Hi, I’m trying to run FRR v8.4 under ubuntu16, configure OSPF on PPP/L2TP interface. After configuring xl2tpd/pppd under ubuntu, I’ve set up a pair of ppp0 interface. On the machine acting as LAC, the IP address of PPP0 is 172.16.0.1 and its peer is 172.17.0.1. Ifconfig shows: ============ Ppp0 Link encap: point-to-point protocol Inet addr:172.16.0.1 P-t-P:172.17.0.1 Mask:255.255.255.255 UP POINTTOPOINT RUNNING NOARP MULTICAST MTU:1500 Metric:1 ============ And I can ping 172.17.0.1 from 172.16.0.1. But when I configure OSPFD as below, no OSPF packet is sent through the ppp0 interface: ================================ hostname ospf password zebra enable password zebra ! interface ppp0 ip ospf network point-to-point ! interface lo ip ospf passive ip ospf passive 192.168.40.2 exit ! ! router ospf ospf router-id 192.168.40.2 network 192.168.40.2/32 area 0.0.0.0 network 172.16.0.1/32 area 0.0.0.0 exit ! ! ======================================= “Show ip ospf interface ppp0” says “OPSF not enable on this interface”. Could anybody kindly help me to find out what I’m missing? Thanks a lot, Orfeo