I appreciate your help. about MTU: I visited some web sites including the wikipedia. I do not think I understood everything correctly about MTU. I did not customize MTU. MTU must be default setting. I think MTU is automatically set. Anyway,I typed, ifconfig eth0 MTU 1500 and tried to browse www.google.com , but the page can not be accessed. about other Google pages: www.google.co.jp :server can not be found www.google.co.nz :server can not be found www.google.com :server can not be found I get the same result.
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(Formatted by MHonArc.)