Hello I have read "How to Configure Dual ISP Network with GlobalProtect VPN using a Virtual Router and Policy-Based Forwarding" (https://knowledgebase.paloaltonetworks.com/KCSArticleDetail?id=kA10g000000ClJeCAK) since we had exactly the same challenge a few days ago. I solved it using a second virtual router. If I follow the setup as shown in the HowTo, which ISP is chosen for an reply packet coming in via ISP2? The users PC (to be more precise the GP software) is connecting to the firewalls IP of ISP2, traffic coming in via line of ISP2. Due to having only one default route, I expect that the reply to the PC is sent back via ISP1.
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