I have a few NASes based on FreeBSD 7.2 and quagga 0.99.14, they all have same configuration with little changes. When I add to network a test server based on FreeBSD 8.0-STABLE with quagga 0.99.15, other servers doesn't receive HELLO packets from him. nas9# tcpdump -i vr0 proto ospf 13:24:04.591907 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:09.594136 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:14.596375 IP 193.62.62.14a> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:19.598678 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:24.600867 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:29.603050 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:34.605322 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:39.607564 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 13:24:44.609799 IP 193.62.62.14> OSPF-ALL.MCAST.NET: OSPFv2, Hello, length 44 Counter of multicast packets on switch port constantly increasing. What the reason of inaccessibility other servers over multicast?