PBFand Default route

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PBFand Default route

L1 Bithead

In our orginazation, we have dual ISP and PAN firewalls. We have configured PBF with ISP 1 and default route for ISP 2


Both ISP interfaces on Pan firewall is same zone called untrust


example :  ethernet 1/11 

                     ethernet 1/11.200 -----  - untrust

                     ethernet 1/11.250 ------ - untrust 


When primary ISP goes down, the traffic is not taking default route. if we configure another zone like untrust1 to second ISP 

 when the PBF fails, traffic will take default route, Is something we need configure here if the both the ISP's are in same zone 






Cyber Elite
Cyber Elite

outbound traffic may be hitting an incorrect NAT rule as the zones are identical, what is the output of "show session id <id>" of a failing session the moment the default route should be used? is the egress interface correct, is the source NAT accurate,...

Tom Piens

L4 Transporter

In PBF have you configured monitoring option ( like this wll give info to firewall that ISP 1 is down use routing table

Firewalldog dot com

Yes as per Roby's comment you need the monitor or PAN will still execute the PBF policy as it does not know your ISP 1 is down.


You could easily test this by putting in a single (test) source IP in the PBF and set a monitor which does not respond, then do a traceroute from the source IP. You should see the route go via ISP2.

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