<html><span style="font-family:arial,helvetica,sans-serif; font-size:12px"></span><span style="font-family:arial; font-size:small"><span style="font-family:arial,helvetica,sans-serif; font-size:12px">Hi,<br /><br />sorry for my late answer. I was very busy last days. Yes, i configured non-broadcast because i don't want to have multicast inside my wireguard links. Is it possibble to have bouth, fast hello intervall and non-broadcast?<br /><br />Here are the requestet outputs of ip ospf interface and tcpdump. </span><br /><br />output of "show ip ospf interface" when connection is up<br /><br />wg1 is up<br /> ifindex 9, MTU 1420 bytes, BW 0 Mbit <UP,POINTOPOINT,RUNNING,NOARP><br /> Internet Address 10.36.101.1/30, Broadcast 10.36.101.3, Area 0.0.0.0<br /> MTU mismatch detection: enabled<br /> Router ID 10.36.5.1, Network Type NBMA, Cost: 10<br /> Transmit Delay is 1 sec, State Backup, Priority 1<br /> Designated Router (ID) 10.36.100.1 Interface Address 10.36.101.2/30<br /> Backup Designated Router (ID) 10.36.5.1, Interface Address 10.36.101.1<br /> Saved Network-LSA sequence number 0x80000005<br /> Multicast group memberships: OSPFAllRouters<br /> Timer intervals configured, Hello 1s, Dead 5s, Wait 5s, Retransmit 5<br /> Hello due in 0.012s<br /> Neighbor Count is 1, Adjacent neighbor count is 1<br />============================================================================================<br /><br /><br />output of "show ip ospf interface" when connection is down<br /><br />wg1 is up<br /> ifindex 9, MTU 1420 bytes, BW 0 Mbit <UP,POINTOPOINT,RUNNING,NOARP><br /> Internet Address 10.36.101.1/30, Broadcast 10.36.101.3, Area 0.0.0.0<br /> MTU mismatch detection: enabled<br /> Router ID 10.36.5.1, Network Type NBMA, Cost: 10<br /> Transmit Delay is 1 sec, State DR, Priority 1<br /> Designated Router (ID) 10.36.5.1 Interface Address 10.36.101.1/30<br /> No backup designated router on this network<br /> Saved Network-LSA sequence number 0x80000006<br /> Multicast group memberships: OSPFAllRouters<br /> Timer intervals configured, Hello 1s, Dead 5s, Wait 5s, Retransmit 5<br /> Hello due in 0.327s<br /> Neighbor Count is 0, Adjacent neighbor count is 0<br />===================================================================================<br /><br />output of tcpdump when connection is up:<br /><br />11:31:11.804925 IP (tos 0xc0, ttl 1, id 56965, offset 0, flags [none], proto OSPF (89), length 68)<br /> 10.36.101.2 > 10.36.101.1: OSPFv2, Hello, length 48<br /> Router-ID 10.36.100.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.2, Backup Designated Router 10.36.101.1<br /> Neighbor List:<br /> 10.36.5.1<br />11:31:11.950761 IP (tos 0xc0, ttl 1, id 28025, offset 0, flags [none], proto OSPF (89), length 68)<br /> 10.36.101.1 > 10.36.101.2: OSPFv2, Hello, length 48<br /> Router-ID 10.36.5.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.2, Backup Designated Router 10.36.101.1<br /> Neighbor List:<br /> 10.36.100.1<br />11:31:12.805336 IP (tos 0xc0, ttl 1, id 56968, offset 0, flags [none], proto OSPF (89), length 68)<br /> 10.36.101.2 > 10.36.101.1: OSPFv2, Hello, length 48<br /> Router-ID 10.36.100.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.2, Backup Designated Router 10.36.101.1<br /> Neighbor List:<br /> 10.36.5.1<br />11:31:12.951058 IP (tos 0xc0, ttl 1, id 28026, offset 0, flags [none], proto OSPF (89), length 68)<br /> 10.36.101.1 > 10.36.101.2: OSPFv2, Hello, length 48<br /> Router-ID 10.36.5.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.2, Backup Designated Router 10.36.101.1<br /> Neighbor List:<br /> 10.36.100.1<br />=======================================================================================<br /><br />output of tcpdump when connection is down:<br /><br />11:27:18.746172 IP (tos 0xc0, ttl 1, id 27984, offset 0, flags [none], proto OSPF (89), length 64)<br /> 10.36.101.1 > 10.36.101.2: OSPFv2, Hello, length 44<br /> Router-ID 10.36.5.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.1<br />11:28:18.746556 IP (tos 0xc0, ttl 1, id 27985, offset 0, flags [none], proto OSPF (89), length 64)<br /> 10.36.101.1 > 10.36.101.2: OSPFv2, Hello, length 44<br /> Router-ID 10.36.5.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.1<br />11:29:18.747514 IP (tos 0xc0, ttl 1, id 27986, offset 0, flags [none], proto OSPF (89), length 64)<br /> 10.36.101.1 > 10.36.101.2: OSPFv2, Hello, length 44<br /> Router-ID 10.36.5.1, Backbone Area, Authentication Type: none (0)<br /> Options [External]<br /> Hello Timer 1s, Dead Timer 5s, Mask 255.255.255.252, Priority 1<br /> Designated Router 10.36.101.1</span><br /><br /><br /> </html>