Rockwell Automation Publication 5069-UM002A-EN-P - January 2019 153
Connect to Different EtherNet/IP Network Levels Chapter 6
DNS Request Generated From Port A1 or Port A2
• If port B1 is enabled and the DNS server address is in local subnet of
port B1, DNS requests leave through B1 port.
• If the DNS server address is in the local subnet of port A1 or A2, DNS
requests leave through the respective port.
For example, if the DNS server address is in the local subnet of port A1,
DNS requests leave through port A1.
• If port B1 is enabled and the DNS server address is outside of all local
subnets, DNS requests leave through B1 port towards port B1 default
gateway.
• If port B1 is disabled and the DNS server address is outside of all local
subnets, DNS requests leave through port A1 towards port A1 default
gateway.
SMTP Server
The SMTP server is only available via the enterprise port. Therefore, emails
can only be sent on the enterprise port.
For more information on how to send emails via an Ethernet port, see the
EtherNet/IP Network Configuration User Manual, publication
ENET-UM001.
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