[Gllug] DHCP & DNS

David Damerell damerell at chiark.greenend.org.uk
Mon Dec 10 12:36:40 UTC 2001


On Monday, 10 Dec 2001, Stephen Harker wrote:
>On Friday 07 December 2001 09:47, you wrote:
>>No! Not 192.168.0.0/24! Pick a _random_ subnet of 192.168.0.0/16 or
>>the reserved class Bs specified in RFC 1918. Does no-one actually
>>read any standards anymore?
>Why does it have to be random? Approximately one in 256 times, 
>192.168.0.0/24 will be picked randomly.

Pick a random subnet between 192.168.2...254, to avoid the 2 popular
naive choices.

>And if its an unrouteable 
>address anyway, and on a private IP network behind a NAT router and 
>firewall, does it REALLY matter if a whole load of different people 
>use 192.168.0.0/24. I don't mean the technical answer, I mean the 
>practical everyday answer.

I have no idea what a non-technical answer to this question would be;
it's a technical issue.

The answer is that RFC1918 networks - even domestic ones - merge with
depressing regularity. The increasing penetration of broadband means
it's likely that technically competent home users will set up VPNs for
network games and the like.

Preparing for this possibility - even if it seems remote - does no
harm; so why not follow best practice?

-- 
David Damerell <damerell at chiark.greenend.org.uk> flcl?

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