Ping Packets dropped: forwarded to different zone

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Ping Packets dropped: forwarded to different zone

L1 Bithead


1. All the units in above diagram are AWS EC2s. Pinging from Ubuntu10_20_61_16

    to Ubuntu10_60_0_100 failed due to echo reply dropped on PA-VM.


admin@PA-VM> show counter global filter packet-filter yes delta yes severity drop

Global counters:

Elapsed time since last sampling: 1.16  seconds

name                                   value     rate severity  category  aspect    description


flow_fwd_zonechange    1      0 drop      flow      forward   Packets dropped: forwarded to different zone


Total counters shown: 1


2. Following is the routing info.


admin@PA-VM> show routing route

flags: A:active, ?:loose, C:connect, H:host, S:static, ~:internal, R:rip, O:ospf, B:bgp,

       Oi:ospf intra-area, Oo:ospf inter-area, O1:ospf ext-type-1, O2:ospf ext-type-2, E:ecmp, M:multicast

VIRTUAL ROUTER: vr1 (id 1)


destination                                 nexthop                                 metric flags      age   interface          next-AS                                                       10     A S              ethernet1/1                                              0      A C              ethernet1/1                                                    0      A H                                            0      A C              ethernet1/2                                                  0      A H                                                       10     A S              tunnel.1

total routes shown: 6


3. Following is the Zones info



4. Following is the security policies info. 



5. From the log below, we can see when ping from to it is from Pub-zone to VPN zone. ping packet goes from e1/2 to e1/1, then e1/1 goes to tunnel.1. But seems ping reply didn't take path, tunnel.1-->e1/1--->e1/2.



admin@PA-VM> test routing fib-lookup ip virtual-router vr1

runtime route lookup
virtual-router: vr1
interface ethernet1/2, source

6. Guess ping reply didn't  go the right path. So got "Packets dropped: forwarded to different zone".

7. There is no NAT rules on PA-VM.

How to fix this issue? Thanks for sharing your thoughts!


L1 Bithead


This the first topology previous post didn't show correctly.

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