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Re: [lwip-users] ACK missing after SYN, strange high Ack Num

From: Jochen Strohbeck
Subject: Re: [lwip-users] ACK missing after SYN, strange high Ack Num
Date: Tue, 31 May 2022 08:39:54 +0200

No ideas?

I still wonder if ACK after SYN is a protocol error or not.
If it is an error, could this be an (probably well known) LWIP problem?

What also puzzles me: according to the info provided in the wireshark
trace, the ACK numbers reported in case of trouble seems not to be pure
random, if it is converted to a hex number it always starts 0xff..... or

For example

200545  139.315584624   TCP     74      [TCP 
Port numbers
reused] 44316 → 80 [SYN] Seq=0 Win=64240 Len=0 MSS=1460 SACK_PERM=1
TSval=1326542459 TSecr=0 WS=128

200546  139.316059194     TCP     60      80 → 
44316 [ACK]
Seq=1 Ack=4279334007 Win=2764 Len=0

hex(4279334007) = '0xff117477'

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