On Fri, May 29, 1998 at 10:49:33AM -0500, Gregory Guthrie wrote: > The basic question is: is IP-forwarding on in the default kernel No. > , and how does one tell look at /boot/config-<kernel-version>, included in every kernel-image-xxx package of debian. (N.B. This inlcudes kernel-image-xxx packages you build yourself when using make-kpkg, which is one of many reasons to use this package to build your custom kernel) > or does one have to build a custom kernel to do routing? Yes. You should do that for routers anyway. There are so much possibilities and tuning to be done if you want to build a router. > -- In gereral, how does one tell if a feature is on in a kernel? That is next to impossible, if you are given a kernel image only. > We want to setup a local simple router-pair, to create a LAN-remote subnet > segment. > > I thought we could tell by "cat /proc/ksyms | grep forward" : > 00140988 ip_forward_R35268aee > 0022ae04 sysctl_ip_forward_Ra7d20d83 > > Is this correct? seems to say yes; or do we have to rebuild a new kernel. No, it is not. You do need a custom kernel. N.B: I do not know, why the above symbols are in /proc/ksyms. They are present in mine also, although I know I do not have ip forwarding enabled. Does anyone know a better test? > "grep FORWARD /usr/src/linux/.config" is the ideal command for this. > CONFIG_IP_FORWARD=y means it is turned ON > # CONFIG_IP_FORWARD is not set means it is turned OFF This still holds for debian, if you replace /usr/src/linux/.config by /boot/config-`uname -r` > What about Debian? > On the CDROM (1.3.1), the .config file says: > ---------------------- > ... > # CONFIG_IP_FORWARD is not set > ... > Does this correspond to the binary kernel distributed, or is it just a > standard default spec for building new kernels? it corresponds to the binary kernel distributed. > 4) We also need PPP proxyarp, is it on by default (curious about the ARPD > not set). This is not related to kernel compiling options. ARPD is in case you have a single (non bridged) ethernet with a *lot* (more that 256) of nodes on it. Nils -- *-----------------------------------------------------------------------------* | Quotes from the net: L> Linus Torvalds, W> Winfried Truemper | | L>this is the special easter release of linux, more mundanely called 1.3.84 | | W>Umh, oh. What do you mean by "special easter release"?. Will it quit | * W>working today and rise on easter? *
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