Re: BAD TRAFFIC bad frag bits

[Jeff Nathan <jeff () snort org>]

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One situation this occurs in is Linux Path MTU discovery.

See:
http://kerneltrap.org/node.php?id=579

- -Jeff

- --On Thursday, March 27, 2003 15:41 -0800 Clayton Mascarenhas 
<masclaythesnort () yahoo com> wrote:

> Hi list,
>
>
>
> I got this "Bad traffic bad frag bits" alert.
>
>
>
> 03/20-01:00:09.476681 [**] [1:1322:4] BAD TRAFFIC bad frag bits [**]
> [Classification: Misc activity] [Priority: 3] {UDP} 2.3.4.5 -> 1.2.3.4
>
>
>
> This comes when the Dont Fragment and More fragment bits are set. When
> will this situation occur?? In the alert shown what could possibly make
> the 2.3.4.5 machine send such a packet to 1.2.3.4? And why would an
> attacker want to craft such a packet when it actually doesnt help the
> attacker in any way?
>
>
>
> Thanks in advance.
>
>
>
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- --
http://cerberus.sourcefire.com/~jeff       (gpg key available)
"Great spirits have always encountered violent opposition from mediocre
minds."
- - Albert Einstein
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