Jails on fib problem

[Nikolay Denev]

On Tue, Jan 28, 2014 at 5:17 PM, Beeblebrox <zaphod at berentweb.com> wrote:
>> what's a fib device? Do you mean each jail has a different default fib?
>> you are not using vimage jails?
>
> Hi Julian.
> * No vimage
> * All jails use the same fib. /etc/rc.conf:
> cloned_interfaces="lo2"
> ifconfig_lo2="inet 127.0.1.1/28"
> static_routes="jail default"
> route_jail="default 127.0.1.1 -fib 1"
> route_default="default 192.168.1.1"
>
>> so they all have the same address?? can you even do that? or you mean that
>> they all have the same default route?
> I mean same default route, jail IP's start from 127.0.1.2/32 and go to
> 127.0.1.6/32
> jail.conf assigns fib with "exec.fib = 1;"
> jails on the 127.0.1.1/28 subnet range should be able to route traffic
> through the 127.0.0.1 gateway regardless of the fact that the jails
> themselves reside on a /32 subnet. However, it's not working smoothly
>
>> fibs don't have devices.
> Yes, I know  - a misnomer.
>
> setfib 1 netstat -rn
> Destination        Gateway            Flags    Netif Expire
> default            127.0.1.1          UGS       lo2
> 127.0.0.1          link#3             UH        lo0
> 127.0.1.1          link#4             UH        lo2
> 127.0.1.2          link#4             UH        lo2
> 127.0.1.3          link#4             UH        lo2
> 127.0.1.4          link#4             UH        lo2
> 192.168.1.0/24     link#1             U         re0  (Ext_If)
> 192.168.2.0/26     link#2             U         re1  (Lan_If)
>
> To complicate things further, I also have a vboxnet0 for VBox guests.
> 127.0.1.2 is a dns jail for example. The Internal LAN clients,
> vboxnet0 guests and lo0 need to resolve names from that jail.
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You can't use 127/8 addresses and expect them to be routed/forwarded.
See rfc1122.

--Nikolay