Exchange Server 2007 to Exchange Server 2013 SP1

Hi everyone,

I am doing upgrade from Exchange 2007 to Exchange 2013 SP1,

Is it mandatory to disable ipv6 on my Exchange 2007(all roles running of one server)
During Testing i noticed that if i disable ipv6 information store service is getting stopped?

2. Can i upgrade exchange 2007 to Exchange 2013 Sp1, Is SP1 the latest?

3. after decommisoning Exchange 2007, i am going to change my Exchange 2013 Sp1 servers ip.
I would give the same ip which i gave for Exchange 2007,
After changing ip on exchange 2013 do i need to make any changes.