Avatar of Albert Widjaja
Albert Widjaja
Flag for Australia asked on

Exchange Server Send connector and DNS Round Robin ?

Hi All,

If I create two different IP address (A) record for the Linux appliance in my internal DNS server and then make it the same name like below:

External AD-Integrated DNS server:
mail.domain.com (A Record) 202.43.252.167 Default TTL 1 hr.
mail.domain.com (A Record) 202.43.252.91 Default TTL 1 hr.

Internal AD-Integrated DNS server:
mail.domain.com (A Record) 10.1.1.100 Default TTL 1 hr.
mail.domain.com (A Record) 10.1.11.113 Default TTL 1 hr.

PRODMAIL01-VA.domain.com (A Record) 10.1.1.100
PRODMAIL02-VA.domain.com (A Record) 10.1.11.113

Would that configuration works for the Exchange Server 2013 Send Connector resiliency if I just put mail.domain.com ?

So if I need to perform maintenance or upgrade on the Virtual appliance, I can just delete the (A) record and then retype it again once it is done, without causing any email queue or blockage.

My assumption is that the TTL in the public DNS can be reduced to just 1 minute to expedite the process when the email is queued during the appliance maintenance.

Any help and comment would be greatly appreciated.
LinuxExchangeEmail ServersDNSActive Directory

Avatar of undefined
Last Comment
Albert Widjaja

8/22/2022 - Mon
Chris Dent

it doesn't, by itself, offer resiliency. If an attempt to send leads to one A record, and that fails, the mail service will not try the other one.

If you're going to pull / push records as and when you need (and with awareness of the TTLs) them it'll be fine.
Albert Widjaja

ASKER
OK, so how to make it resilient by using DNS round robin ?
SOLUTION
Chris Dent

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
GET A PERSONALIZED SOLUTION
Ask your own question & get feedback from real experts
Find out why thousands trust the EE community with their toughest problems.
Albert Widjaja

ASKER
Chris, so in my case here it would be better off just to use each appliance IP address (A) record than the mail.domain com ?
Your help has saved me hundreds of hours of internet surfing.
fblack61
ASKER CERTIFIED SOLUTION
Chris Dent

THIS SOLUTION ONLY AVAILABLE TO MEMBERS.
View this solution by signing up for a free trial.
Members can start a 7-Day free trial and enjoy unlimited access to the platform.
See Pricing Options
Start Free Trial
⚡ FREE TRIAL OFFER
Try out a week of full access for free.
Find out why thousands trust the EE community with their toughest problems.
Albert Widjaja

ASKER
Thanks, Chris.

So I assume that I leave the both IP address like the two lines above, then Exchange will intelligently pick which one is up.