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Re: [LINUX] IP_MASQ / Ethernet Passing Traffic After Halt
From: miquels () CISTRON NL (Miquel van Smoorenburg)
Date: Sat, 12 Apr 1997 12:04:51 +0200


In article <Pine.LNX.3.96.970411235054.377A-100000 () litterbox org>,
Sean B. Hamor <hamors () LITTERBOX ORG> wrote:
 A problem exists in IP Masquerade under Linux which allows traffic to be
 passed to external networks even after the gateway host has been halted.
 As long as a connection has been established from an internal machine via
 the IP Masquerade gateway to an external host and the Ethernet interfaces
 inside the machine are still being supplied power, that connection will
 stay online in a fully interactive state.

That might be true - the kernel as such keeps running if it is halted,
since a halt in Linux only means "kill all processes and then run an
idle loop". I don't believe the kernel keeps running during a warm reboot,
sorry...

Anyway, the latest halt and reboot of sysvinit (2.70) have a command line
switch "-i", which finds and shuts down all network interfaces. If you
get that one, and add a "-i" option to all calls to halt and reboot in
your init scripts, you're safe.

It might be better to fix this in the kernel..

Mike.



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