Hello,
Why it happens that whenever i try to up interface which is previously down by me gives error. what should be wrong in my configuration which is static IPs to eth0 and eth1
ifup eth1
ipcalc: bad ip address: 10.0.0.
Error: an inet prefix is expected rather than "10.0.0./".

my configuration is
eth0 Link encap:Ethernet HWaddr 00:08:A1:43:61:F5
inet addr:10.0.1.100 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:240 (240.0 b)
Interrupt:9 Base address:0xbc00

eth1 Link encap:Ethernet HWaddr 00:80:48:C3:11:94
inet addr:10.0.1.200 Bcast:10.255.255.255 Mask:255.0.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:8 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:915 (915.0 b) TX bytes:420 (420.0 b)
Interrupt:11 Base address:0xdc00

is this not a clue?
10.0.0. ?

what happens with

ifconfig eth1 up 10.0.0.200
ifconfig eth1 down

:?

Both commands run successfully without error.