I notice there is a "default" directory in there, as well as an "all" and
one for each of your network interfaces. How does one know which is the
"default" interface? Also, what does the default interface imply... iow,
what changes would be inflicted by making a certain interface the default?
Does setting an option in one of the interfaces' directories override a
contradictory setting in the "all" directory? Or is it the other way
around? The kernel docs mention that "Changes in the all subdirectory
affect all interfaces, where changes in the other subdirectories affect
only one interface" but it does not say which will take precedence.
Would settings (such as accept_source_route, etc.) in this dir override
kernel firewall rules or will the rules still block source routed packets
if so configured? (Seems to me that the latter would be true.)
Also, in one of the LDP firewall How-Tos, I saw it noted that kernels
>=2.1 would auto-reject packets coming from 127.* if they were incoming on
any iface besides lo. However, I was able to spoof packets from 127.0.0.1
into my ppp0 interface from a remote box and they were not automatically
rejected (until I blocked them with ipchains). Is there something I did
wrong or was this feature removed somewhere between 2.1 and 2.2?
Lastly, each of these dirs has a "forwarding" option in it. Should this
override the setting in /proc/sys/net/ipv4/ip_forward?
TIA. Appreciate any responses (not counting flames, of course.) ;)
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