when interface goes down you must flush the cache to generate a new
routing table.
this perl script cheks and fix this.
have you done masquerading from an internal network?
cause that does not work for mi..you may help me :)
On Mon, 2003-03-03 at 10:43, Никита Винокуров wrote:
> Hi all!
>
> I have a set up of router with two ISP providers. Each on ADSL modem and with
> public IP address. I've the patch from Julian Anastasov applied
> (routed-2.4.20-9.diff).
> External interfaces are: eth1 and eth2, internal is: eth0. The modems serve as
> gateways to my router, so, I simply set them as gateways on correspondent interfaces.
>
> Multipath routing is implemented as two nexthop's:
>
> ip route add default table 222 proto static \
> nexthop via $GATEWAY1 dev eth1 weight 1 \
> nexthop via $GATEWAY2 dev eth2 weight 10
>
> so when I plug-off the eth1 link to first modem, all the traffic moves to go through
> the eth2 and vice-versa. It works successfully.
>
> The problem is that the most probably situation is not when one of my gateways is
> down (because it's really a modem and I have full access to it), but when the modem
> link to one of providers is down. So almost always I have the routes to be present
> in the system (I think because of the gateways are really up) and cached while one
> of my provider is down. The point is that the packets passed through the eth2 keep
> the same route even after my second provider fails (but gateway remains reachable)
> and they dont want to switch to the eth1. So any connection seems not working.
>
> Please, help. How to detect that the link _behind_ a gateway is break? All the time
> gateways are reachable. _______________________
>
> --
> Nikita________________
> _______________________________________________
> LARTC mailing list / [EMAIL PROTECTED]
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
>
--
Esteban Ribicic
Network Operation Center
UOL-Sinectis S.A.
Florida 537 Piso 6, Buenos Aires, Argentina
+54-11-4321-9110 Ext 2503
+54-11-4321-9107 Directo
[EMAIL PROTECTED]
www.uolsinectis.com
#!/usr/bin/perl
#
# Limpia el routing cache de ser necesario
#
$PATH_IP="/bin/ip";
my @routels=`$PATH_IP route ls`;
for (@routels) {
chop($_);
if ( $_=~/dead/ ) {
system("$PATH_IP route flush cache");
print "done\n";
}
}
