Dear,
I cannot configure Reverse RTR Record correctly in my DNS Server. I also cannot find any problem on zone file using “named-checkzone” command. I configured a DNS Server and Postfix Mail Server in a same machine/host. I am using a Public IP Address and my registered domain. My Server OS version is rhel 7.
For SMTP Reverse DNS Resolution problem, my mail is identified as spam and going to spam folder on gmail/yahoomail. How can I solve these below problem:
1. SMTP Reverse DNS Resolution - No PTR Record found
2. error (network unreachable) resolving…. (showing is in log)
Please help……….
Domain Name:
www.example.com
Mail Server IP: 122.X.X.102
DNS and Mail Server Hostname: mail.example.com
# cat /etc/sysconfig/network-scripts/ifcfg-enp2s0
Quote:
IPADDR0=122.X.X.102
PREFIX0=26
GATEWAY0=122.X.X.65
DNS1=122.X.X.102
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# cat /etc/resolv.conf
Quote:
search example.com
nameserver 122.X.X.102
|
# cat /etc/hosts
Quote:
|
122.X.X.102 mail.example.com mail
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This is the named.config file:
# vim /etc/named.conf
Quote:
options {
listen-on port 53 { 127.0.0.1; 122.X.X.102; };
#l isten-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query { any; };
zone "mail.example.com" IN {
type master;
file "fwd-example.zone";
allow-update { none; };
};
zone "X.X.122.in-addr.arpa" IN {
type master;
file "rev-example.zone";
allow-update { none; };
};
include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";
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This is the forward zone file:
# vim /var/named/fwd-example.zone
Quote:
$TTL 1D
@ IN SOA mail.example.com. admin.example.com. (
3 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
IN NS mail.example.com.
IN A 122.X.X.102
mail IN A 122.X.X.102
IN MX 10 mail.example.com.
|
This is the reverse zone file:
# vim /var/named/rev-example.zone
Quote:
$TTL 1D
@ IN SOA mail.example.com. admin.example.com. (
3 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
IN NS mail.example.com.
IN A 122.X.X.102
102 IN PTR mail.example.com.
|
LOG:
Quote:
Jan 15 16:48:59 mail systemd: Starting Berkeley Internet Name Domain (DNS)...
Jan 15 16:48:59 mail named-checkconf: zone mail.example.com/IN: loaded serial 0
Jan 15 16:48:59 mail named-checkconf: zone X.X.122.in-addr.arpa/IN: loaded serial 0
Jan 15 16:48:59 mail named[4722]: starting BIND 9.9.4-RedHat-9.9.4-14.el7 -u named
.
.
.
.
Jan 15 16:48:59 mail named[4722]: listening on IPv4 interface lo, 127.0.0.1#53
Jan 15 16:48:59 mail named[4722]: listening on IPv4 interface enp2s0, 122.X.X.102#53
Jan 15 16:48:59 mail named[4722]: generating session key for dynamic DNS
Jan 15 16:48:59 mail named[4722]: sizing zone task pool based on 3 zones
Jan 15 16:48:59 mail named[4722]: using built-in DLV key for view _default
Jan 15 16:48:59 mail named[4722]: set up managed keys zone for view _default, file '/var/named/dynamic/managed-keys.bind'
Jan 15 16:48:59 mail named[4722]: automatic empty zone: 10.IN-ADDR.ARPA
Jan 15 16:48:59 mail named[4722]: automatic empty zone: 16.172.IN-ADDR.ARPA
Jan 15 16:48:59 mail named[4722]: automatic empty zone: 17.172.IN-ADDR.ARPA
Jan 15 16:48:59 mail named[4722]: automatic empty zone: 18.172.IN-ADDR.ARPA
.
.
.
Jan 15 16:48:59 mail named[4722]: managed-keys-zone: loaded serial 1458
Jan 15 16:48:59 mail named[4722]: zone X.X.122.in-addr.arpa/IN: loaded serial 0
Jan 15 16:48:59 mail named[4722]: zone mail.example.com/IN: loaded serial 0
Jan 15 16:48:59 mail named[4722]: all zones loaded
Jan 15 16:48:59 mail named[4722]: running
Jan 15 16:48:59 mail systemd: Started Berkeley Internet Name Domain (DNS).
Jan 15 16:48:59 mail systemd: Starting Telnet Server...
Jan 15 16:48:59 mail systemd: Started Telnet Server.
Jan 15 16:48:59 mail named[4722]: error (network unreachable) resolving '52.146.191.201.in-addr.arpa/PTR/IN': 2001:67c:e0::1#53
Jan 15 16:49:00 mail named[4722]: error (network unreachable) resolving 'ns2.lacnic.net/A/IN': 2001:13c7:7002:3000::10#53
Jan 15 16:49:00 mail named[4722]: error (network unreachable) resolving 'ns2.lacnic.net/A/IN': 2001:dc0:1:0:4777::140#53
Jan 15 16:49:00 mail named[4722]: error (network unreachable) resolving 'ns2.lacnic.net/A/IN': 2001:13c7:7002:3000::11#53
Jan 15 16:49:00 mail named[4722]: error (network unreachable) resolving 'ns3.afrinic.net/AAAA/IN': 2001:dc0:2001:a:4608::59#53
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