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[ScreenOS] Error in Web UI/CLI: 255.x.0.0 exceeds largest network mip supports (class B)

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Article ID: KB29693 KB Last Updated: 03 Dec 2014Version: 1.0
Summary:

This article describes the following error message:

255.x.0.0 exceeds largest network mip supports (class B)

It is sometimes encountered in the Web UI/CLI when configuring a mapped IP (MIP) on an egress interface.

Symptoms:

When attempting to configure a MIP on an egress interface with a subnet mask (for example, 255.254.0.0), the configuration setup fails sometimes with the following error message logged in the Web UI/CLI:

255.254.0.0 exceeds largest network mip supports (class B)

Cause:

The largest network supported by a MIP is Class B (255.255.0.0).

Solution:

This error message is issued in accordance with the design of the firewall.

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