![](https://seccdn.libravatar.org/avatar/496cefddd79a40cba98af46c44088f45.jpg?s=120&d=mm&r=g)
On Mon, 2005-06-13 at 07:59 -1000, Susemail wrote:
How do I tell if it's a valid one? I know 127.0.0.1 is valid:
lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:8699 errors:0 dropped:0 overruns:0 frame:0 TX packets:8699 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:2750512 (2.6 Mb) TX bytes:2750512 (2.6 Mb)
Jerome
If someone already pointed this out, please discard my comment: 1. As you can see, "lo" is Local Loopback interface. Even if your linux machine is not connected network at all, you can always "ping" any IP addresses in this subnet, which are 127.0.0.1 - 127.255.255.254. Those ping packets never go out through your ethernet port. 2. If you have any ethernet interface, you should have "eth0" interface like below, in addition to "lo": suse93-2:~ # ifconfig eth0 Link encap:Ethernet HWaddr 00:0B:6A:2C:B0:45 inet addr:192.168.254.2 Bcast:192.168.254.255 Mask:255.255.255.0 inet6 addr: fe80::20b:6aff:fe2c:b045/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5410 errors:0 dropped:0 overruns:0 frame:0 TX packets:5166 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3035562 (2.8 Mb) TX bytes:631546 (616.7 Kb) Interrupt:11 Base address:0xbc00 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:938 errors:0 dropped:0 overruns:0 frame:0 TX packets:938 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:74812 (73.0 Kb) TX bytes:74812 (73.0 Kb) "eth0" is the real ethernet interface. Please check this at your PC. Toshi