Re: Linux 2.4.27 SECURITY BUG - TCP Local and REMOTE(verified) Denial of Service Attack

[Willy Tarreau]

On Mon, Sep 13, 2004 at 04:30:36AM +0100, Paul Jakma wrote:
 
> More specifically, BGP should have treated TCP resets as a transient 
> error, to be expected (indeed, they /cant/ be a sign that a link is 
> down - if you can receive a RST the link or path is patently quite 
> ok).

The application level does not always distinguish between TCP RST and
error generated by the local system because of a "network unreachable"
due to a link down and a lost route.

> The BGP state machine should instead, in normal operation, have 
> only treated Hold time expired as the definitive sign of "peer is 
> down" and allowed reconnects.

It should not necessarily wait for the time-out, but at least wait for
a few reconnect errors.

Regards,
willy

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