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[ScreenOS] What kind of a packet is dropped by the firewall due to 'in misc err'?

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Article ID: KB17659 KB Last Updated: 26 Jan 2021Version: 6.0
Summary:

This article provides information about the in misc err counter.

 

Symptoms:

The in misc err counter is incrementing, along with the in overrun counter.  What kind of a packet would cause the in misc err counter to increment?

 

Solution:

A misc error can be characterized as:

  • An incomplete packet

  • An interface speed/duplex mismatch

  • A packet that is missing data

When the in misc err counter is incrementing, there may or may not be an increase in the in overrun counter.

The in misc err counter is normally associated with the in overrun (similar to out misc err being associated with out underrun) counter, which means that the buffer is receiving packets that are too large to be stored in the buffer. So, both the counters increase at the same rate.

It is also possible for the in misc err counter to increment without the in overrun counter incrementing. This situation could occur if certain packets, which are incomplete, arrive but overall that interface is not being overwhelmed.

 

Modification History:

2021-01-26: Content reviewed for accuracy

 

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