DHCP - need help

I have 2 DHCP servers Windows 2003 SP2 in my network. Because we have 400
computers we have a class B IP.
My question:

Our both DHCP send IP (like 172.22.25.255) the 255 octet is correct?

My address Poll Server1:

172.22.1.254 - 172.22.254.254 - Addess range for distribution
172.22.7.1 - 172.22.254.254 - IP Addresses excluded from distribution
172.22.0.100 - 172.22.2.254 - IP Addresses excluded from distribution

My address Poll Server2:

172.22.1.254 - 172.22.254.254 - Addess range for distribution
172.22.3.1 - 172.22.6.254 - IP Addresses excluded from distribution
172.22.18.1 - 172.22.254.254 - IP Addresses excluded from distribution

Thanks in advance

Hi José,

Yes, it's correct. It's a valid IP Address within the range specified
(172.22.25.0 is also a valid IP within that range, for example).

Is the address causing problems at all?

Chris Dent
MVP - Directory Services

"José Almeida" <(E-Mail Removed)> wrote in message
news:FA9F9571-0351-4080-B9F6-(E-Mail Removed)...
>I have 2 DHCP servers Windows 2003 SP2 in my network. Because we have 400
> computers we have a class B IP.
> My question:
>
> Our both DHCP send IP (like 172.22.25.255) the 255 octet is correct?
>
> My address Poll Server1:
>
> 172.22.1.254 - 172.22.254.254 - Addess range for distribution
> 172.22.7.1 - 172.22.254.254 - IP Addresses excluded from distribution
> 172.22.0.100 - 172.22.2.254 - IP Addresses excluded from distribution
>
> My address Poll Server2:
>
> 172.22.1.254 - 172.22.254.254 - Addess range for distribution
> 172.22.3.1 - 172.22.6.254 - IP Addresses excluded from distribution
> 172.22.18.1 - 172.22.254.254 - IP Addresses excluded from distribution
>
> Thanks in advance
>

"José Almeida" <(E-Mail Removed)> wrote in message
news:FA9F9571-0351-4080-B9F6-(E-Mail Removed)...
>I have 2 DHCP servers Windows 2003 SP2 in my network. Because we have 400
> computers we have a class B IP.
> My question:
>
> Our both DHCP send IP (like 172.22.25.255) the 255 octet is correct?
>
> My address Poll Server1:
>
> 172.22.1.254 - 172.22.254.254 - Addess range for distribution
> 172.22.7.1 - 172.22.254.254 - IP Addresses excluded from distribution
> 172.22.0.100 - 172.22.2.254 - IP Addresses excluded from distribution
>
> My address Poll Server2:
>
> 172.22.1.254 - 172.22.254.254 - Addess range for distribution
> 172.22.3.1 - 172.22.6.254 - IP Addresses excluded from distribution
> 172.22.18.1 - 172.22.254.254 - IP Addresses excluded from distribution
>
> Thanks in advance
>

1) The way I read this, you have two DHCP servers setup to pass out the SAME
IPs. I'd recommend narrowing the scope so that each server had enough for
all your clients (400?) but do not overlap each others scope. This would
allow for continuing operations should one server go down.

2) Why so many exceptions? You are reserving one heck of a lot of addresses.
Reason? Seems overly complicated to me. Maybe not.

-Frank

You said:

Is the address causing problems at all?

My answer:

No but some colleagues think that this IP with last octet 255 make broadcast.

Many tanks Chris

José Almeida


"Chris Dent [MVP]" wrote:

Many thanks Chris

>
> Hi José,
>
> Yes, it's correct. It's a valid IP Address within the range specified
> (172.22.25.0 is also a valid IP within that range, for example).
>
> Is the address causing problems at all? No but some collegues think that this IP with last octet 255 make broadcast.
>
> Chris Dent
> MVP - Directory Services
>
> "José Almeida" <(E-Mail Removed)> wrote in message
> news:FA9F9571-0351-4080-B9F6-(E-Mail Removed)...
> >I have 2 DHCP servers Windows 2003 SP2 in my network. Because we have 400
> > computers we have a class B IP.
> > My question:
> >
> > Our both DHCP send IP (like 172.22.25.255) the 255 octet is correct?
> >
> > My address Poll Server1:
> >
> > 172.22.1.254 - 172.22.254.254 - Addess range for distribution
> > 172.22.7.1 - 172.22.254.254 - IP Addresses excluded from distribution
> > 172.22.0.100 - 172.22.2.254 - IP Addresses excluded from distribution
> >
> > My address Poll Server2:
> >
> > 172.22.1.254 - 172.22.254.254 - Addess range for distribution
> > 172.22.3.1 - 172.22.6.254 - IP Addresses excluded from distribution
> > 172.22.18.1 - 172.22.254.254 - IP Addresses excluded from distribution
> >
> > Thanks in advance
> >
>
>
>

Hey José,

I can see why they might want to see that, but it isn't

There are two reserved addresses in any given network range, they are the
network and broadcast address as you probably know. The network is always
the first address in the range, the broadcast the last. Every address
inbetween is a valid host address and should be perfectly acceptable.

The range you're distributing implies a subnet mask of 255.255.0.0, if that
is the case the Broadcast Address is 172.22.255.255 (with the network
address on 172.22.0.0). Any other version of 172.22.x.255 is a valid host
address.

Chris
MVP - Directory Services


"José Almeida" <(E-Mail Removed)> wrote in message
news:0B27A10F-1F12-4CED-85A4-(E-Mail Removed)...
>
> You said:
>
> Is the address causing problems at all?
>
> My answer:
>
> No but some colleagues think that this IP with last octet 255 make
> broadcast.
>
> Many tanks Chris
>
> José Almeida
>
>
> "Chris Dent [MVP]" wrote:
>
> Many thanks Chris
>
>>
>> Hi José,
>>
>> Yes, it's correct. It's a valid IP Address within the range specified
>> (172.22.25.0 is also a valid IP within that range, for example).
>>
>> Is the address causing problems at all? No but some collegues think that
>> this IP with last octet 255 make broadcast.
>>
>> Chris Dent
>> MVP - Directory Services
>>
>> "José Almeida" <(E-Mail Removed)> wrote in message
>> news:FA9F9571-0351-4080-B9F6-(E-Mail Removed)...
>> >I have 2 DHCP servers Windows 2003 SP2 in my network. Because we have
>> >400
>> > computers we have a class B IP.
>> > My question:
>> >
>> > Our both DHCP send IP (like 172.22.25.255) the 255 octet is correct?
>> >
>> > My address Poll Server1:
>> >
>> > 172.22.1.254 - 172.22.254.254 - Addess range for distribution
>> > 172.22.7.1 - 172.22.254.254 - IP Addresses excluded from distribution
>> > 172.22.0.100 - 172.22.2.254 - IP Addresses excluded from distribution
>> >
>> > My address Poll Server2:
>> >
>> > 172.22.1.254 - 172.22.254.254 - Addess range for distribution
>> > 172.22.3.1 - 172.22.6.254 - IP Addresses excluded from distribution
>> > 172.22.18.1 - 172.22.254.254 - IP Addresses excluded from distribution
>> >
>> > Thanks in advance
>> >
>>
>>
>>