Case Study: How Null route is used to avoid routing loop


WORKING:

19 2020-09-15 13:05:01.326805699 10.15.41.z 10.15.6.172 / (10.15.6.z) ICMP 109 Echo (ping) request id=0x0001, seq=2414/28169, ttl=119 (reply in 20)

Ethernet II, Src: Fortinet_09:00:24 (00:09:0f:09:00:24), Dst: 5a:ad:21:e2:04:39 (5a:ad:21:e2:04:39)

20 2020-09-15 13:05:01.326808868 10.15.6.172 10.15.41.z ICMP 109 Echo (ping) reply id=0x0001, seq=2414/28169, ttl=255 (request in 19)

Ethernet II, Src: 5a:ad:21:e2:04:39 (5a:ad:21:e2:04:39), Dst: Fortinet_09:00:24 (00:09:0f:09:00:24)

NON-WORKING:

21 2020-09-15 13:05:04.132236026 10.15.41.z 10.15.6.z ICMP 109 Echo (ping) request id=0x0001, seq=2415/28425, ttl=119 (no response found!)

Ethernet II, Src: Fortinet_09:00:24 (00:09:0f:09:00:24), Dst: 5a:ad:21:e2:04:39 (5a:ad:21:e2:04:39)

22 2020-09-15 13:05:04.132239438 10.15.41.z 10.15.6.z ICMP 109 Echo (ping) request id=0x0001, seq=2415/28425, ttl=118 (no response found!)

Ethernet II, Src: 5a:ad:21:e2:04:39 (5a:ad:21:e2:04:39), Dst: Fortinet_09:00:24 (00:09:0f:09:00:24)

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