Wanos as a WAN accelerator is deployed in WAN environments where typically a Firewall might also be found.
In this case the topology would be similar to:
Site 1 Switch
|
Wanos 1
|
ASA/PIX Firewall 1
|
WAN
|
ASA/PIX Firewall 2
|
Wanos 2
|
Site 2 Switch
Wanos uses the TCP option 76 only in SYN and SYN-ACK packets of each TCP connection. This is used for autodiscovery.
Since the Cisco ASA/PIX is a firewall after all, the device might require a specific configuration to permit TCP option 76 for Wanos auto discovery to be operational. This is only needed if the firewall is in the path between Wanos devices.
The following sample configuration can be use on Cisco ASA/PIX version 7.0 or above:
access-list TCP_Option_76 extended permit tcp any any log
tcp-map TCP_Option_76_Tmap
tcp-options range 76 76 allow
class-map TCP_Option_76_Cmap
match access-list TCP_Option_76
policy-map global_policy
class TCP_Option_76_Cmap
set connection advanced-options TCP_Option_76_Tmap
*Note, please post a sample config if you use a different firewall and had to configure a similar policy.