Hi All, When configuring a ptp interface, the local address is /32, and the prefix is supposed to be applied to the peer address I not using a non /32 peer but was curious when reading `man ip-address` # ip link add name wg-test1 type wireguard # ip link set wg-test1 up # ip addr add dev wg-test1 1.2.3.4 peer 5.6.7.8/24 # ip addr show wg-test1 11: wg-test1: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN group default qlen 1000 link/none inet 1.2.3.4 peer 5.6.7.8/24 scope global wg-test1 valid_lft forever preferred_lft forever # birdc show ospf interface Interface wg-test1 (1.2.3.0/24) Type: ptp Area: 0.0.0.0 (0) State: PtP ... (we should see `Interface wg-test1 (peer 5.6.7.8/24)`) # strace -f -s 10000 ip addr show wg-test1 recvmsg(3, {msg_name={sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, msg_namelen=12, msg_iov=[{iov_base={{len=84, type=RTM_NEWADDR, flags=NLM_F_MULTI|NLM_F_DUMP_FILTERED, seq=1611526183, pid=25832}, {ifa_family=AF_INET, ifa_prefixlen=24, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_UNIVERSE, ifa_index=if_nametoindex("wg-test1")}, [{{nla_len=8, nla_type=IFA_ADDRESS}, inet_addr("5.6.7.8")}, {{nla_len=8, nla_type=IFA_LOCAL}, inet_addr("1.2.3.4")}, {{nla_len=13, nla_type=IFA_LABEL}, "wg-test1"}, {{nla_len=8, nla_type=IFA_FLAGS}, IFA_F_PERMANENT}, {{nla_len=20, nla_type=IFA_CACHEINFO}, {ifa_prefered=4294967295, ifa_valid=4294967295, cstamp=2331331, tstamp=2331331}}]}, iov_len=32768}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 84 https://github.com/torvalds/linux/blob/master/include/uapi/linux/if_addr.h#L... * IFA_ADDRESS is prefix address, rather than local interface address. * It makes no difference for normally configured broadcast interfaces, * but for point-to-point IFA_ADDRESS is DESTINATION address, * local address is supplied in IFA_LOCAL attribute. Best Etienne