ZyXEL Communications P-202 - Manual (Page 176)

P-202H Plus v2 Support Notes
See the screen shot:
8. Select VPN, then click the right button of the mouse, and choose
connection Properties.... Setup IPSec parameters as shown below. Note
that the parameters you set here should match settings in P-202H Plus v2.
In IKE Advanced Settings, Encryption Algorithm is 56-bit DES,
Authentication Algorithm is MD5 and the SA lifetime is 1 hr. In IPSec
Transform, Encryption Algorithm is 56-bit DES, Authentication
Algorithm is MD5, and SA lifetime is 1 hr.
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