Re: Classifying incoming vs outgoing HTTP traffic

Traffic distend to a web server

Source port = random

Distention port = 80

Traffic coming from a web server

Source port = 80

Destination port = random

It will reply to the same client source port

HTH

Salah

On Thu, Apr 2, 2009 at 9:38 PM, naveen M S <navin.ms_at_gmail.com> wrote:

> Thanks Divin. This is my understanding.
>
> WebClient---------------------------------WebServer
>
> 1) For Traffic flowing from Client to Server:
> Src TCP port = Any
> Dest TCP port = 80
>
> 2) For traffic flowing from Server to Client:
> Src TCP port = 80
> Dest TCP port = 80
>
> Is this correct ?
>
>
> On Thu, Apr 2, 2009 at 11:19 AM, Divin Mathew John <divinjohn_at_gmail.com
> >wrote:
>
> > I think destination Port would be more APT.! becoz to connect to a normal
> > HTTP webserver u wud use port 80 to connect to web server and not
> > necessarily POrt 80 on your comp.!
> > Thanking You
> >
> > Yours Sincerely
> >
> > Divin Mathew John
> > divinjohn_at_gmail.com
> > divin_at_dide3d.com
> > +91 9945430983
> > +91 9846697191
> > +974 5008916
> > PGP PUBLIC KEY BLOCK @ http://www.dide3d.com/divin_Public_PGP_key.txt
> > Sent from Bangalore, KA, India
> >
> > On Thu, Apr 2, 2009 at 11:44 PM, naveen M S <navin.ms_at_gmail.com> wrote:
> >
> >> Group,
> >>
> >> I have trouble translating these statements to ACLs.
> >>
> >> 1) All HTTP traffic coming from Vlan 34.
> >> 2) All HTTP traffic coming from R1 on Vlan 34.
> >> 3) All HTTP traffic coming from Web Server on Vlan 34.
> >> 4) All HTTP traffic going out to Vlan 34.
> >> 5) All HTTP traffic going out to Web Server on Vlan 34.
> >>
> >> *Question is:*
> >> Should I match both Source and Destination TCP port to 80 (or) just one
> of
> >> them ?
> >> Assume Vlan 34 = 10.1.34.0/24, R1 = 10.1.34.1/24, WebServer =
> >> 10.1.34.100/24
> >>
> >> My solutions is for the above are:
> >>
> >> a) Match source tcp port = 80 for incoming HTTP traffic
> >> b) Match destination tcp port = 80 for outgoing HTTP traffic.
> >>
> >> 1) ip access-list extended V34_in
> >> permit tcp 10.1.34.0 0.0.0.255 eq www any
> >>
> >> 2) ip access-list extended V34_R1_in
> >> permit tcp 10.1.34.1 0.0.0.0 eq www any
> >>
> >> 3) ip access-list extended V34_WS_in
> >> permit tcp 10.1.30.100 0.0.0.0 eq www any
> >>
> >> 4) ip access-list extended V34_out
> >> permit tcp any 10.1.30.0 0.0.0.255 eq www
> >>
> >> 5) ip access-list extended V34_WS_out
> >> permit tcp any 10.1.30.100 0.0.0.0 eq www
> >>
> >> Can someone please highlight the Source & Destination TCP ports for HTTP
> >> traffic in both directions ?
> >>
> >> Thanks very much,
> >> Naveen.
> >>
> >>
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Received on Thu Apr 02 2009 - 21:53:10 ART