kernel/2871: surprising route table changes

>Number: 2871
>Category: kernel
>Synopsis: after some time the route table changes w/o routed/gated
>Confidential: no
mediaBase GmbH, 80939 Munich, FR Germany net
>Environment:

	System      : OpenBSD 3.1
	Architecture: OpenBSD.i386
	Machine     : i386

>Description:

	My workstation MY wants to route packets to one specific host MSP via
	a router SLOW (Linux) and other packets to the local net and other
	packets via a router FAST (Linux).
	SLOW uses a NAT-IP A that authenticates him at the POP3 and SMTP host
	of our mail service provider. The connection is often down and it takes
	up to 15 seconds to bring it up.
	FAST cannot use NAT-IP A but NAT-IP UNPRIV. Is nearly always up due to
	ntpd. :)
	After some time MY changes the route for dest MSP
	(a) so that router FAST routes that connection with the
	    non-priviledged UNPRIV
	(b) so that the MSP refuses our connection attempts which makes
	    our office assistant rather angry... :-) *sniff*

>How-To-Repeat:

	1. enter:
	   > route add MSP SLOW
	2. the command
	   > route show
	   shows
		[...]
		Internet:
		Destination      Gateway            Flags 
		default          cerberos.local.med UG     
		127.0.0.0        localhost          UG     
		localhost.local. localhost          UH     
		MSP              cordoba.local.medi UGH    
		195.243.73.0     link#1             U      
		cordoba.local.me 0:0:1c:b5:a1:df    UH     
		gargano.local.me localhost          UGH    
		cerberos.local.m 0:60:8:a9:b7:4d    UH     
		BASE-ADDRESS.MCA localhost          U      
		[...]
	3. wait some hours
	4. the command
	   > route show
	   shows a route change without my interaction and without
	   routed/gated influence

>Fix:

	my workaround:
	I added a route on FAST to SLOW for host MSP.

>Release-Note:
Received on Thu Nov 7 15:32:27 2002