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# iSNS Preferences
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These are the preferences that control how Wireshark dissects the [iSNS](/iSNS) protocol.
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![isns\_preferences.jpg](uploads/__moin_import__/attachments/iSNS_Preferences/isns_preferences.jpg "isns_preferences.jpg")
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## Desegment iSNS over TCP messages
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When you activate this preference, Wireshark will attempt to reassembly all [iSNS](/iSNS) PDUs that span multiple TCP segments into one fully reassembled PDU.
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This is useful for example if a specific implementation only sends the [iSNS](/iSNS) header and the actual [iSNS](/iSNS) command in two separate packets or with servers that respond with massively large replies.
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In order to make this preference take effect, you must also enable reassembly in [TCP\_Reassembly](/TCP_Reassembly).
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\-- someone should donate a capture with isns segments spanning multiple segments and link to it as an example from here.
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## Preference Strings
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Desegment iSNS over TCP messages
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## Discussion
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We should sometime later add support to defragment iSNS PDUs that are fragmented at the iSNS layer as well.
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---
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Imported from https://wiki.wireshark.org/iSNS_Preferences on 2020-08-11 23:15:27 UTC |