On 2 Jun 2012, at 22:14, Michael Tokarev wrote:

> 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
> 

Hm, I believe we did. +CC Jens Ott, our network guru, I think he did try. Let's 
see what he has to say about that ;)

Conrad




Conrad Wood
(Deputy CTO, Head of Research & Innovations)

ProfitBricks GmbH
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D - 10405 Berlin
 
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