External SMTP server Post: 302937203

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Operating Systems Linux Red Hat External SMTP server Post 302937203 by Duffs22 on Wednesday 4th of March 2015 07:31:53 AM

03-04-2015

Registered User

External SMTP server

Hi,

We current use an email/hosted exchange server (provided by 3rd party company).

Our production DNS (RH5) server has got the MX rec configured for this 3rd party mail relay server. So in order to resolve hostnames to send outbound mails an A record entry is also required on the external DNS server based on individual servers public IP adddress (in order to relay mails outbound).

The following concern has been raised re security:
- Having public addresses on a public DNS; servers are advertised publically therefore security risk.

In my opinion the production servers are located in the DMZ and so no internet facing IP can traverse onto the LAN without hitting the DMZ.

With the outbound connection configured on the external fw to only allow certain IP address to connect to a certain destination address - so this should remove any risk, as no one would see it.

Question: Would it be better practice to create our own SMTP server and have one public IP address presented to the external DNS server or is this an unnecessary overkill?

...interested in your thoughts/opinions on this.

Regards,
D.

Duffs22

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LEARN ABOUT MOJAVE

net::dns::rr::eui645.18

Net::DNS::RR::EUI64(3)					User Contributed Perl Documentation				    Net::DNS::RR::EUI64(3)

NAME

       Net::DNS::RR::EUI64 - DNS EUI64 resource record

SYNOPSIS

	   use Net::DNS;
	   $rr = new Net::DNS::RR('name IN EUI64 address');

	   $rr = new Net::DNS::RR(
	       name    => 'example.com',
	       type    => 'EUI64',
	       address => '00-00-5e-ef-10-00-00-2a'
	       );

DESCRIPTION

       DNS resource records for 64-bit Extended Unique Identifier (EUI64).

       The EUI64 resource record is used to represent IEEE Extended Unique Identifiers used in various layer-2 networks, ethernet for example.

       EUI64 addresses SHOULD NOT be published in the public DNS.  RFC7043 describes potentially severe privacy implications resulting from
       indiscriminate publication of link-layer addresses in the DNS.

METHODS

       The available methods are those inherited from the base class augmented by the type-specific methods defined in this package.

       Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or
       other unpredictable behaviour.

   address The address field is a 8-octet layer-2 address in network byte order.
       The presentation format is hexadecimal separated by "-".

COPYRIGHT

       Copyright (c)2013 Dick Franks.

       All rights reserved.

       This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

       Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

SEE ALSO

       perl, Net::DNS, Net::DNS::RR, RFC7043

perl v5.18.2							    2014-01-16						    Net::DNS::RR::EUI64(3)

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