Re: ICMP on port 3

[Brad Arlt <arlt () cpsc ucalgary ca>]

On Fri, Dec 06, 2002 at 09:08:33AM +0100, emmanuel.siegel () ota fr socgen com wrote:
> Hi
>
> i have a strange communication between two of my Linux server, it's ICMP
> packet on port 3.
> Do you know what it could be ?

ICMP doesn't have ports.

ICMP type 3 are IP error messages.  Type 3 code 4 is used as part of
PMTU discovery and should be considered normal.  Search google for
more info.

There is probably something that used UDP/TCP port 3, but its not very
popular.  Port scanning would be my guess in that case.
-----------------------------------------------------------------------
   __o          Bradley Arlt                    Security Team Lead
 _ \<_          arlt () cpsc ucalgary ca                University Of Calgary
(_)/(_)         I should be biking right now.   Computer Science