[ECOS] Re: How to deconfigure an interface?

[Tarmo Kuuse <tarmo dot kuuse at mail dot ee>]

Hi Stanislav,

Stanislav Meduna wrote:
> I'd like to be able to change an IP address of an interface
> without reboot. 

Same here.

> The same happens if I try to set the address using SIOCSIFADDR.
> Is this the intended behaviour? Shouldn't the SIFADDR
> change the address and AIFADDR add a new one?

I think it's intended behaviour.

> Is there a way to bring the IP stack back to the clean
> state, or does one needs to deconfigure the interface
> step-by step by removing addresses already configured
> using SIOCDIFADDR (which works)?

There could be a better way, but I just do SIOCGIFADDR to read the 
current addresses from an interface and delete them with SIOCDIFADDR. As 
input, the "struct ifreq" needs the interface's textual name (e.g. 
"eth0"). Works fine.

Another task which needs doing is clearing the routes table. There 
exists a function "cyg_route_reinit()" which simply flushes all routes. 
Unfortunately it also deletes routes for the local loopback and all 
other interfaces you may have. I haven't yet figured out how to delete 
the routes only for a given interface.

Have a look at function do_dhcp_down_net() in dhcp_prot.c for an example.

--
Kind regards,
Tarmo Kuuse


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