Saturday, October 16, 2021

Why do OSPF packets not arrive?

I am new to OSPF and multicast. I have two machines in the same L2 net (first one Linux box with bird, second one Mikrotik running RouterOS OSPF).

On station 1 I can see the OSPF Hello messages with tcpdump. But they never arrive at Station 2.

On station 2 I can see the OSPF messages as well. But they never arrive at Station 1.

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Ping et.al. works flawlessly. No packet filter on Linux box. On Mikrotik, ospf unconditionally allowed as first rule (number of packets matched: 0).

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Do I miss anything with multicast?



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