Re: Snort rule question

[Brian <bmc () snort org>]

On Thu, Jun 26, 2003 at 06:37:06AM -0600, James Lay wrote:
> So ok....trying to catch those naughty spammers using:
>
> alert tcp $SMTP_SERVERS 25 -> $EXTERNAL_NET any (msg:"Open Mail Relay Attempt"; content:"Relay access denied"; 
> classtype:mail-abuse; sid:1000001; rev:1;)
>
> Now the above rule works.  I originally had:
>
> alert tcp $EXTERNAL_NET any <- $SMTP_SERVERS 25 (msg:"Open Mail Relay Attempt"; content:"Relay access denied"; 
> classtype:mail-abuse; sid:1000001; rev:1;)

You shouldn't use <- anymore.  It has been depriciated.  You should
rewrite your rules.

-b


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