> On 23 Feb 2017, at 16:09, Ondrej Zajicek <[email protected]> wrote:
>
> On Thu, Feb 23, 2017 at 02:45:34PM +0100, Cedric Lemarchand wrote:
>> Hello,
>>
>> I am trying to distribute 2 static routes between 2 hosts, not directly
>> connected, and I am having hard time to make it works …
>>
>> host1 10.10.1.1 (eth0) own subnet 192.168.1.0/24 ( 192.168.1.1 on eth1)
>> host2 10.10.2.1 (eth0) own subnet 192.168.2.0/24 ( 192.168.2.1 on eth1)
>>
>> I get the following error :
>>
>> host1 bird: bgp1 < rejected by protocol 192.168.2.0/24 unreachable
>> host1 bird: bgp1 > updated [best] 192.168.2.0/24 unreachable
>
> Hello
>
> These are not errors, these are log messages enabled by 'debug all’.
Good to know, thanks.
> The only unexpected thing is that received routes are marked as
> unreachable. That is most likely because an IP address from route
> attribute bgp_next_hop cannot be resolved in your routing table
> But there should be routes learned by kernel protocols. What
> is your output of 'show route all' command?
Yes, I am not sure to understand how plays theses options (and if I need it) in
the bgp protocol and it they are related to my problem :
gateway recursive : means that if host2 advertise "route 192.168.2.0/24 via
10.10.2.1;” to host1, host1 does a lookup in the kernel routing table and set
the nexthop for 192.168.2.0/24 via the same IP as for host2 ? which makes sens,
at least for me, because host2 (10.10.2.1) is not directly reachable by host1
(10.10.1.1) and cannot be used as the next_hop in the kernel routing table, but
the gateway 10.10.1.254 is, this is what I would expect.
next hop self : means that every route advertised by host2 will be routed to it
self while keeping the “gateway recursive” logic ?
The output of show route all :
host1 :
—
10.10.2.0/24 unreachable [bgp1 15:32:13 from 10.10.2.1] ! (100/-) [i]
Type: BGP unicast univ
BGP.origin: IGP
BGP.as_path:
BGP.next_hop: 10.10.2.1
BGP.local_pref: 100
via 10.10.1.254 on eth0 [kernel1 15:30:42] (10)
Type: inherit unicast univ
Kernel.source: 3
Kernel.metric: 0
10.10.1.0/24 dev eth0 [direct1 15:30:42] * (240)
Type: device unicast univ
192.168.1.0/24 dev eth1 [direct1 15:30:42] * (240)
Type: device unicast univ
unreachable [static1 15:30:42] (200)
Type: static unicast univ
192.168.2.0/24 unreachable [bgp1 15:32:13 from 10.10.2.1] * (100/-) [i]
Type: BGP unicast univ
BGP.origin: IGP
BGP.as_path:
BGP.next_hop: 10.10.2.1
BGP.local_pref: 100
—
host2 :
—
10.10.2.0/24 dev eth0 [direct1 16:26:58] * (240)
Type: device unicast univ
10.10.1.0/24 unreachable [bgp1 16:27:00 from 10.10.1.1] ! (100/-) [i]
Type: BGP unicast univ
BGP.origin: IGP
BGP.as_path:
BGP.next_hop: 10.10.1.1
BGP.local_pref: 100
via 10.10.2.254 on eth0 [kernel1 16:26:58] (10)
Type: inherit unicast univ
Kernel.source: 3
Kernel.metric: 0
192.168.1.0/24 unreachable [bgp1 16:27:00 from 10.10.1.1] * (100/-) [i]
Type: BGP unicast univ
BGP.origin: IGP
BGP.as_path:
BGP.next_hop: 10.10.1.1
BGP.local_pref: 100
192.168.2.0/24 dev eth1 [direct1 16:26:58] * (240)
Type: device unicast univ
via 10.10.2.1 on eth0 [static1 16:26:58] (200)
Type: static unicast univ
—
>
> --
> Elen sila lumenn' omentielvo
>
> Ondrej 'Santiago' Zajicek (email: [email protected])
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."
