ZyXEL Communications P-660R-T1 Support Notes page 142

P-660 series Support Notes
Choose Settings button in Remote endpoint section. Please uncheck the boxes of
"Acquire virtu al IP address" and "Extended authentication".
Tune IKE proposal to Encryption algor ithm as DES, Integrity function as MD5, IKE
mode as main mode, IKE group as MODP 768 (group 1), and IPSec proposal to
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