Question on ACLs and TCP/UDP ports
Victor -
For NTP, it is easy - the source and destination ports are the same - udp/123
:-)
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Victor Cappuccio Sent: Montag, 14. August 2006 01:18 To: ‘Edouard Zorrilla’; ’sabrina pittarel’; ‘Group Study (E-mail)’ Subject: RE: Question on ACLs and TCP/UDP ports
I have my personal opinion about a server listening and sending
For example:
The NIST servers listen for a NTP request on port 123, and respond by sending a udp/ip data packet in the NTP format. The data packet includes a 64-bit timestamp containing the time in UTC seconds since January 1, 1900 with a resolution of 200 ps.
Or a well Known application routing Protocol like RIPv2, sends and listens in UDP 520 right?
But for the question, is an Application Sending at That X UDP Port to a Server, just like Edouard states
—–Mensaje original—– De: nobody@groupstudy.com [mailto:nobody@groupstudy.com] En nombre de Edouard Zorrilla Enviado el: Domingo, 13 de Agosto de 2006 06:34 p.m. Para: sabrina pittarel; Group Study (E-mail) Asunto: Re: Question on ACLs and TCP/UDP ports
If client, destination port. If server, It is as a listening state, it does not send any, it receive data.
HIH —– Original Message —– From: “sabrina pittarel” To: “Group Study (E-mail)” Sent: Sunday, August 13, 2006 5:20 PM Subject: Question on ACLs and TCP/UDP ports
> Hi all, > when I’m told that an application send traffic using > UDP port X, how should I interpret that? > As a destination or as a source port? > Some time the application runs on a client, sometime > on a server. > My first instict would be to use that information as a > destination port for traffic generated by the client > and as a source port for traffic generated by the > server…but I’m not sure that’s correct. Looking at > many of the solutions in the IEWB it seems like it is > always used as destination port. > > Is there anything in the wording I should pay > attention to? > > > Thanks > Sabrina > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
Category: CCIE Study
