new IPs for our name servers problems

[Michael Dilworth]

hi all

i am wondering if anyone can help because I am a little stuck with this one.

We are in the process of moving our address space from a PA block to a PI
block.  This means I have had to use 2 new IPs for our name servers.

the old address space was 89.221.36.0/24 and the new address space is
91.213.52.0/24

the old name servers we on 89.221.36.20 and 89.221.36.30  I have now updated
the records and we use

ns1.upstreamsystems.com on 91.213.52.20
ns2.upstreamsystems.com on 91.213.52.30


I made these changes about 2 weeks ago at which time i had
very aggressive TTL and minimum values set. My aim being to have the changes
updated within the Internet quite quickly.

The problem I have is that I am still receiving many DNS requests on the
89.221.36.20 and 89.221.36.30 IPs even though my queries out on the net all
say the new IPs are in use.

Furthermore, if i stop my name servers using the 89.221.36.20 and 30 and
then block traffic to these on the firewall DNS lookups from remote hosts
stops working! (e.g. dig ns1.upstreamsystems.com A times out)

perhaps the root or top level servers have still the old data cached? is
this possible?

does anyone have any ideas?

thanks

mike



-- 
Mike  Dilworth

Upstream S.A.
Mob     :  +30-697-283-4750
Office  :  +30-210-661-8500
Direct  :  +30-210-661-8521
Fax       :  +30-210-661-8550

www.upstreamsystems.com

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