dhcp for 2 subinterface (Simon Hobson)
Simon Hobson
dhcp1 at thehobsons.co.uk
Fri Oct 22 18:06:28 UTC 2010
Evans Lin ( ó-â¿ï¤ ) wrote:
>My server need to release two sub bundle in the
>same group (10.10.20.1 & 10.106.0.1),
> but the broadcast will only appear 10.10.20.1
>subbundle-a corresponding to its own
>"a.mac.list", subbundle-b corresponding to their
>"b.mac.list"
>I want to know if you can do: When "b.mac.list "
>mac up to use 10.10.20.1 gw discover , the
>server must offer 10.106.0.x , but not
>10.10.20.x ...
OK, if you want my help, don't go out to annoy me
! Bottom post (ie put your text BELOW whatever
you quote) and trim stuff that isn't relevant (in
this case the other 15k of the days messaeg
digest !) - I've already pointed that once.
That's just good etiquette. If the help you want
isn't worth just one minute of your time, why
should it be worth five minutes of mine ?
http://www.catb.org/esr/faqs/smart-questions.html
It's been discussed many times on the list, and
there are several ways to achieve what you want -
which you use depends on various factors.
For example, is this a one-off thing (ie there is
only this one network you want to do this in)
or will this need to be done with multiple networks ?
If you do want to do it in multiple networks,
will they all use the same split of guests ? Ie
will they all use the same a.list and b.list ?
What do you want to happen to devices not listed ?
Do you actually need to do this ? What are you
trying to achieve ? It's important to ask as you
are making a lot of extra work for yourself which
may not be necessary.
Method 1
Define those hosts you want in one subnet with host declarations, like this :
shared-network "foo" {
subnet 1.2.3.0 ... {
pool {
range a.b.c.w a.b.c.x ;
allow known-hosts ;
}
}
subnet d.e.f.0 ... {
pool {
range d.e.f.y d.e.f.z ;
deny known-hosts ;
}
}
}
host "foo-1" { hardware ethernet aa:bb:cc:dd:ee:ff ; } ;
host ...
In this method, any device with a host statement
will get a lease from the first subnet, all
others will get a lease from the second subnet.
You need to maintain a list of hosts, and all
shared networks would need to use the same split
between clients.
Method 2
Use classes - see the man section on classes and subclasses
class "a-list" { match hardware ; }
class "b-list" { match hardware ; }
subclass "a-list" 1:aa:bb:cc:dd:ee:ff ;
subclass "b-list" 1:uu:vv:ww:xx:yy:zz ;
subclass "a-list" ...
...
shared-network "foo" {
subnet 1.2.3.0 ... {
pool {
range a.b.c.w a.b.c.x ;
allow members of "a-list" ;
}
}
subnet d.e.f.0 ... {
pool {
range d.e.f.y d.e.f.z ;
allow members of "b-list" ;
}
}
}
You can of course just omit the b-list and use
allow/deny as in the first option. You can also
use different classes for different networks.
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
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