Snort mailing list archives

Re: preprocessor normalize_tcp: ips


From: Jason Wallace <jason.r.wallace () gmail com>
Date: Tue, 10 Jan 2012 09:06:06 -0500

So is it safe to say that this option should not be used in an
environment with a large number of host OSs that use a different
reassembly method?

On Mon, Jan 9, 2012 at 4:31 PM, Russ Combs <rcombs () sourcefire com> wrote:


On Mon, Jan 9, 2012 at 12:18 PM, Jason Wallace <jason.r.wallace () gmail com>
wrote:

Howdy,

The manual states that if you set "preprocessor normalize_tcp: ips"
that the ips option "ensure consistency in retransmitted data (also
forces reassembly policy to "first"). Any segments that can't be
properly reassembled will be dropped." Is this for streams or
fragments?


Streams only.


Also, How does this affect later settings for stream5 and
frag3?  Does it make host specific settings irrelevant?


It only overrides the reassembly policy.


Thx,
Wally


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