I want to change some files on my router. Firstly I can change everything in /var
, but I want to change /etc/fstab
. When I try to change it, I get an error message that says the file system is read only.
BusyBox inside the router has limited commands, so I got a BusyBox binary for MIPs, and uploaded it by tftp:
tftp -g -r busybox-mips my.i.p.addr
I can now use full commands (/var/tmp/busybox-mips command).
There is no ROM inside the router (SDRAM), nor is there any other partition. It must be related with BusyBox.
# /var/tmp/busybox-mips df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root 1344 1344 0 100% /
# mount
rootfs on / type rootfs (rw)
/dev/root on / type squashfs (ro)
proc on /proc type proc (rw,nodiratime)
ramfs on /var type ramfs (rw)
#
Model:
Airties 5021
Processor:
BCM6332KFBG
HS1037 P12
994981 N1
Memory:
M12L64164A-7T (SDRAM)
ANM1P02HL 1028
Best Answer
Squashfs is immutable. To change /etc/fstab you would need to make a new FS image for your router on a linux box. To get that on the router you do a "firmware upgrade".
You could also look in /proc/mounts to check whether
mount
is lying to you, as it only reads/etc/mtab
. But the latter is in most distros a symbolic link.