Hi! The host is running up to two VirtualBox instances with the IP addresses 8X.2X.32.197 and .195 Both VMs are running BIRD 1.3.11 with OSPFv2. When I use OSPFv3 on all neighbors the trouble is more bigger ("LSA disappeared" messages). The server with IP .211 running BIRD 1.3.11. All OSPF neighbors have a Cisco IOS based OSPF neighbor with OSPFv2 and OSPFv3. I hope this are enough information about my environment. Formerly the servers working with Quagga and I have not any issues with ARP and OSPF. Interface "re0" has two VLANs. VLAN2 has multiple IPs in the same network. --- Host .211 --- re0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=820db<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,POLLING,VLAN_HWCSUM,WOL_MAGIC,LINKSTATE> ether f4:6d:04:94:0c:30 inet6 fe80::f66d:4ff:fe94:c30%re0 prefixlen 64 scopeid 0x3 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active fxp0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=2049<RXCSUM,VLAN_MTU,POLLING,WOL_MAGIC> ether 00:90:27:8f:d6:08 inet6 fe80::290:27ff:fe8f:d608%fxp0 prefixlen 64 scopeid 0x4 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (none) status: no carrier plip0: flags=8810<POINTOPOINT,SIMPLEX,MULTICAST> metric 0 mtu 1500 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> ipfw0: flags=8801<UP,SIMPLEX,MULTICAST> metric 0 mtu 65536 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384 options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6> inet6 2001:XXXX:1002:1002::1 prefixlen 128 inet6 ::1 prefixlen 128 inet6 fe80::1%lo0 prefixlen 64 scopeid 0x8 inet 127.0.0.1 netmask 0xff000000 inet 10.255.255.10 netmask 0xffffffff nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> vlan2: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=3<RXCSUM,TXCSUM> ether f4:6d:04:94:0c:30 inet6 fe80::f66d:4ff:fe94:c30%vlan2 prefixlen 64 scopeid 0x9 inet 8X.2X.32.210 netmask 0xffffffe0 broadcast 82.2X.32.223 inet6 2001:XXXX:1002:1::2 prefixlen 48 inet 8X.2X.32.216 netmask 0xffffffe0 broadcast 8X.2X.32.223 inet 8X.2X.32.217 netmask 0xffffffe0 broadcast 8X.2X.32.223 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active vlan: 2 parent interface: re0 vlan3: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500 options=3<RXCSUM,TXCSUM> ether f4:6d:04:94:0c:30 inet6 fe80::f66d:4ff:fe94:c30%vlan3 prefixlen 64 scopeid 0xa inet 8X.2X.1.33 netmask 0xfffffffc broadcast 8X.2X.1.35 inet 10.8X.2X.193 netmask 0xffffffc0 broadcast 10.8X.2X.255 nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL> media: Ethernet autoselect (1000baseT <full-duplex>) status: active vlan: 3 parent interface: re0 ### All loaded kernel modules (has BIRD trouble with the vbox drivers?) $ kldstat Id Refs Address Size Name 1 48 0xffffffff80200000 135c780 kernel 2 1 0xffffffff8155d000 3008 splash_bmp.ko 3 1 0xffffffff817a1000 4f18 if_gre.ko 4 1 0xffffffff817a6000 77d0 if_tap.ko 5 1 0xffffffff817ae000 f7a8 if_lagg.ko 6 1 0xffffffff817be000 b468 ng_netflow.ko 7 4 0xffffffff817ca000 15330 netgraph.ko 8 1 0xffffffff817e0000 f4d8 aio.ko 9 1 0xffffffff817f0000 a80 accf_data.ko 10 1 0xffffffff817f1000 17d8 accf_http.ko 11 1 0xffffffff817f4000 1a5c0 pefs.ko 12 3 0xffffffff8180f000 2b4a8 crypto.ko 13 2 0xffffffff8183b000 dde0 zlib.ko 14 1 0xffffffff81849000 4a30 aesni.ko 15 1 0xffffffff8184e000 2970 snp.ko 16 3 0xffffffff81851000 59a60 vboxdrv.ko 17 1 0xffffffff81a12000 13436d zfs.ko 18 1 0xffffffff81b47000 2fb1 opensolaris.ko 19 1 0xffffffff81b4a000 a9bb fuse.ko 20 2 0xffffffff81b55000 2b11 vboxnetflt.ko 21 1 0xffffffff81b58000 1579 ng_ether.ko 22 1 0xffffffff81b5a000 3fea vboxnetadp.ko ### Additional options in my custom kernel. All other options are from the GENERIC file. options IPFIREWALL options IPFIREWALL_VERBOSE options IPFIREWALL_VERBOSE_LIMIT=0 options IPFIREWALL_DEFAULT_TO_ACCEPT options IPDIVERT options IPFIREWALL_FORWARD options IPFIREWALL_NAT options LIBALIAS options DUMMYNET options ROUTETABLES=2 // Configured but not used in production. options DEVICE_POLLING options HZ=1000 Best regards, Markus