Which kernel options were set at compile time?

[MichaelS-R]

I need to find out if the following kernel options were set at compile time. Is there a simple way to discover this without having to rebuild the kernel?
IP: advanced router (CONFIG_IP_ADVANCED_ROUTER) [Y/n/?]
IP: policy routing (CONFIG_IP_MULTIPLE_TABLES) [Y/n/?]
IP: use netfilter MARK value as routing key (CONFIG_IP_ROUTE_FWMARK) [Y/n/?]Many thanks,

Michael

[ivancat]

If you mean options for the kernel but got from fedora you didn't compile yourself then they can be found under /boot, filename is something like config-2.6.xx.xx-x.fcx

if you compiled the kernel yourself, then check the .config file in the directory you compiled in.
that means if you used make O=/usr/src/kernels/2.6.25.10, then the .config file is inside /usr/src/kernels/2.6.25.10

if you didn't use the O option then the .config file is in the directory you untared your kernel tarball and made all compilations

[MichaelS-R]

Thanks Ivancat - the first line was what I was after. Just did not cross my mind to look in /boot.

One thing though, CONFIG_IP_ROUTE_FWMARK does not exist as an option in the config file. Do you know if it has been depracated or does that mean that it turned off?

Thanks,

Michael

[ivancat]

Since Linux 2.6.20, mark based routing has been enabled by default, thus
the related config options {DECNET,IP,IPV6}_ROUTE_FWMARK have been removed.

if you want to route packets, then the following options come in handy:

IP_ADVANCED_ROUTER, IP_MULTIPLE_TABLES, anything which allows to mangle the packet mark such as the Netfilter MARK target (NETFILTER_XT_TARGET_MARK).

[MichaelS-R]

Ivancat - may thanks. Still not working though - will move my questions over to the networking forum.