Thread: What would make the Ubuntu laptop suddenly lose its assigned IP address?

recently set wireless network following wisp's instructions , surprised see ubuntu laptop's assigned ip address disappear.

q: make ubuntu laptop's ip address disappear?



example, @ time 0, set laptop's ip address same subnet of wisp radio, e.g.:

code:

$ sudo ifconfig eth0 10.0.67.1 $ ifconfig reports: eth0      link encap:ethernet  hwaddr 00:a0:d3:3e:25:44             inet addr:10.0.67.1  bcast:10.255.255.255  mask:255.0.0.0           inet6 addr: fe80::216:d3ff:fe3e:8304/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:1873 errors:0 dropped:0 overruns:0 frame:0           tx packets:2272 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:100            rx bytes:1348760 (1.3 mb)  tx bytes:331202 (331.2 kb)           memory:f8200000-f8220000

once both laptop , bullet m2 wisp radio on same subnet, can log wisp radio fine wired ubuntu laptop (because both on same subnet).

but, (roughly in few minutes), invariably lose connection wireless radio.

@ first, didn't know why ... then, after debugging, belatedly realized laptop's ip address disappeared (without me realizing had been deleted).

@ time ~= 5 minutes, "ifconfig" reported following on ubuntu laptop:

code:

$ ifconfig eth0      link encap:ethernet  hwaddr 00:a0:d3:3e:25:44             inet6 addr: fe80::216:d3ff:fe3e:8304/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:1873 errors:0 dropped:0 overruns:0 frame:0           tx packets:2264 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:100            rx bytes:1348760 (1.3 mb)  tx bytes:329076 (329.0 kb)           memory:f8200000-f8220000

notice there no ip address reported eth0 though did not run ifconfig command!

i'm confused why ubuntu laptop apparently lost ip address had assigned further configure wisp radio.

of course, if reassign original ip address laptop, laptop can again connect wisp radio ... ... confusion ...

q: make ubuntu laptop lose assigned ip address?

attached images

• ubuntu.jpg (62.7 kb, 42 views)

would not easier let router automatically handle ip address assigning dhcp? if router has dhcp capability should able set admin screen.

either way here's list of ip's , subnets:-

internationally-established private ip address ranges can assigned internal network computers follows:

* 10.0.0.1 through 10.255.255.254
16,777,214 addresses
16,777,214 computers on 1 network
(10.x.x.x)
uses subnet mask of 255.0.0.0
first octet must same on computers
class address range

* 172.16.0.1 through 172.31.255.254
1,048,574 addresses
65,534 computers on each of 16 possible networks
(172.16.x.x 172.31.x.x)
uses subnet mask of 255.255.0.0
first 2 octets must same on computers
class b address range

* 192.168.0.1 through 192.168.255.254
65,534 addresses
254 computers on each of 256 possible networks
(192.168.0 255.x)
uses subnet mask of 255.255.255.0
first 3 octets must same on computers
class c address range

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