Internernal view is answering to external ping

[IT Support]

Hi brothers

I have running bind9 on debian, with master zone for mydomain.com i 
created internal view for resolve names on my lan, and external zone for 
resolve my host on Internet, this is the working scenario

Internal view
LAN IP 192.168.0.67
Hostname sales.mydomain.com

External view
WAN IP 200.57.66.77
Hostname sales.mydomain.com

When I make a ping from a other Internet access I get the answer from 
internal View

Pinging sales.mydomain.com [192.168.0.67] with 32 bytes o

Ping statistics for 192.168.0.67
     Packets: Sent = 3, Received = 3, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
     Minimum = 0ms, Maximum = 2ms, Average = 1ms

Is it possible to change this issue?

Thanks in advance.

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