Date: Mon, 05 Nov 2012 17:29:49 +0100 From: Dimitry Andric <dim@FreeBSD.org> To: Alexandre Martins <alexandre.martins@netasq.com> Cc: freebsd-current@freebsd.org Subject: Re: Some question about IPv4 routes Message-ID: <5097E97D.80304@FreeBSD.org> In-Reply-To: <8632523.6dTPfJQh0d@pc-alex.netasq.com> References: <8632523.6dTPfJQh0d@pc-alex.netasq.com>
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On 2012-11-05 17:21, Alexandre Martins wrote:
> Since FreeBSD 8.0, there is some changes about routing table, in particular
> the IPv4 'link-local' route.
>
> In my case, i have this config: em0 192.168.0.1 / 24
>
>
> In FreeBSD < 8, if I run 'route get 192.168.0.0', it tell me :
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> route to: 192.168.0.0
> destination: 192.168.0.0
> mask: 255.255.255.0
> interface: em0
> flags: <UP,DONE,CLONING>
> recvpipe sendpipe ssthresh rtt,msec rttvar hopcount mtu expire
> 0 0 0 0 0 0 1500 -537398
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> And in FreeBSD >= 8
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> route: writing to routing socket: No such process
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Maybe the command parsing got more strict? It looks like you must add
the netmask to make it work:
$ route -n get 192.168.0.0
route: writing to routing socket: No such process
$ route -n get 192.168.0.0/24
route to: 192.168.0.0
destination: 192.168.0.0
mask: 255.255.255.0
interface: iflan
flags: <UP,DONE>
recvpipe sendpipe ssthresh rtt,msec mtu weight expire
0 0 0 0 1500 1 0
This is on stable/9.
> In addition, if I run a ping on network and broadcast address
> (ping 192.168.0.0; ping 192.168.0.255)
>
> In Freebsd < 8, a new route was created and i can see it in
> 'netstat -rn -af inet'
>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
> Internet:
> Destination Gateway Flags Refs Use Netif Expire
> 192.168.0.0 ff:ff:ff:ff:ff:ff UHLWb 1 1 em0 =>
> 192.168.0.255 ff:ff:ff:ff:ff:ff UHLWb 1 1 em0 =>
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
>
> But not in FreeBSD >= 8
>
>
> So, why is the broadcast route not created in FreeBSD >= 8 ?
Apparently the route to 192.168.0.0/24 already covers both of them, so
there is no need anymore to add explicit ones. I have no idea why this
changed after 8.x, though.
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