Re: [LARTC] iproute2: gatewayed routes in ancillary tables

[Julian Anastasov <ja@ssi.bg>]

	Hello,

On Tue, 6 May 2003, Martin A. Brown wrote:

>  : 	After "via" you can use local IP in addition to unicast
>  : one. You know it but the kernel is not sure.
>
> For me, this is new--I struggle to imagine a case where I would use this
> sort of syntax.  So, if I use "via <local-IP>", the kernel will
> essentially treat the route as though I had specified "dev <interface>",
> right?

	Yes, this is sort of "find dev for this local IP and use
it as outdev".

>  : 	But, considering the fact that GW IPs are always
>  : onlink (the kernel ignores the many variants of scopes and
>  : lookups only for onlink GWs),
>
> Ah-ha!  And, as well as an explanation, you have given me a solution.  In
> this case, I can use the following:
>
> ip route add 192.168.237.0/24 dev eth0 table 4
> ip route add 192.168.236.0/24 via 192.168.237.1 dev eth0  onlink  table 4

	I'm glad you saw it because I forgot about it :)

> The onlink tells the kernel what I know; that my use of "via" in this case
> is for a nexthop as a unicast destination.

	The only problem is that "onlink" can succeed even if
IP is not enabled for this device (may be there is a reason for
this) but I hope this is not a big problem.

Regards

--
Julian Anastasov <ja@ssi.bg>

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