SMC Networks SMCBR21VPN - Manual (Page 154)

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STEP 7.You can choose Data Encryption + Authentication or Authentication
Only to communicate in IPSec Algorithm list:
ENC Algorithm: 3DES/DES/AES/NULL
AUTH Algorithm: MD5/SHA1
Here we select 3DES for ENC Algorithm and MD5 for AUTH Algorithm to
make sure the encapsulation way for data transmission. (Figure11-25)
Figure11-25 IPSec Algorithm Setting
STEP 8.After selecting GROUP1 in Perfect Forward Secrecy, enter 3600
seconds in ISAKMP Lifetime, enter 28800 seconds in IPSec Lifetime, and
selecting Main mode in Mode. (Figure11-26)
Figure11-26 IPSec Perfect Forward Secrecy Setting
STEP 9.Complete the IPSec Autokey setting. (Figure11-27)
Figure11-27 Complete Company B IPSec Autokey Setting