我最初在 LinuxQuestions 上发布了这篇文章http://www.linuxquestions.org/questions/linux-server-73/dhcp-is-mangling-my-ptr-records-in-dns-4175412344/没有太多运气，所以我会在这里尝试。
DHCP 在添加 PTR 记录时会重复前三个八位字节。从我的消息日志中：
dhcpd: added reverse map from 10.2.168.192.2.168.192.in-addr.arpa to FTIR.Adherent.lab
我确信这是像错过月经这样的愚蠢的事情，但我还没能弄清楚。
这在 192.168.2.xyz 和 192.168.4.xyz 网络上都会发生。
请注意，FTIR 计算机已存在于 hosts 和 ptr 文件中，但仍会添加新条目。此外，在我的配置文件中，没有任何地方有大写字母 A 的 Adherent，但大写版本显示在混乱的文件中。
我的 DHCP/BIND 服务器是 Ubuntu Linux，但所有网络计算机都是 Windows。以下是我的系统信息：
$ uname -a
Linux ATI-DHCP.adherent.lan 2.6.32-41-server #90-Ubuntu SMP Tue May 22 12:41:40 UTC 2012 x86_64 GNU/Linux
$ lsb_release -a
Distributor ID: Ubuntu
Description: Ubuntu 10.04.4 LTS
Release: 10.04
Codename: lucid
$ named -v
BIND 9.7.0-P1
以下是我的各种配置文件：
dhcpd.conf：
ddns-update-style interim;
ddns-updates on;
authoritative;
log-facility local1;
default-lease-time 86400;
max-lease-time 259200;
include "/etc/dhcp3/ddns.key";
# Adherent internal network with internet access
zone adherent.lan. {
primary 192.168.1.201;
key ddns;
}
# Reverse zone for 192.168.1.xyz
zone 1.168.192.in-addr.arpa. {
primary 192.168.1.201;
key ddns;
}
# Adherent insecure network-NO internet access
zone lab.adherent.lan. {
primary 192.168.2.201;
key ddns;
}
# Reverse zone for 192.168.2.xyz
zone 2.168.192.in-addr.arpa. {
primary 192.168.2.201;
key ddns;
}
# Guest-Internet only
zone guest.adherent.lan. {
primary 192.168.4.201;
key ddns;
}
# Reverse zone for 192.168.4.xyz
zone 4.168.192.in-addr.arpa. {
primary 192.168.4.201;
key ddns;
}
# ATI shared network: Internal (192.168.1.xyz) and visitor (192.168.4.xyz) nets
shared-network ATIshared {
# ATI internal
subnet 192.168.1.0 netmask 255.255.255.0 {
#range 192.168.1.10 192.168.1.19;
deny unknown-clients;
ddns-domainname "adherent.lan";
ddns-rev-domainname "1.168.192.in-addr.arpa";
option domain-name "adherent.lan";
option routers 192.168.1.201;
option domain-name-servers 192.168.1.201;
}
# Visitor subnet
subnet 192.168.4.0 netmask 255.255.255.0 {
default-lease-time 3600;
range 192.168.4.40 192.168.4.49;
allow unknown-clients;
ddns-domainname "guest.adherent.lan";
ddns-rev-domainname "4.168.192.in-addr.arpa";
option domain-name "guest.adherent.lan";
option routers 192.168.4.201;
option domain-name-servers 192.168.4.201;
}
}
# Adherent insecure network-NO internet access (192.168.2.xyz)
subnet 192.168.2.0 netmask 255.255.255.0 {
range 192.168.2.240 192.168.2.250;
ddns-domainname "lab.adherent.lan";
ddns-rev-domainname "2.168.192.in-addr.arpa";
option domain-name "lab.adherent.lan";
option routers 192.168.2.101;
option domain-name-servers 192.168.2.201;
}
include "/etc/dhcp3/hosts.dhcp3";
命名的.conf.本地
include "/etc/bind/zones.rfc1918";
include "/etc/bind/ddns.key";
