Help me! About datagroup

[Triste]

When I add IP to datagroup, I get an error "invalid mask 127.0.0.1 ."。

[Mohamed_Ahmed_Kansoh]

Hi @Triste , 
you are adding a client address not network address. 
Check this KB : https://support.f5.com/csp/article/K38840283 

See both of following snapshots from my Lab : 

Try again

[Triste]

Oh nonono, I added "1.1.1.1/32", which will prompt the error "invalid mask 127.0.0.1."

[Mohamed_Ahmed_Kansoh]

Hi @Triste , 
I added 1.1.1.1/32 and it was added successfully , Look : 

Make sure that you have selected data group from Address type not another type. 

strange for me to give you such this error. 

[Triste]

Oh, thank you. The problem has been solved.

[Mohamed_Ahmed_Kansoh]

@Triste , 
What was the Reason for this issue ? 

[Triste]

Error due to a reserved address for V6.

[Mohamed_Ahmed_Kansoh · Accepted solution]

Okay , that’s great. 
Please mark your Answer " Error due to a reserved address for V6 " as an Accepted Solution to guide any one has the same issue for the future