03-04-2015
It's normal to have the A records of MX records public.
There is an old saying "Security by Obscurity is NOT Security"
So, your goal would be to correctly secure the MX server, not hide it somehow.
This User Gave Thanks to Neo For This Post:
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LEARN ABOUT OSF1
dnskeygen
dnskeygen(1) General Commands Manual dnskeygen(1)
NAME
dnskeygen - Generates public, private, and shared secret keys for DNS Security
SYNOPSIS
/usr/bin/dnskeygen [-DHR] key-size [-zhu] [-p value] [-s value] -n name
OPTIONS
Specifies that the key cannot be used for authentication. Specifies that the key cannot be used for encryption. Generates a DSA/DSS key.
The size (in bytes) must be one of the following values: 512, 576, 640, 704, 768, 832, 896, 960, or 1024. Uses a large exponent for key
generation (RSA only). Generates an HMAC-MD5 key. The size (in bytes) must be between 1 and 512. Generates a Host key for a host or ser-
vice. Specifies the name of the key that you generate. Sets the protocol field value. The default is 2 (E-mail) for Host keys and 3 (DNS
Security) for all others. Generates an RSA key. The size (in bytes) must be between 512 and 4096. Sets the strength value with which this
key signs DNS records. The default is 1 for Zone keys and 0 for all others. Generates a User key for E-mail or another purpose. Generates
a Zone key for DNS validation.
When the dnskeygen command is executed with no options, it generates output containing a list of its options.
DESCRIPTION
Use the dnskeygen utility to generate and maintain keys for DNS Security. The utility can generate public and private keys to authenticate
zone data and shared secret keys to use for Request/Transaction signatures.
RESTRICTIONS
Although the dnskeygen command supports the full range of options offered by the Internet Software Consortium's (ISC) original program, at
this time, the operating system supports only the keys it generates for secure dynamic updates and zone transfers. See bind_manual_setup(7)
and the Network Administration guide for more information about these features.
EXAMPLES
In the following example, an administrator creates a private key for authentication of DNS dynamic updates (the forward slash indicates
line continuation): # dnskeygen -H 1024 -h -c -n pubnet-enterprise_update ** Adding dot to the name to make it fully qualified domain
name** Generating 1024 bit HMAC-MD5 Key for pubnet-enterprise_update.
Generated 1024 bit Key for pubnet-enterprise_update. id=0 alg=157
flags=16897
# ls K* Kpubnet-enterprise_update.+157+00000.key Kpubnet-enterprise_update.+157+00000.private
FILES
The dnskeygen command generates two files in the directory in which it is executed: Public key file. Private key file.
SEE ALSO
Commands: named(8)
Files: named.conf(4)
Others: bind_manual_setup(7)
Network Administration
dnskeygen(1)