Why on earth would you want an assigned IP block?
Private address space should be sufficient for any organisation that
requires a block of IP addresses; and private address space offers
the unique security feature that individual addresses are not
propagated on the Internet past the first firewall or NAT making it
extremely difficult (although not totally impossible) for hackers to
gain access to your internal machines.
For completeness, here is the list of private addresses defined in
RFC1597:
10.0.0.0 to 10.255.255.255
172.16.0.0 to 172.31.255.255
192.168.0.0 to 192.168.255.255
My advice is - Give them ALL the addresses back, choose a
private address scheme and reassign all your machines. Go
through the pain. Reconfigure your router/gateway/firewall/NAT and
move on. The advantage for all this once-off pain is that NO ONE
will ever again dictate a change in IP addressing in your
organisation. You can allocate as many or as few addresses as
you wish, making your scheme as complicated or as simple as
you need and sub-addressing whatever you want for whichever
branch offices that you have, etc.
Russell Ashdown
On 18 Apr 01, at 18:40, Alan Lee wrote about:
[SLUG] ISP requests IP block back
> I have two IP address blocks
<snip>
> My ISP has requested one of them back, I have had this address rang for over
> a year now.
<snip>
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