Number of RX packet drops on interfaces increases on a Security Gateway R80.30 and higher with Gaia kernel 3.10

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Technical Level

Solution ID	sk166424
Technical Level
Product	Quantum Security Gateways
Version	R80.20 (EOL), R80.30 (EOL), R80.40, R81, R81.10, R81.20
OS	Gaia
Date Created	20-Apr-2020
Last Modified	23-Nov-2022

Symptoms

Output of the "ifconfig" command on a Security Gateway R80.30 and higher with Gaia kernel 3.10 shows that the number "RX packets - dropped" on interfaces increases.

Example:
Output of the "netstat -ni" command on a Security Gateway R80.30 and higher with Gaia kernel 3.10 shows that the number "RX-DRP packets" on interfaces increases.

Example:
There were no RX packet drops while in the same environment, the same Security Gateway was running R80.20 or lower versions with Gaia kernel 2.6.18.

Cause

Based on the expected Linux OS behavior, various commands in Gaia OS versions from R80.30 to R81 with kernel 3.10 may show RX packet drops on interfaces under these conditions:

The softnet backlog is full
Ethernet frames are received with bad VLAN tags
Packets are received with unknown or unregistered protocols
IPv6 packets are received while IPv6 is disabled in Gaia

Solution

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