I cannot for the life of me determine what port numbers refer to echo
and echo-reply.
I know they are related for ICMP and I believe one of them is 7, but
what is the other?
I am using a pix asa5520.
Any help would be greatly appreciated!
toureg69@yahoo.com wrote:
> I cannot for the life of me determine what port numbers refer to echo
> and echo-reply.
>
> I know they are related for ICMP
and ICMP doesn't have any port numbers. It only has status codes.
> and I believe one of them is 7, but what is the other?
Well, why don't you simply look into RFC 792 or at Wikipedia, Google it up
or RTFM?
toureg69@yahoo.com wrote:
> I cannot for the life of me determine what port numbers refer to echo
> and echo-reply.
>
> I know they are related for ICMP and I believe one of them is 7, but
> what is the other?
>
> I am using a pix asa5520.
>
> Any help would be greatly appreciated!
>
play around with ping or traceroute and capture the packets,
then you'll see the different answer types.
....here a detailed description:
http://www.spirit.com/Resources/icmp.html
M
toureg69@yahoo.com wrote:
> I cannot for the life of me determine what port numbers refer to echo
> and echo-reply.
That's no real surprise, since ICMP doesn't have ports.
> I know they are related for ICMP and I believe one of them is 7, but
> what is the other?
You believe wrong. ICMP is an IP protocol of its own that has nothing to
do with TCP or UDP.
http://en.wikipedia.org/wiki/Internet_Control_Message_Protoc ol
cu
59cobalt
--
"If a software developer ever believes a rootkit is a necessary part of
their architecture they should go back and re-architect their solution."
--Mark Russinovich
On Tue, 03 Jul 2007, in the Usenet newsgroup comp.security.firewalls, in article
<1183502673.884771.9170@c77g2000hse.googlegroups.com>, toureg69@yahoo.com wrote:
>I cannot for the life of me determine what port numbers refer to echo
>and echo-reply.
As others have posted - ICMP does not have ports. See RFC792 (or RFC0792)
at any search engine. ICMP Echo Request is a Type 8 Code 0, and the reply
will be a Type 0 Code 0.
0792 Internet Control Message Protocol. J. Postel. September 1981.
(Format: TXT=30404 bytes) (Obsoletes RFC0777) (Updated by RFC0950,
RFC4884) (Also STD0005) (Status: STANDARD)
See also http://www.iana.org/assignments/icmp-parameters
>I know they are related for ICMP and I believe one of them is 7, but
>what is the other?
http://www.iana.org/assignments/port-numbers
echo 7/tcp Echo
echo 7/udp Echo
Notice these are TCP and/or UDP, and not ICMP. This is a different service,
0862 Echo Protocol. J. Postel. May 1983. (Format: TXT=1237 bytes)
(Also STD0020) (Status: STANDARD)
but when microsoft invented IP networking 13 years after everyone else,
they didn't bother to implement this service - they have a habit of not
bothering to follow existing standards. This isn't a big deal, as this
service isn't required by RFC1122 (while the ICMP version _is_ required).
1122 Requirements for Internet Hosts - Communication Layers. R.
Braden, Ed.. October 1989. (Format: TXT=295992 bytes) (Updated by
RFC1349, RFC4379) (Also STD0003) (Status: STANDARD)
As only a few operating systems include the TCP and UDP Echo service, you
will rarely see packets for port 7 - mainly from skript kiddiez who haven't
learned how to read yet.
Old guy
Moe Trin
> On Tue, 03 Jul 2007, toureg69@yahoo.com wrote:
>> I know they are related for ICMP and I believe one of them is 7, but
>> what is the other?
>
> http://www.iana.org/assignments/port-numbers
>
> echo 7/tcp Echo
> echo 7/udp Echo
>
> Notice these are TCP and/or UDP, and not ICMP. This is a different
> service,
>
> 0862 Echo Protocol. J. Postel. May 1983. (Format: TXT=1237 bytes)
> (Also STD0020) (Status: STANDARD)
>
> but when microsoft invented IP networking 13 years after everyone
> else, they didn't bother to implement this service
Oh, but they did. However, it's only available with the server versions,
and it's not installed by default (you need to install the Simple TCP/IP
services).
cu
59cobalt
--
"If a software developer ever believes a rootkit is a necessary part of
their architecture they should go back and re-architect their solution."
--Mark Russinovich