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DNS proxy can not be used because it opened MCE function

Publication Date:  2012-09-14 Views:  296 Downloads:  0
Issue Description
USG deployed as MCE to access to MPLSVPN network, internal network communication and external network communication are all normal. But put client PC DNS turn into USG internal network port, and start DNS proxy on the USG at the same time, there will appear can not use domain name to visit web page. Visit website fixed IP can visit normally. PING domain name unsuccessful. PING website and PING external network successfully. 
Alarm Information
Handling Process
The internal network computer DNE direct use external network normally. If use USG to do DNS, the DNS function abnormality. By ACK, it is product function issue: If USG deployed as MCE, the DNC PROXY function failure.
Root Cause
1 Check USG DNS configuration --------- normal
2.Check USG packet filtering ----------- normal
3.Check MCE configuration -------------normal
4.USG PING external network domain name -------normal
5.Suspect in is DNS proxy function issue
V100R005 version has all the functions.