Encapsulation is a poor form of security as there is no encryption. The ideal thing would be to form an IPSec btn 2 1841s(they are desgined for those) and route your LANs to the PIX . This is secure. Else you can do PIX-to-PIX IPSec. AFAIK PIX doesntsupport GRE only allows GRE packets through it
HTH
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