Re: A question on ethernet padding

[James Lay <jlay () slave-tothe-box net>]

On 2014-01-23 12:54, Jeremy Hoel wrote:
> I was wondering kind of the same question.. in regards to those new
> ICMP rules.  NetApps doing have any ICMP data, just the main 
> requests,
> but there seems to always be 10 bytes |00| in what wireshark calls
> padding, and I'm curious if I can write the rule around that.
>
> On Thu, Jan 23, 2014 at 4:07 PM, James Lay <jlay () slave-tothe-box net> 
> wrote:
> > Does snort treat ethernet padding as data?  Wireshark shows that I 
> > have
> > 1 byte of data in a packet after my ethernet and ip headers.  My
> > ethernet header, normally 14 bytes, includes 17 bytes of Padding.  
> > Does
> > snort consider the padding as data?  Trying to figure out what 
> > offset
> > and depth to use on this rule.  Hope I'm explaining this 
> > well..thanks
> > all.
> >
> > James

An end around around to NOT see these can be to add dsize:>1; to your 
rule...should nuke out these zero data pings.

James


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