On 02.06.2012 23:59, Conrad Wood wrote:
[]
> In some "cloud" environments, including ours, we configure an ethernet device 
> with a single /32 IP Address. Say, for example 5.6.7.8/32. The Default 
> Gateway is, for example, 9.10.11.12. The linux kernel and BSD happily work as 
> desired and send out an arp request out of the ethernet device and route 
> _everything_ to the default gateway. 
> Configuring this manually is straightforward and works as desired.

> Using the ISC-DHCP client also works as desired. It picks up IP, Netmaks and 
> gateway perfectly well.

> However, in the installer, with the busybox dhcp client, it stalls and claims 
> it is unable to configure the network interfaces. Anything _apart_ from /32 
> (say /31, /30 etc.) works ok. But then the gateway won't be reachable, as the 
> kernel then tries to do 'propper(?)' routing instead of just forwarding the 
> packets.

Did you try using busybox dhcp client on an already
installed system, as opposed to the debian installer?

I just tried - dnsmasq as dhcp server, and squeeze busybox -
it accepts the /32 netmask just fine and configures the
interface accordingly.  I had to overwrite "netmask" option
on the server, setting it explicitly, and I verified with
tcpdump that the server sends correct DHCP reply with the
right netmask.

But I'm not actually sure how debian installer configures
the network...

Thanks,

/mjt



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