08-01-2015 09:01 PM
Ipv6 on outgoing mail?
I'm getting mail delivery failures to a company that is using ipv6. I'm completely ipv4 internally and on the firewall. But the bounce back messages (soft fail) refer to an ipv6 address. Do I need a ptr for the Comcast ipv6, or can I get it turned off?
08-02-2015 02:17 PM
Re: Ipv6 on outgoing mail?
All Comcast Gateways (CGs) run in dual stack mode IPV4 and IPV6. All CGs IPV6 can be disabled to stop all IPV6 processing if the network is only using IPV4 no problem.