Here,Mikrotik is using as a NAS and it will with external radius which is connected to Active Directory Server.
In Active Directory,user is created with domain name like : debasish@gispl.in.
From Mikrotik NAS,client will get login page and put his name only without domain name "@gispl.in" but captive portal will send username with domain name.
Please help me how to edit the captive portal to achive this.