From: Muhabat Khan (muhabat@gmail.com)
Date: Fri Nov 21 2008 - 17:57:10 ARST
As BGP behavior is client/Server model and selection of server (in BGP)
depends upon IP address so adding BGP port 179 in both directions will be a
good decision.
my two cents.......
On Thu, Nov 20, 2008 at 8:00 PM, What ever <gfy.ccie@gmail.com> wrote:
> " ...BGP needs tcp port 179 both for source and destination
> ... "
> Not quite correct.
>
>
> The side initiating connects with a destination port of 179. Response
> traffic to the side that initiated has a source port of 179, and a
> destination port above 1024.
>
> A to B
> S: A.A.A.A:xxxx
> D: B.B.B.B:179
>
> B to A
> S: B.B.B.B:179
> D: A.A.A.A:xxxx
> On Wed, Nov 19, 2008 at 5:21 PM, Darby Weaver <ccie.weaver@gmail.com>
> wrote:
>
> > Check out Jeff Doyle Volume I 2nd Edition in one of his Appendices. He
> > covers this little misunderstood topic very well. I think he used Telnet
> > or
> > SSH in his example through.
> >
> > The jist of the discussion is to understand what a "source port" is and
> > what
> > a "destination port" is. Once you have this (debug ip packet if you
> need
> > further clarification) then you can correctly write your access list
> every
> > time.
> >
> > For example: BGP needs tcp port 179 both for source and destination.
> > While
> > http only has a destination port of 80 on the other hand. Look at
> netstat
> > to verify on a Windows on *Nix box to verify.
>
>
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