Log Sequence Numbers in Full BackUp and Log Backup My full back-up starts daily at 02:00 AM. It takes about 3 hours.
I also take T-Log back-ups every 15 minutes (at 15,30,45 and 00 hours).
I can verify the LSN sequences of T-log backups when I "restore headeronly".
However, there seem to be a gap between the last LSN of the full backup and the T-log backup taken immediately after backup had started (i.e 02:15)

Below is restore headeronly output from the full backup started at 02:00

FirstLSN: 76583000073086500011
LastLSN: 76595000084143900001

...and this is the restore headeronly output from the log backup started at 02.15

FirstLSN: 76570000086250400001
LastLSN:  76571000009693900001

Shouldn't the last LSN of the full back up and first LSN of log back up be the same?
I compared the LSNs of the log back up taken at 05:15 and 05:00 (when the full back up has finished) but there is no sequence again.
I also checked RESTORE FILELISTONLY of the full backup and CreateLSN, DropLSN of log file is 0.
What is it that I might be missing here?
Thank you.
LastLSN + 1 of the Full database backup will fall in between the FirstLSN and LastLSN of its subsequent transaction log backup.
(http://www.mssqltips.com/sqlservertip/3209/understanding-sql-server-log-sequence-numbers-for-backups/)