question about files

[Ronald Warsow]

hello 

help needed to investigate the firmware of my router.

the firmware is a simple tar archive, containing some simple files and 2 files i'm not able to look in:
1. filesystem.image
file filesystem.image gives:
filesystem.image: Squashfs filesystem, little endian, version 2.76, 2819566 bytes, 1078 inodes, blocksize: 65536 bytes, created: Mon Jul 17 13:50:08 2006

2. kernel.image
file kernel.image gives:
kernel.image: data

|:-<

any idea's to get a deeper look ???
hint: some site in the internet talking about BUSYBOX as the OS (?) of the router.

ronald