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Expressway C & E Single NIC Help

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Beginner

Cisco Recommends Dual NIC deployment for Expressways. But single NIC deployment can be achieved.

 

Points to be noted for single NIC:

 

> Firewall must support NAT Reflection, if not then you can use dual NATing to achieve NAT reflection on unsupported firewall like Fortigate.

> If you're geolocation doesn't support PSTN calls over internet then you need to block them through Device Mobility.

> Need to resolve SRV's.

The DNS configuration should be:

externaldomain.com on the external:

resolving only the Expressway-E.

externaldomain.com on the Internal:

Resolving only the CUCM & IM&P servers.

If you still have more queries feel free to comment.

1 Comment
VIP Advocate

Hi,

For Singl NIC development you will need an advance network license for Cisco Express E. And second mistake you had made as:

 

externaldomain.com on the Internal. It is wrong.

 

you need as internaldomain.com on the internal.

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