help :giaddr

[abhijit khadatare]

thanks for ur valuable advice ,
static entry makes working my set up but still i have some doubt
now network topology is like this

client ------->layer2------>[if0]Router[if1]-------->dhcp server

layer2 ip[static]----192.168.1.46/24
router if0------------192.168.1.1/24
router if1------------192.168.2.5/24
dhcp server------192.168.2.1/24

but if layer 2 switch is also getting ip from dhcp server , how can we
achieved that??
thanks once again .
regards,
abhijit



On Thu, Oct 16, 2008 at 6:57 PM, Simon Hobson <dhcp1 at thehobsons.co.uk>wrote:

> I now see what your problem is - you appear to have little understanding of
> IP addressing & routing. A bit like an architect having no knowledge of
> building materials.
>
> And a quick rant before I reply - PLEASE DON'T POST IN HTML THAT SCREWS UP
> THE CONTENT. I fyou want help, then don't leave the people offering it to
> have to edit :
> <http://192.168.2.0>192.168.2.0     <http://0.0.0.0>0.0.0.0 <
> http://255.255.255.0>255.255.255.0   U         0 0          0 eth1
>
> to :
>
> 192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0
> eth1
>
>
>
> abhijit khadatare wrote:
>
>  thanks for ur helpfull reply.
>> my network topology is as below
>>
>> client----->layer2-[switch]----->[if0]router[if1]-------[isc]dhcp server
>>
>> layer2 switch is manager switch----192.168.1.46/24
>> router interface0 -----192.168.1.1/24
>> router interface 1---192.168.2.5/24
>> dhcp server ------192.168.2.1/24
>>
>> i'm putting giaddr as layer2 switch which is 192.168.1.46
>>  PROBLEM  is discover is reached upto the server ,but we dont get any
>> offer
>> routing table is as below
>> #route -en
>> Kernel IP routing table
>> 192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0
>> eth1
>> 192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0
>> eth0
>> 0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0
>> eth0
>>
>> but when i add static route for 192.168.1.1 on server
>>
>> #route -en
>> Kernel IP routing table
>> Destination     Gateway         Genmask         Flags   MSS Window  irtt
>> Iface
>> 192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0
>> eth1
>> 192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0
>> eth1
>> 192.168.0.0     0.0.0.0         255.255.255.0   U         0 0          0
>> eth0
>> 0.0.0.0         192.168.0.1     0.0.0.0         UG        0 0          0
>> eth0
>>
>
> You have NOT added a route to 192.168.1.1 here ! That line should read :
> 192.168.1.0     192.168.2.5     255.255.255.0
>
>  then we got offer we saw on wireshark that
>> discover   from 192.168.2.5 to 192.168.2.1
>> offer from 192.168.2.1 to 192.168.1.46
>>
>
> That is worrying. The request is from 192.168.2.5 but the reply is to
> 192.168.2.46. My guess here is that you have configured both the layer2
> switch AND the router to do DHCP forwarding. You do NOT need to do this, the
> layer2 switch should be transparent to DHCP requests - or if you need it to
> act as the relay agent (such as to use the circuit ID), then you need to
> configure the router to NOT also mangle the packets.
>
>
> Now, to your DHCP config posted in your first message.
>
>  shared-network 224-29 {
>>  subnet 192.168.2.0 netmask 255.255.255.0 {
>>  }
>>  subnet 192.168.1.0 netmask 255.255.255.0 {
>>  }
>>  pool {
>>
>>    allow members of "foo";
>>  log(info ,("ur known to me"));
>>    range 192.168.1.25 192.168.1.50;
>>  }
>>
>>  pool {
>>    deny members of "foo";
>>    ignore unknown-clients;
>>    range 192.168.2.140 192.168.2.150;
>>  }
>>  }
>>
>
> 192.168.1.0/24 and 192.168.2.0/24 are on different networks separated by a
> router - you do NOT have a shared network.
>
> Also, your pool declarations should be INSIDE the subnet declarations, thus
> :
>
> subnet 192.168.2.0 netmask 255.255.255.0 {
>  pool {
>    deny members of "foo";
>    ignore unknown-clients;
>    range 192.168.2.140 192.168.2.150;
>  }
> }
> subnet 192.168.1.0 netmask 255.255.255.0 {
>  pool {
>    allow members of "foo";
>   log(info ,("ur known to me"));
>    range 192.168.1.25 192.168.1.50;
>  }
> }
>
>
>
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