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Linus_Espach
Participant
‎2019-10-23 11:38 PM

Sequence Number in Log does not match per connection

HI 2 All,

 

I have a case, where a connection passes several firewalls until its final destination. I can see the Connection within the log on all 3 (FW) hops.

Because it is the same segment, I was expecting the same sequence number within the logs on all 3 FWs. Unfortunately it is not the same number.

The sequence number is increasing.

 

Any hints what could be the reason for this?

 

Best regards

 

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3 Replies
PhoneBoy
Admin
Admin
‎2019-10-26 04:57 PM

It is increasing by one, a random number, or?
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Linus_Espach
Participant
‎2019-12-11 02:17 AM
In response to PhoneBoy

Hi @PhoneBoy ,

it is increasing by a random number, so it looks like different segments...

Best regards

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Matthias_Haas
Advisor
‎2019-12-11 04:15 AM
In response to Linus_Espach

Initial Sequence Number (ISN) Spoofing (IPS Signature) is not enabled ?

Matthias

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