TCP length value is more than negotiated MSS

asked 2024-10-14 21:25:28 +0000

Hello,

In my capture, mss value is 947 and 1460. so negotiated value is 947. But during file transfer, I see manu packets' tcp length more than 947. Could you please comment why this is happening?

regards,

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@MahmutAydin I reopened the question, changed the comments to an answer stream and accepted that answer. This way the question and answer remain visible for others to learn from.

SYN-bit ( 2024-10-16 05:02:43 +0000 )edit

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answered 2024-10-14 21:58:54 +0000

Chuckc
2983 ●6 ●606 ●20

Is the network interface configured for Offloading?
The frames may be the correct size on the wire but reassembled into larger packets before being passed to Wireshark.

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This device is F5. By default F5 is enabled for TSO. But I think it is capturing on CPU, so not directly from nic.

MahmutAydin ( 2024-10-14 23:22:15 +0000 )edit

https://blog.securityonion.net/2011/1...

Anders ( 2024-10-15 06:40:05 +0000 )edit

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Asked: 2024-10-14 21:25:28 +0000

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Last updated: Oct 14

TCP length value is more than negotiated MSS edit

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