Hello,
you could split the usage of nat pools based on statistics of the source
IP addresses eg use 1 ip/overloaded nat pool for even source IPs and
another IP for the odd source IPs
Best Regards,
John
On Wed, 25 Feb 2009, [email protected] wrote:
Hi,
I have a client who has moved their Microsoft Exchange servers to a
service provider location (as part of a de-perimeterization strategy).
These servers are reachable via the Internet. Thus, the client IP are
NATted before they cross the corporate boundary. There are about 45000
users. Each user needs about 17-22 sessions (that's how MS Outlook
works) and thus as many NAT entries Therefore a NAT pool is used with
overload. It was working fine for more than a year now but suddenly the
following phenomenon has been noticed. - When a user session is being
built up and he has let's say 10 NAT entries using the first IP in the
NAT pool and the port numbers run out, the next IP in the NAT pool is
used to complete the required number of sessions. - Exchange server is
apparently not happy with one client using 2 IP addresses and keeps
(re-)building sessions untill all of them are using the same NATted IP.
This can sometimes take upto 5 miniutes.
Is there a solution to this problem? There is one single destination
global address. Is there a way to force the usage of the same IP from
the NAT pool for all NAT requests from a particular source IP? Platform
is7206-vxr with NPE-G2
Thanks in advance
Nasir Shaikh
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