Hi Ondrej and all, after a long time I need to setup a ppp tunnel between linux machine and a MikroTik router and the linux ppp0 interface results up and running as follows: ppp0 Link encap:Point-to-Point Protocol inet addr:44.134.32.240 P-t-P:10.58.2.1 Mask:255.255.255.255 UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1450 Metric:1 RX packets:442 errors:0 dropped:0 overruns:0 frame:0 TX packets:359 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:3 RX bytes:31271 (30.5 Kb) TX bytes:23174 (22.6 Kb) the ppp0 interface reported by BIRD is the following: ppp0 up (index=23) PtP Multicast AdminUp LinkUp MTU=1450 44.134.32.240/32 (Primary, opposite 10.58.2.1, scope univ) as you can see the Mask value on the above linux interface is 255.255.255.255. Now running an OSPF session on both sides (linux BIRD OSPF and Mikrotik OSPF) it happens that the BIRD on linux (ir0rm-7.ampr.org/44.134.32.240) transmits the Hello packets with a Mask 0.0.0.0 and then the Mikrotik discards the BIRD Hello packets due to mismatch in network mask (see the following tcpdump on linux machine and Mikrotik log picture). There is a continue Hello packets as below with no apparent OSPF routing exchange. I'm using the latest BIRD git version... Something wrong on my side? regards, gus [i0ojj] --------------------- 16:57:41.140591 IP (tos 0xc0, ttl 1, id 54307, offset 0, flags [none], proto OSPF (89), length 64) ir0rm-7.ampr.org > ospf-all.mcast.net: OSPFv2, Hello, length 44 Router-ID 10.58.1.1, Area 0.0.0.254, Authentication Type: none (0) Options [External] Hello Timer 10s, Dead Timer 40s, Mask 0.0.0.0, Priority 1 16:57:41.402749 IP (tos 0xc0, ttl 1, id 48993, offset 0, flags [none], proto OSPF (89), length 64) 10.58.2.1 > ospf-all.mcast.net: OSPFv2, Hello, length 44 Router-ID 10.58.1.1, Area 0.0.0.254, Authentication Type: none (0) Options [External] Hello Timer 10s, Dead Timer 40s, Mask 255.255.255.255, Priority 1 Designated Router 10.58.2.1
