$ /sbin/ifconfig eth0 eth0 Link encap:Ethernet HWaddr 00:50:56:B6:53:10 inet addr:10.49.22.20 Bcast:10.49.22.255 Mask:255.255.255.0 inet6 addr: fe80::250:56ff:feb6:5310/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:12739003 errors:0 dropped:0 overruns:0 frame:0 TX packets:4630164 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3144021160 (2998.3 Mb) TX bytes:991348328 (945.4 Mb) #### fgrep fe80::250:56ff:feb6:5310 tr connect(3, {sa_family=AF_INET6, sin6_port=htons(21), inet_pton(AF_INET6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=if_nametoindex("eth0")}, 28) = -1 EINPROGRESS (Operation now in progress) connect(3, {sa_family=AF_INET6, sin6_port=htons(21), inet_pton(AF_INET6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=if_nametoindex("eth0")}, 28) = 0 getsockname(3, {sa_family=AF_INET6, sin6_port=htons(47829), inet_pton(AF_INET6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=if_nametoindex("eth0")}, [28]) = 0 bind(4, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "fe80::250:56ff:feb6:5310", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = -1 EINVAL (Invalid argument)