Re: Do you know the TCP stack? (127.x.x.x routing)

From: Zdenek Radouch
Date: Sun Mar 06 2005 - 14:52:09 EST

OK, I think I am getting the picture.

1) looks like what I need may be possible, at least as far as
some kernels are concerned. It's not clear that 2.4.25 will work.

2) I only have to perform close to magic in locating the "right"
tools that happen to work on a "right" kernel release.

3) Clearly the route processing is in flux, at least within the
releases I am dealing with, so I need to be careful interpreting
what I see, and I should avoid making any inferences.

There is no doubt that the 127.x net is treated in a special
way. If I have to believe what I just learned, then the 127
routes are in a "local" table, a table on which the "route"
utility by definition does not operate! On the 2.4.25 machine
I cannot get any of the "ip" commands to execute without
an error:

$ ip route del dev lo table local
ip: either "to" is duplicate, or "table" is a garbage.

Since there was no "to" on the command line I suspect
the busybox crap to be doing something very bad.
I'll look at that.

To summarize, it appears that I can subnet the 127 net
by appropriately manipulating one or two kernel routing tables,
if I can find the right tools to do that. If the tools don't work, then
getting the tools to work would be the necessary modifications
I would have to make on my machines to get the job done.

I'd like to thank everyone for their help.

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