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VCS Expressway Cluster use 1 public IP with Loadbalancer?

If you build a VCS Expressway cluster with static NAT you normally would need 2 public IP addresses, one for each VCS-E.

Is it also possible to use 1 public IP address instead and use a load balancer to send connection requests to each VCS-E?

                                                       /-> VCS-E-1

SRV  -> public IP -> load balancer

                                                       \-> VCS-E-2

I could not find this in the available doc.

If yes, will Cisco support this type of configuration?

rgds, Geert.

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2 REPLIES
Cisco Employee

VCS Expressway Cluster use 1 public IP with Loadbalancer?

No. Each peer should have it's own public address.

Thanks,

Guy

Re: VCS Expressway Cluster use 1 public IP with Loadbalancer?

Hi,

In addition to what Guy said, to give you more details, that is not possible because of a design matter. When using NAT with VCSe, you must to configure the NAT address on VCS configuration. This NAT address will be used in SIP and H323 headers when VCS is connecting to internet. And that is the point, when VCSe makes an outbound connection, the firewall should do a NAT using the same external address configured on the VCSe, otherwise the connection wont work. Therefore, to have 1 to 1 NAT, you must to have one IP address for each VCS Expressway, because it is impossible to have 1 to 1 NAT with 2 different sources.

You see? I guess this is the point your are missing, you are considering only inbound connectinos, however, you should also consider outbound connections, that is the main point here.

Go ahead and get 2 IP addresses.  =)

Regards

Paulo Souza

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Paulo Souza Was my response helpful? Please rate useful replies and remember to mark any solved questions as "answered".
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