From: Joe Pinkus (jpinkus@xxxxxxxxx)
Date: Wed Jun 14 2000 - 19:24:56 GMT-3
I never intended to wrongfully accuse Hank of anything. However, I beg to diff
er with the access list that he provided. Has anyone tried this and can verify
that it
will work. I bet that it won't work, this is my point. Access lists for H.323
require a huge hole to be opened, particularly for RTP.
Joe
Kruepke wrote:
> Joe,
>
> I think you are wrongfully accusing Hank. He never implied he taught YOU the
class. He was saying he gave you (or more accurately "us") the list, not the
class.
>
> Keith
>
> ----- Original Message -----
> From: "Joe Pinkus" <jpinkus@cisco.com>
> To: "Hank Leung" <hank1979@hotmail.com>
> Cc: <ccielab@groupstudy.com>
> Sent: Wednesday, June 14, 2000 1:28 PM
> Subject: Re: Lazy VoIP question
>
> Hank,
>
> I don't know where you are getting your information. Look at the ITU specs f
or
> H.323.
>
> H.225 will use TCP port 1720 as well as a port in the range of 11xxx
> H.245 uses TCP ports 11xxx
> RTP is a random choice of ports in the range of 16xxx to 32xxx, the port numb
er
> choosen is not dependent on the number of conversations, it is a complete ran
dom
> choice negotiated between the two endpoints.
>
> Also, I have never had a class taught by you, so please don't imply this in y
our
> email.
>
> Thanks,
> Joe
>
> Hank Leung wrote:
>
> > Hey Joe,
> > H.323 uses RAS H.225 for packetization and synchronization, it also uses
> > H.245 to control communications between DTEs. But the TCP port H.323 uses
> > is TCP 1720. I have a link:
> >
> > http://www.cs.columbia.edu/~hgs/rtp/h323.html
> >
> > You're right about the RTP UDP ports, though. The ENTIRE voice port range
> > is(16384-32767). RTP begins on an even number and RTCP follows on the next
> > odd number, and so on. I remembered the access-list I gave you from a clas
s
> > I taught recently. I guess my range of 16380-16480 works because of our lo
w
> > number of conversations.
> >
> > Best!
> > Hank
> >
> > >I am not sure how this access list would work. H.225 and H.245 will use
> > >TCP
> > >ports 11xxx during the call signaling and setup. RTP will use UDP ports
> > >16384 to 32767.
> > >
> > >Joe
> > >
> > >Hank Leung wrote:
> > >
> > > > Yup. I use these in my configs. Should catch everything.
> > > >
> > > > access-list 101 permit udp any any range 16380 16480
> > > > access-list 101 permit tcp any any eq 1720
> > > >
> > > > Hank
> > > > CCNP-Voice
> > > >
> > > > >From: Jeff Sapiro <jsapiro@wnmail.wndev.att.com>
> > > > >Reply-To: Jeff Sapiro <jsapiro@wnmail.wndev.att.com>
> > > > >To: GroupStudy CCIE <ccielab@groupstudy.com>
> > > > >Subject: Lazy VoIP question
> > > > >Date: Mon, 12 Jun 2000 13:01:48 -0400
> > > > >
> > > > >Does VoIP require tcp/udp ports? I can't find info on this. Which
> > >ports
> > > > >(for firewall considerations)?
> > > > >-Jeff
> > > > >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 08:23:42 GMT-3