Heads Up :
The post you are writing will appear in a public forum. Please ensure all content is appropriate for public consumption. Review the employee guidelines for the community here.
Not sure this is the correct forum for this question.
Is there any documentation or hints on configuring a Meraki MX firewall to support an Expressway-E Dual Nic configuration to have it talk to the outside and to the Expressway-C on the inside?
Typical deployment is LAN1 connected to "Transit DMZ" separated by firewall between internal network, including Exp-C server and LAN2 connected to "Services DMZ" which is either using public addresses (rarely) or doing static NAT (most common). As a side note NATing on LAN1 (transit DMZ) is not supported.
For port usage you can refer to the following link:
As far as Expressway is concerned you may refer to the following for Dual NIC configuration on Expressway E:
http://www.cisco.com/c/en/us/support/docs/unified-communications/expressway-series/117811-configure-vcs-00.html#anc14
Typical deployment is LAN1 connected to "Transit DMZ" separated by firewall between internal network, including Exp-C server and LAN2 connected to "Services DMZ" which is either using public addresses (rarely) or doing static NAT (most common). As a side note NATing on LAN1 (transit DMZ) is not supported.
For port usage you can refer to the following link:
http://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-1/Cisco-Expressway-IP-Port-Usage-for-Firewall-Traversal-Deployment_Guide-X8-1.pdf
If you are specifically looking for Meraki Firewall Configuration only then you can post this question in firewall forum.