When I was configuring kernel 2.2.13 (make menuconfig) I was looking for IP: always defragment (CONFIG_IP_ALWAYS_DEFRAG) and I couldn't find it. It had to be somewhere because its required for masquerading.
Then it hit me, some kernel options are moving to /proc/sys/* and can be configured at runtime. For example, to enable up forwarding you can do: # echo 1 > /proc/sys/net/ipv4/ip_forward or # sysctl -w net/ipv4/ip_forward=1 (I prefer sysctl...) And yes, CONFIG_IP_ALWAYS_DEFRAG was moved to /proc/sys/net/ipv4/ip_always_defrag Here is the silly question: Where are all /proc/sys/* options described??? (or all the /proc/* entries for that matter) Regards, Onno