After http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47e0e1ca13d64eeeb687995fbe4e239e743d7544 commit, documentation has not beed updated: http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob;f=Documentation/networking/ip-sysctl.txt;h=8be76235fe6724c43e0c2b39778f3f741e53b619;hb=HEAD#l1104
Changing the default value causes something nasty, please see https://bugzilla.kernel.org/show_bug.cgi?id=17912. Regards, Stephan Bärwolf (stephan.baerwolf@tu-ilmenau.de)
Closing, as this doesn't appear to be a bug in a man page. If I've missed something, please reopen, or reopen and assign to the appropriate maintainer.