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 This email contains information from BT Nederland N.V., which may be privileged or confidential. It's meant only for the individual(s) or entity named above. If you are not the intended recipient, note that disclosing, copying, distributing or using this information is prohibited. If you have received this email in error, please let me know immediately on the email address above. We monitor our systems, and may record your emails. BT Nederland N.V. Registered office: Offices Minerva and Mercurius, Herikerbergweg 2, 1101 CM Amsterdam Registered at the Amsterdam Chamber of Commerce no: 33296214 _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
