There are two ports on the bridge card in the upper-right corner of the back of the appliance.
Immediately to the left of these is a small group of six LEDs that indicate LAN connection status,
as described in the "Appliance Hardware" page. Of the two RJ45 ports on this card, the one to
the left is the WAN port, which you connect to your firewall for WAN or internet access ; the
port to the right is the LAN port , which you connect to your LAN.
All outbound and inbound traffic passes through the Web Appliance, which filters all port 80 and
443 traffic, allowing only secure and permissable web content to be accessed by your users, while
non-web network traffic is passed through.
If the Web Appliance shuts down, the bridge card will be shut down with the LAN circuit closed,
meaning that all LAN traffic will pass through.
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All outbound network traffic passes through the Web Appliance . Users’ URL requests
are intercepted by the Web Appliance on their way to the firewall . All other traffic passes
through.
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The Web Appliance assesses all URL requests, blocks disallowed requests, checks if
allowed URL requests are currently cached and passes uncached URL requests through the
firewall and retrieves them from the internet .
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The Web Appliance receives any new pages or files and caches them; it passes the pages
or files of allowed requests back to the users .
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The users receive only safe and allowed pages and files or a notification page.
32 | Getting Started | Sophos Web Appliance
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