It simply means the sender supports selective acknowledgements.
From: wireshark-users-bounces@xxxxxxxxxxxxx [mailto:wireshark-users-bounces@xxxxxxxxxxxxx]
On Behalf Of Derrenbacker, L. Jonathan
Sent: Monday, July 16, 2012 4:31 PM
To: 'wireshark-users@xxxxxxxxxxxxx'
Subject: [Wireshark-users] SACK_PERM=1
I’m doing a packet capture of a web app not authenticating correctly and I see some TCP packets with the “SACK_PERM=1” option set.
Can anyone explain what that option does.
Thanks,
Jon
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