Mailinglist Archive: opensuse (1483 mails)

[Anders Johansson <ajh@xxxxxxxx>]

On Sunday 26 February 2012 08:09:31 James Knott wrote:
> Ruediger Meier wrote:
> > > At any given time, how many routing tables would you have in use?
> >
> > I guess even you have more than one routing table in use. At least 4
> > ones: local/ipv4, local/ipv6, main/ipv6, main/ipv6.
>
> What are you referring to be local and main?  Routing is only used for
> destinations that are not on the local network.  Therefore, there
> shouldn't ben any routing table entries for anything on the local
> network. 

local is a special routing table for localhost and broadcast. It is managed by 
the kernel

ip r show table 255

There are other reasons for wanting to use multiple routing tables. I have 
seen some routing conundrums that could only be solved with them. Such 
problems usually involve multiple network cards, and multiple viable paths to 
the same host, where the kernel by default makes the wrong choice and you have 
to step in and force it to do the right thing

Anders
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