reading routing table

[Julian Elischer]

Bruce M. Simpson wrote:
> Debarshi Ray wrote:
>> ...
>> I was going through the FreeBSD and NetBSD documentation and the
>> FreeBSD sources of netstat and route. I was suprised to see that while
>> NetBSD's route implementation has a 'show' command, FreeBSD does not
>> offer any such thing. Moreover it seems that one can not read the
>> entire routing table using the PF_ROUTE sockets and RTM_GET returns
>> information pertaining to only one destination. This suprised me
>> because one can do such a thing with the Linux kernel's RTNETLINK.
>>
>> Is there a reason why this is so? Or is reading from /dev/kmem the
>> only way to get a dump of the routing tables?
>>   
> 
> You want 'netstat -rn' to dump them, this is a very common command which 
> should be present in a number of online resources on using and 
> administering FreeBSD so I am somewhat surprised that you didn't find it.
> 
> P.S. Look in the sysctl tree if you need to snapshot the kernel IP 
> forwarding tables. You can use kmem, but it is generally frowned upon 
> unless you're working from core dumps -- kernels can be built without 
> kmem support, or kmem locked down, etc.

unfortunatly netstat -rn uses /dev/kmem

we've just never got around to implementing a better interface..

> 
> cheers
> BMS
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