###########################################################
# Adherent main zone.
# All addresses are fixed and from 192.168.1.0/24
# If DHCP doesn't have an entry for a computer, it gets put in the guest zone.
#
zone "adherent.lan" {
type master;
file "/var/lib/bind/adherent.lan.hosts";
allow-update { key ddns ;};
};
zone "1.168.192.in-addr.arpa" {
type master;
file "/var/lib/bind/192.168.1.rev";
allow-update { key ddns ;};
};
###########################################################
# Adherent lab zone.
# All addresses are from 192.168.2.0/24
# Doesn't matter if DHCP has an entry for the computer.
zone "lab.adherent.lan" {
type master;
file "/var/lib/bind/adherent-lab.lan.hosts";
allow-update { key ddns ;};
};
zone "2.168.192.in-addr.arpa" {
type master;
file "/var/lib/bind/192.168.2.rev";
allow-update { key ddns ;};
};
###########################################################
# Adherent guest zone.
# All addresses are from 192.168.4.0/24
# If DHCP doesn't have an entry for a computer, it gets put in this zone.
#
zone "guest.adherent.lan" {
type master;
file "/var/lib/bind/adherent-guest.lan.hosts";
allow-update { key ddns ;};
};
zone "4.168.192.in-addr.arpa" {
type master;
file "/var/lib/bind/192.168.4.rev";
allow-update { key ddns ;};
};
文件 /var/lib/bind/adherent-lab.lan.hosts
$ttl 3h
@ IN SOA ATI-DHCP.adherent.lan. bgordon.adherent-tech.com. (
2012061801 ; serial
3h ; Refresh
1h ; Retry
1w ; Expire
1h ; Minimum
)
@ IN NS ATI-DHCP.adherent.lan.
FTIR IN A 192.168.2.10
GCMS IN A 192.168.2.12
datalogg IN A 192.168.2.13
TA IN A 192.168.2.14
instron IN A 192.168.2.20
instron2 IN A 192.168.2.21
文件/var/lib/bind/192.168.2.rev
$TTL 3h
@ IN SOA ATI-DHCP.adherent.lan. bgordon.adherent-tech.com. (
2012061801 ; serial
3h ; refresh (3 hours)
1h ; retry (1 hour)
1w ; expire (1 week)
1h ; minimum (1 hour)
)
@ NS ATI-DHCP.adherent.lan.
10 PTR FTIR.lab.adherent.lan.
12 PTR GCMS.lab.adherent.lan.
13 PTR datalogg.lab.adherent.lan.
14 PTR TA.lab.adherent.lan.
20 PTR instron.lab.adherent.lan.
21 PTR instron2.lab.adherent.lan.
经过修改后的同一文件（所有更改均由 DHCP/BIND 进行）：
$ORIGIN .
$TTL 10800 ; 3 hours
2.168.192.in-addr.arpa IN SOA ATI-DHCP.adherent.lan. bgordon.adherent-tech.com. (
2012061802 ; serial
10800 ; refresh (3 hours)
3600 ; retry (1 hour)
604800 ; expire (1 week)
3600 ; minimum (1 hour)
)
NS ATI-DHCP.adherent.lan.
$ORIGIN 2.168.192.in-addr.arpa.
10 PTR FTIR.lab.adherent.lan.
12 PTR GCMS.lab.adherent.lan.
13 PTR datalogg.lab.adherent.lan.
14 PTR TA.lab.adherent.lan.
$TTL 43200 ; 12 hours
10.2.168.192 PTR FTIR.Adherent.lab.
$TTL 10800 ; 3 hours
20 PTR instron.lab.adherent.lan.
21 PTR instron2.lab.adherent.lan.
答案1
我在 LinuxQuestions 上的原始帖子中得到了答案。dhcp.conf 中针对每个子网定义的行如下：
ddns-rev-domainname "1.168.192.in-addr.arpa";
ddns-rev-domainname "2.168.192.in-addr.arpa";
ddns-rev-domainname "4.168.192.in-addr.arpa";
都应该是：
ddns-rev-domainname "in-addr.arpa.";
我不确定 arpa 后面的点是否是必需的，但它在那里可以起作用。