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How IP addresses made up w/DHCP ?

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Al Franz

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Jan 11, 2002, 3:57:03 PM1/11/02
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I have a small router setup which can assign IP addresses from 192.168.2.2
to 192.168.2.40. What determines what number gets assigned? If I would
update the operating system on some of the PC's would that change the number
that gets assigned. What if I would swap cable connections to the hub?
Confused as to how they get assigned and if I should worry about conflicts.
Since a couple of the machines I have use operating systems that don't
support DHCP I have to hand code the address in config files for those.
Wondering if they could ever conflict with other PC's no the network as
things change.

Appreciate any info.


Unknown

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Jan 11, 2002, 4:46:26 PM1/11/02
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>I have a small router setup which can assign IP addresses from 192.168.2.2
>to 192.168.2.40. What determines what number gets assigned?

It's a random number multiplied by the number of newsgroups posted to.
I'm surprised your addresses are still within the valid range, given
your copious crosspostings... :)

DHCP has a range of numbers. The system requesting a number gets the
next available number. Once a number has been assigned, the DHCP
"remembers" the system and tries to reassign the same number for a
while. If the machine doesn't come back on the network for a while,
or the DHCP runs out of numbers, it reassigns the older ones.

>If I would
>update the operating system on some of the PC's would that change the number
>that gets assigned.

Not in itself, no. The IP's are remembered by the MAC address of the
network card.

>What if I would swap cable connections to the hub?

No effect at all.

>Confused as to how they get assigned and if I should worry about conflicts.

There won't be conflicts *if* you don't assign any addresses manually
in the same range as the DHCP is using.

>Since a couple of the machines I have use operating systems that don't
>support DHCP I have to hand code the address in config files for those.
>Wondering if they could ever conflict with other PC's no the network as
>things change.

See above. Make sure you have DHCP assigning out of a range you're
not manually assigning static numbers from and you're fine.

Jeff

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