On 1/07/20 11:20 am, Bill Cole wrote:
Can't you just fix the DNS? Use a HELO name that resolves to both
IPs and give both IPs PTR records that point back to the name you
use.
On 02.07.20 11:37, Peter wrote:
This won't work for FCRDNS properly. What happens is the lookup on
the A record will randomly return either one or the other IP address
as is appropriate for multiple DNS records as this is how round-robin
DNS works. So half of the time it will return the correct IP address
for the interface that you're on at the time and the other half it
will return the wrong IP address causing FCRDNS to fail.
This is not how DNS works. When you have multiple A records for a name, DNS
returns all of them. For correct FcrDNS one of them has to match the IP.
...unless you have some load balancer configured to only return one record
for a name. But in that case, you did break it yourself.
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