insmod vs modprobe -- plz help

[needee]

OS: SLES 10
plz correct me if am wrong, and also suggest

I think modprobe, and insmod are use to load/install *.ko(modules).. right .. if then why I am getting error when
1,
# insmod /lib/modules/2.6.16.21-0.8-smp/kernel/net/ipv4/netfilter/ip_nat_ftp.ko
insmod: error inserting '/lib/modules/2.6.16.21-0.8-smp/kernel/net/ipv4/netfilter/ip_nat_ftp.ko': -1 Unknown symbol in module
2,
# modprobe /lib/modules/2.6.16.21-0.8-smp/kernel/net/ipv4/netfilter/ip_nat_ftp.ko
FATAL: Module /lib/modules/2.6.16.21_0.8_smp/kernel/net/ipv4/netfilter/ip_nat_ftp.ko not found.

3,
# insmod ip_nat_ftp
insmod: can't read 'ip_nat_ftp': No such file or directory
# insmod ip_nat_ftp.ko
insmod: can't read 'ip_nat_ftp.ko': No such file or directory

But success when
4
# modprobe ip_nat_ftp

Plz help/explain
Regards
Needee

[cyberinstru]

modprobe: modprobe <module_name(extn not req)>
1. It finds kernel version, enters the respective path /lib/modules/`uname -r`, searches for the given module, and inserts it.

insmod: insmod <module_name (with extn .o or .ko)>
1. It looks for the module in the current path. So the complete path shud be given to load a module using insmod.


If you try to load a module that is not compiled for the running kernel, you wud get an error

-1 Unknown symbol in module

Or the same error is thrown out, if this module depends on some other module.

If the symbol table is updated (using depmod), modprobe checks for all dependencies and loads all the dependent modules.

insmod is not that intelligent as modprobe

[needee]

issue resolved ...Done.. Millions of thanks for sucha Nice n Prompt help

Thanks n regards
Needee