Protected traffic is tunneled through the Symantec Web Security Service (WSS).
The egress IP address that is seen by web servers is no longer the egress IP address of my own network.
How do vendors know what IP address our traffic is coming from?
The egress and ingress IP addresses are now consolidated into a single article. Please see https://knowledge.broadcom.com/external/article/167174/web-security-service-wss-ingress-and-egr.html for the list of all the ingress and egress IP addresses.