topic Re: Maximum number of NAT pool entries EXOS X590 in ExtremeSwitching (EXOS/Switch Engine)

Maximum number of NAT pool entries EXOS X590

kweheria — Thu, 02 Sep 2021 14:19:14 GMT

What is the Maximum number of NAT pool entries that can be configured on an Extreme Networks EXOS X590 series switch.

The SSA series has a limitation of 10 pools.
Global Bindings: 65536
IP Addresses: 2000
Pools: 10
Port Mapped Addresses: 20

Re: Maximum number of NAT pool entries EXOS X590

Stefan_K_ — Thu, 02 Sep 2021 14:52:33 GMT

Hi,

for NAT you need at least EXOS 31.2. Here is some information with some general limitations: https://documentation.extremenetworks.com/release_notes/ExtremeXOS/31.2/GUID-B63C14FB-27E8-48E4-AF4C-DA0E20091AD0.shtml

And the limits are as follows:

Network Address Translation (NAT) VLANs—maximum number of NAT VLANs.	ExtremeSwitching X465, X590, X690, X695, X870	4
Network Address Translation (NAT) Sessions—number of NAT sessions supported (non twice-NAT).	ExtremeSwitching X465, X590, X690, X695, X870	1,024

https://documentation.extremenetworks.com/release_notes/ExtremeXOS/31.2/GUID-2DA73D0E-3C7C-411D-8B16-AD1E7CB16B4F.shtml

Re: Maximum number of NAT pool entries EXOS X590

kweheria — Thu, 02 Sep 2021 15:22:45 GMT

Thanks for your swift response.

Just for clarity, this means a maximum of 4 NAT VLANs - this is well understood.

Is the figure of 1024 sessions also equivalent to number of NAT rule entries?

My question is in reference to a scenario that has multiple rules that overload a whole /23 subnet to a single or 2 public IPs.

Can I get away with 1024 as the maximum number of rule entries?

Below is a sample config for clarification:-

enable ip nat
configure ip nat add vlan INTERNET-SERVICE direction both
configure ip nat rule SITE-01 source 10.0.0.0/23 new-source x.x.x.1/31 >>>>>>> =+64K sessions sessions per public IP
configure ip nat rule SITE-01 source 10.0.0.0/23 new-source x.x.x.2/31 >>>>>>> =Another +64K sessions per public IP
configure ip nat rule SITE-01 egress vlan INTERNET-SERVICE
enable ip nat rule SITE-01

Warm regards.

Re: Maximum number of NAT pool entries EXOS X590

Stefan_K_ — Thu, 02 Sep 2021 15:27:57 GMT

Tbh I don’t really now how Extreme defines “Session” If they mean the standard NAT-session then 1024 is not really that much since every internal host can have multiple parallel sessions at once.

Re: Maximum number of NAT pool entries EXOS X590

kweheria — Thu, 02 Sep 2021 15:34:37 GMT

@Stefan K.

Thanks a million for the response.