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Start off by creating new Phase 1 profile and Phase 2 proposal entries using stronger or weaker encryption parameters that suits your needs. It is advised to create separate entries for each menu so that they are unique for each peer in case it is necessary to adjust any of the settings in the future. These parameters must match between the sites or else the connection will not establish.
/ip ipsec profile add dh-group=modp2048 enc-algorithm=aes-128 name=ike1-site2 /ip ipsec proposal add enc-algorithms=aes-128-cbc name=ike1-site2 pfs-group=modp2048