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Looking for a tool that can determine TCP settings of a server.

I was just evaluating whether to enable SACK and thought I might like to check what others are doing, but couldn't figure out a way.

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  • Too generic. You can do that with netstat if you want Dec 15, 2021 at 9:02
  • @FrancescoMantovani If that works, great. How do I use netstat to determine if, say, the stackexchange.com server can use SACK?
    – Paul
    Dec 15, 2021 at 12:55

1 Answer 1

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I see, you are looking for the SACK Panic vulnerability.

In this case you can use:

  • Wireshark: through this guide
  • tcpdump: through this command tcpdump -i eth0 -n 'ip[8]<65 and tcp[13]&0x2f=2' | grep 'sackOK'

Next time for security questions post on https://security.stackexchange.com/

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  • Thank you. I hadn't got that far as I was just initially curious to see what others are doing.
    – Paul
    Dec 15, 2021 at 23:27

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