Daniel B. Thurman wrote:
I have several DNS servers and wondered if the following
record entry is properly set for all of my DNS servers:
$TTL 172800
@ IN SOA ns1.abc.com. admin.abc.com. (
1 ; serial
3H ; refresh
15M ; retry
1W ; expiry
1D ) ; minimum
;============ Nameserver ================
@ IN NS ns1.abc.com.
@ IN NS ns2.abc.com.
@ IN NS ns3.abc.com.
;============ Mail Exchange =============
@ IN MX 10 mail1.abc.com.
@ IN MX 20 mail2.abc.com.
@ IN MX 30 mail3.abc.com.
@ IN TXT v=spf1 a mx -all
;============ Hosts ======================
@ IN A 10.1.0.1
mail1 IN A 10.1.0.1
mail2 IN A 10.1.0.2
mail3 IN A 10.1.0.3
ns1 IN A 10.1.0.1
ns2 IN A 10.1.0.2
ns3 IN A 10.1.0.2
;========================================
In particular, I am focusing on record:
@ IN A 10.1.0.1
The reason I have set all of my DNS zones for the above record
for all of my DNS servers is because if had I set this record for the
actual localhost IP address, it appears that if I send mail on the
localhost, the localhost would receive the email I sent. For example,
sending mail to: joe@xxxxxxx would be received at the localhost instead
of being sent to mail{1,2,3}.abc.com. Worse, any localhost programs
attempting to send emails to "root@xxxxxxx" would fail to be delivered
to one of the MX list.
So, the question is, must each DNS server have it's own real IP address
in the '@' record? If so, how do I get around this?
Kind regards,
Dan
Dan,
do you have any other services with the network address 10.1.0.1 which
you want to refer to as 'abc.com'? If not you do not need the 'A' record
just after the Hosts line. Otherwise for a simple internal network this
look reasonable. However, do you not have any other hosts you need to
address? If so the you need their 'A' records.
Howard.
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