the IOS is incorrect?

[vv00@eazier.com]

Hi every one ,another question .
   now i install the IOS which version is c3640-is-mz.19991126,I have applied a tunnel to the 6bone site,now i can't ping the remote end of tunnel,i think maybe it is because the IOS have some bugs in it,or maybe my network has some problem.
   if someone have some good ideas about it ,pls contact with me ,thank you in advance!
vv00

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