we have waas in my new company, we use wccp on the router.
Can anyone explain simply how my traffic will be optimized? will my waas appliance not be an inline appliance, does the traffic flow to the appliance then back to the router? how will the physical connections and traffic flow look? and how does the wccp work ?
the idea is that we should configure WCCP on the router and the WAAS appliance first take care of that analisys before addressing the traffic from your clients.
things to keep in mind when configuring WCCP:
- will the WAAS device be L2 connected to the Router or there will be devices in between the two of them? ( L3 connected) this is very important to understand what type of WCCP design works the best on your network.
for example if I had a swith directly connected to my WAAS box I will definelty use WCCP L2 redirection which incurs in less CPU utilization.
if I had a Router directly connected to the WAAS box I will be probably force to use WCCP software redirection which is more CPU utilization.
please review the following WCCP and WAAAS design guide:
1- it does not matter if you have WCCP and an inline mode on each site of your network, you can use either one or even PBR but I see it more difficult to manage than WCCP or inline mode.
2- there is what we called " WAAS 3 way handshake" basically what it means is that WAAS needs to know that there is another WAAS appliance at the other site of the network and vicersa.
3- how does the WAAS handshake works, that is where your traffic comes into play
remote client is trying to access his email, let's suppose that all your email exchange servers are at the Data Center on the other site of the client's network.
so that initial request comes from the remote client to Remote Router, WCCP will redirect the traffic coming from the "LAN" interface to the WAAS remote appliance , WAAS will just add a "Hello field" to the client email request.
then WCCP/WAAS remote appliance will just return the traffic back to the router and the router send it out to his "WAN" interface
once the packet cross the cloud and gets to the Data Center the same way the Core Router will redirect the remote client request to the WAAS appliance ( as I said either inline or WCCP) and then WAAS will know that there is another WAAS appliance at the other site.
at the core site is the same way WAAS will return the traffic back to the router and then the final destination the email server.
once the traffic comes back it should follow the same path ( no asynchronous paths!!!) and that is how WAAS starts adding optimization to your traffic.
this is explain on my own words and I hope I can address some of your doubst let me know if you have any specific questions.
so there are two processes in here, the one that explain already which is how WAAS discovery itself ( "hello packets and "here I am" response ) and now I need to mention the WAAS "tcp options" which is basically telling what type of acceleration is being apply to the traffic, this needs to happen to every new connection for WAAS to be able to apply optimization to the traffic.
in the case of asymmetric routing or firewalls in between blocking WAAS tcp options there will be issues with WAAS not doing any optimization, but the traffic will still be routed to the client and the server, remember that WAAS redirection methods are transparent to the applications and traffic.
here are some posts that talk about the WAAS initial handshake, firewalls and TCP options in a more formal way.
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