[Snort-users] Re: portscans from 255.255.255.255?

Sam Evans sam at ...5202...
Thu Jan 30 13:02:06 EST 2003


FWIW, we too have been seeing an increase in scans like this. 

twig les writes: 

> Hey all, I have seriously debated whether I should
> send this since it may or may not be off-topic; it's
> just too bizarre to tell.  My border routers are
> sysloging this: 
> 
> bdr-acl-in denied tcp 255.255.255.255(80) ->
> 1.1.156.194(8118) 
> 
> The acl is named correctly - these hits are coming
> from the outside.  They hit random IPs in our range
> like NMAP, and they always target a high port coming
> from 80.  I would assume they are from a LAN upstream
> since only routers doing stupid things forward
> broadcasts.  The implications of this coming from our
> upstream provider are quite large since we peer via
> dual /30s. 
> 
> It isn't crucial to my security (we don't let those
> shenanigans in the border), but does snort see this as
> bad traffic?  I did a quick "grep 255.255.255.255 *"
> in the snortrules dir and only came up with a couple
> of snmp rules.  I would like to know if I should write
> a rule for this since I only caught this by accident
> this time. 
> 
> 
> =====
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