0

Running ifconfig eth0, there is one Global addr and also a Link addr of my NIC. What do they mean? I know the Global one is my "real" ip address.

    eth0      Link encap:Ethernet  HWaddr 28:d2:44:e6:9f:d4  
              inet addr:10.170.5.181  Bcast:10.170.255.255  Mask:255.255.0.0
              inet6 addr: 2001:da8:8001:8000::2:91ef/64 Scope:Global
              inet6 addr: fe80::2ad2:44ff:fee6:9fd4/64 Scope:Link
              UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
              RX packets:56060 errors:0 dropped:0 overruns:0 frame:0
              TX packets:32740 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:1000 
              RX bytes:68881613 (68.8 MB)  TX bytes:3285510 (3.2 MB)
Improve this question
1

A link-local address which is derived during stateless address auto-configuration (defined in RFC 4862) so that your computer can communicate on local networks without any information obtained from an external source (such as DHCP or IPv6 router solicitation/advertisement).

Unless manually configured, it is derived from the MAC address of the NIC in EIU-64 format (for Ethernet) and begins with FE80:: with a /64 prefix, and every NIC on a system will have one (by default).

Improve this answer
  • Thanks for your reply but I have one more quetion to ask. – Jason Tao Mar 4 '16 at 15:30
  • is it related? if so, update your question – stevieb Mar 4 '16 at 15:31
  • There seems to be problems with my ISP's IPv6 service so it made my connection not stable. I have heard from others that the ISP router used DHCPv6 to allocate the IPv6 address. However, it used NDP to advertise packages. I am not really clear about the meaning of this. But if it is true, what should I configure on Ubuntu? I am using /etc/network/interfaces to configure my network. And it currently reads "iface eth0 inet6 dhcp". Should I alter it to static? – Jason Tao Mar 4 '16 at 15:39
  • how can I find the router's link-local address using my own computer? – Jason Tao Mar 5 '16 at 9:18

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.