[LARTC] Re: Dead gateway detection

[Julian Anastasov <ja@ssi.bg>]

	Hello,

On Fri, 9 Aug 2002, Laurens van Alphen wrote:

> Q1: In the Nano-HOWTO on your site, it says to include these statements:
> "ip route append prohibit default table <tablename> metric 1 proto
> static"
> Why? What does it do? If I use these I can't connect to the Internet,
> without them I can.

	The reason can be that you have other rule/route settings.

	The purpose is: traffic using source addresses from failed
links should not try to use another alive link (some ISPs do not
allow spoofing from our side). Such prohibit rules avoid using
less-specific routes from other tables if the previous route is
deleted (metric 0).

> Q2: I have the following multipath route to the Internet:
> "default  proto static
>         nexthop via GW1 dev eth1 weight 1
>         nexthop via GW2 dev eth2 weight 1"
> If I unplug eth2 the second route is never marked as 'dead', why?
> Only if I 'ifconfig eth2 down' the second route is marked dead. I
> thought the patches would detect this?

	Linux detects failed gateways and does not use them but
the nexthops remain alive. Dead are only the routes administratively
marked as such. This is the current way.

> Thanks,
>
> --
> Laurens van Alphen
> Keen on dots

Regards

--
Julian Anastasov <ja@ssi.bg>

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