I have configured inside, outside and DMZ on the Palo Alto firewall. The outside interface is configured for Global Protect.
The default gateway of Palo Alto firewall is not reachable. But when we connect to that cable to ASA firewall we are able to ping gateway.
Please help us to troubleshooting the issue.
ParvezAhmad are you specifying the source of your pings as being the OUTSIDE interface of your PA that is facing your default gateway when you're doing your tests?
ping source 184.108.40.206 host 220.127.116.11
Also are you sure the PA firewall isn't blocking the pings? Do you have a policy rule defined that says "allow outside to outside" with App-ID ping?
Also as was previously mentioned if the PA has the same IP as the ASA you're testing with, it makes sense to force a gratuitous ARP to make sure the ARP cache on your default gateway device updates with the PA MAC address instead of the ASA MAC address.
What egearhart says is true. If you "ping host www.yahoo.com" , the default interface chosen is the management interface. If your WAN interface has an IP of 18.104.22.168, use this syntax, ping source 22.214.171.124 host <IP_ADDR_Nexthop_Rtr>. Then check the arp cache on the ethernet port that corresponds to 126.96.36.199. If you do not see an entry for your ISP next hop then they have probably done a static entry for your IP and MAC in the switch. I have no idea why they do this but it is fairly common in the USA.
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