hostname at the time of the dhcp query, ie: localhost.example.com. The server, after it's initial dhcp query correctly sets its hostname to test.example.com and a service networking restart will then have the correct DDNS entries created.
I am at a complete loss as to why dhcpd is listening to the client sending a hostname of localhost despite the setting telling it not to.
Some assistance with this would be great.
networking dhcp linux-networking dhcp-server isc-dhcp
asked Feb 16 '16 at 9:54
md_5md_5
336211
bumped to the homepage by Community♦ 8 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
I have the following configuration of isc-dhcpd-4.3.1:
ignore client-updates;
ddns-update-style interim;
subnet 192.168.128.0 netmask 255.255.255.0 {
use-host-decl-names on;
update-static-leases on;
key "rndc-key" {
algorithm hmac-md5;
secret "redacted";
};
zone example.com. {
primary 127.0.0.1;
key rndc-key;
}
zone 128.168.192.in-addr.arpa. {
primary 127.0.0.1;
key rndc-key;
}
authoritative;
range 192.168.128.32 192.168.128.63;
next-server 192.168.128.1;
option domain-name "example.com";
option domain-name-servers 192.168.128.1;
group {
host test {
hardware ethernet 00:00:00:00:00:00;
}
}}
What is happening is that despite the ignore client-updates, the ddns entries created are defaulting to the server's hostname at the time of the dhcp query, ie: localhost.example.com. The server, after it's initial dhcp query correctly sets its hostname to test.example.com and a service networking restart will then have the correct DDNS entries created.
I am at a complete loss as to why dhcpd is listening to the client sending a hostname of localhost despite the setting telling it not to.
Some assistance with this would be great.
networking dhcp linux-networking dhcp-server isc-dhcp
asked Feb 16 '16 at 9:54
md_5md_5
336211
I have the following configuration of isc-dhcpd-4.3.1:
ignore client-updates;
ddns-update-style interim;
subnet 192.168.128.0 netmask 255.255.255.0 {
use-host-decl-names on;
update-static-leases on;
key "rndc-key" {
algorithm hmac-md5;
secret "redacted";
};
zone example.com. {
primary 127.0.0.1;
key rndc-key;
}
zone 128.168.192.in-addr.arpa. {
primary 127.0.0.1;
key rndc-key;
}
authoritative;
range 192.168.128.32 192.168.128.63;
next-server 192.168.128.1;
option domain-name "example.com";
option domain-name-servers 192.168.128.1;
group {
host test {
hardware ethernet 00:00:00:00:00:00;
}
}}
What is happening is that despite the ignore client-updates, the ddns entries created are defaulting to the server's hostname at the time of the dhcp query, ie: localhost.example.com. The server, after it's initial dhcp query correctly sets its hostname to test.example.com and a service networking restart will then have the correct DDNS entries created.
I am at a complete loss as to why dhcpd is listening to the client sending a hostname of localhost despite the setting telling it not to.
Some assistance with this would be great.
networking dhcp linux-networking dhcp-server isc-dhcp
networking dhcp linux-networking dhcp-server isc-dhcp
asked Feb 16 '16 at 9:54
md_5md_5
336211
asked Feb 16 '16 at 9:54
md_5md_5
336211
asked Feb 16 '16 at 9:54
md_5md_5
336211
asked Feb 16 '16 at 9:54
md_5md_5
336211
asked Feb 16 '16 at 9:54
md_5md_5
336211
336211
bumped to the homepage by Community♦ 8 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
bumped to the homepage by Community♦ 8 mins ago
This question has answers that may be good or bad; the system has marked it active so that they can be reviewed.
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
I had the same problem and came up with the solution to add ddns-hostname to the host config.
use-host-decl-names neither ignore client-updates change any behavior of the dhcpd.
The following function worked finally, even tho clients still tried to update the dns with their hostname:
host client.foo.bar {
hardware ethernet 00:00:00:00:00:AA;
fixed-address 192.168.42.2;
ddns-hostname "foo";
}
If you find a better solution please let me know!
answered Dec 28 '16 at 0:36
pausiertpausiert
11
add a comment |
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1 Answer
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I had the same problem and came up with the solution to add ddns-hostname to the host config.
use-host-decl-names neither ignore client-updates change any behavior of the dhcpd.
The following function worked finally, even tho clients still tried to update the dns with their hostname:
host client.foo.bar {
hardware ethernet 00:00:00:00:00:AA;
fixed-address 192.168.42.2;
ddns-hostname "foo";
}
If you find a better solution please let me know!
answered Dec 28 '16 at 0:36
pausiertpausiert
11
add a comment |
I had the same problem and came up with the solution to add ddns-hostname to the host config.
use-host-decl-names neither ignore client-updates change any behavior of the dhcpd.
The following function worked finally, even tho clients still tried to update the dns with their hostname:
host client.foo.bar {
hardware ethernet 00:00:00:00:00:AA;
fixed-address 192.168.42.2;
ddns-hostname "foo";
}
If you find a better solution please let me know!
answered Dec 28 '16 at 0:36
pausiertpausiert
11
add a comment |
I had the same problem and came up with the solution to add ddns-hostname to the host config.
use-host-decl-names neither ignore client-updates change any behavior of the dhcpd.
The following function worked finally, even tho clients still tried to update the dns with their hostname:
host client.foo.bar {
hardware ethernet 00:00:00:00:00:AA;
fixed-address 192.168.42.2;
ddns-hostname "foo";
}
If you find a better solution please let me know!
answered Dec 28 '16 at 0:36
pausiertpausiert
11
I had the same problem and came up with the solution to add ddns-hostname to the host config.
use-host-decl-names neither ignore client-updates change any behavior of the dhcpd.
The following function worked finally, even tho clients still tried to update the dns with their hostname:
host client.foo.bar {
hardware ethernet 00:00:00:00:00:AA;
fixed-address 192.168.42.2;
ddns-hostname "foo";
}
If you find a better solution please let me know!
answered Dec 28 '16 at 0:36
pausiertpausiert
11
answered Dec 28 '16 at 0:36
pausiertpausiert
11
answered Dec 28 '16 at 0:36
pausiertpausiert
11
answered Dec 28 '16 at 0:36
pausiertpausiert
11
11
add a comment |
add a comment |
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