rtems_bsdnet_show_inet_routes

[Joel Sherrill]

Ian.. can you submit a patch that adds this explanation
somewhere in the networking guide?

Thanks.

--joel

Ian Caddy wrote:
> Hi Leon,
>
> I have had to explain almost the same things previously to our
> customers, so I have researched this in the past.
>
> Leon Pollak wrote:
>   
>> I have the board with two interfaces. When I run rtems_bsdnet_show_inet_routes
>> with both interfaces configured with static IP addresses I receive the
>> following:
>> --
>> Destination     Gateway/Mask/Hw    Flags     Refs     Use Expire Interface
>> 127.0.0.1       127.0.0.1          UH          0        0      0 lo0
>> 192.168.1.0     255.255.255.0      U           0        0      2 eth1
>> 192.168.50.0    255.255.255.0      U           0        0      1 eth0
>> --
>> But, when I define the first IF "eth0" to use bootp protocol, the result looks
>> as following:
>>
>> Destination     Gateway/Mask/Hw    Flags     Refs     Use Expire Interface
>> default         192.168.50.1       UGS         0        0      0 eth0
>> 127.0.0.1       127.0.0.1          UH          0        0      0 lo0
>> 192.168.1.0     255.255.255.0      U           0        0      2 eth1
>> 192.168.50.0    255.255.255.0      U           0        0      4 eth0
>> 192.168.50.1                       UHL         1        0      4 eth0
>>
>> -----------------
>> The questions are:
>> 1. What do the last 2 lines mean?
>>     
>
> The first of the two last lines is for the default route for the subnet
> of eth0, the same as the last line in the first section.
>
> The last line is for the the connection you have had with that
> particular IP address (your DHCP server).
>
> This table is your current routing table.
>
>   
>> 2. What is the "Expire" column meaning?
>>     
>
> The expire column indicates that the particular route will be dropped if
> there is no activity for the expiry time.
>
>   
>> 3. How are the "Flags" column letters interpreted?
>>     
>
> Since the stack comes from BSD, I have a link that explains a lot of
> what I am telling you as well:
>
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/network-routing.html
>
> Here is the list of flags:
>
> U       Up: The route is active.
> H       Host: The route destination is a single host.
> G       Gateway: Send anything for this destination on to this remote
>         system, which will figure out from there where to send it.
> S       Static: This route was configured manually, not automatically
>         generated by the system.
> C       Clone: Generates a new route based upon this route for machines
>         we connect to. This type of route is normally used for local
>         networks.
> W       WasCloned: Indicated a route that was auto-configured based upon
>         a local area network (Clone) route.
> L       Link: Route involves references to Ethernet hardware.
>
>
> Hope this helps.
>
> regards,
>
> Ian Caddy
>
> --
> Ian Caddy
> Goanna Technologies Pty Ltd
> +61 8 9444 2634
>
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>   


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel.sherrill at OARcorp.com        On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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