Hello. I am application developer for MDM on android.
I would like to ask some question for firewall setting for GCM push server..
My product provide MDM functions on android smart phone by using GCM push 
service for sending message from MDM server to MDM client(smart phone).
Recently, My customer want to working MDM service under their VPN. 
They want to block almost internet service except their intranet and at 
least site.
So they use VPN to access from smart phone to their intranet directly.

Now we have faced some problem. 
MDM messages are not transferred from MDM server to MDM client because of 
VPN. When I did test without VPN, the MDM message is received by MDM 
client. 
I have already added IP range,"74.125.235.160 ~ 74.125.235.175 for Inbound" 
as VPN setting to bypass some message from GCM server. But it is not 
working. So I want to know the IP ranges for GCM server. 

I have already read "http://developer.android.com/google/gcm/gcm.html";. 
In this page, there is some guide how to set the firewall to use GCM push 
service as like below sentence.
In the below sentence, they suggested some guide by link page on "this 
support link". But this is not working.
the url of linked page is 
"http://support.google.com/code/bin/answer.py?hl=en&answer=62464";.

*Note:* If your organization has a firewall that restricts the traffic to 
or from the Internet, you'll need to configure it to allow connectivity 
with GCM. The ports to open are: 5228, 5229, and 5230. GCM typically only 
uses 5228, but it sometimes uses 5229 and 5230. GCM doesn't provide 
specific IPs. It changes IPs frequently. We recommend against using ACLs 
but if you must use them, take a broad approach such as the method 
suggested in this support 
link<http://support.google.com/code/bin/answer.py?hl=en&answer=62464>
.

is there anyone to provide some clue for solving this problem?

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