A.5 Debugging

Console-Outputs are most helpful for hunting bugs. But these go by so fast on the screen, don't they? Hint: SHIFT-PAGE-UP scrolls back, SHIFT-PAGE-DOWN scroll forwards.

If the error message ``try-to-free-pages'' occurs during router use there is not enough RAM left for the programs. Try the following options to recover:

add more RAM
use less Opt-Packages
try a harddisk-installation according to Typ B

proc-files can help debugging, for example executing

                cat /proc/interrupts

shows the interrupts used by the drivers - not those used by the hardware!

More interesting files under /proc are devices, dma, ioports, kmsg, meminfo, modules, uptime, version and pci (if the router has a PCI-Bus).

Often a connection problem with ipppd is caused by failing authentification. The variables

        OPT_SYSLOGD='yes'

        OPT_KLOGD='yes'

in config/base.txt and

        ISDN_CIRC_x_DEBUG='yes'

in config/isdn.txt can help here.