I just got the readme from the sourceforge version from http://sourceforge.net/projects/cyberoam/
and this is what the readme had to say:

Steps:
1. copy client exe to /root folder
2. Be super or Root user
3. do chmod 755 /root/24onlineClient
4. at #prompt type : 24onlineClient -s
1. It will ask you for AskonExit: type y
2. it will ask for AutoLogin: type n
3. it will ask for ShowNotification: type y
4. It will ask for server ip address: type 172.16.0.1 or whatever is 24online server ip address.
5. Then run at # prompt this line : /root/24onlineClient -u username (username means whatever username you have created in 24online GUI) like manager, administrator ..etc
6. It will ask for password. (password is case sensitive) make sure about casename.
7. and Last type Enter. it will login.
8. You can check instance of 24online Client running by command at #ps -ef
9. You can Logout by typing command as #/root/24onlineClient -l

By mod command do you mean chmod? Because that just sets permissions on who can run it, you still need to actually run the program like it says in step 4 and then 5 to get it set up and then login.