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How to Troubleshoot Packet Drops and ISP/WAN Connectivity Issues

06/07/2021 29 People found this article helpful 87,467 Views

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    Description

    This article will list all initial and most common configuration you can apply when facing issues with packet drops or ISP throughput.

    Resolution

    Pre-Requisites:
    • Explanation of Drop Code and Module ID Values
    Troubleshooting (Packet Drops):
    • How Do I Resolve Drop Code: Packet Dropped Policy Drop?
    • Packet Capture Shows Packet Dropped: Connection Cache Add Failed
    • Packets Dropped with Enforced Firewall Rule
    • Packet Dropped as IP Sanity Test Failed
    • Troubleshooting Content Filter Drops
    • Packet Dropped: UDP and ICMP Flood Protection
    • How Can I Resolve Drop Code IP Spoof?
    • Packet Dropped: DNS Rebind Attack
    • The Log Shows Received Packet Retransmission Drop Duplicate Packet
    • Log Message Indicates Malformed or Unhandled IP Packets Dropped
    • Dropped Packets Because of Invalid TCP Flag
    • Drop Packet: NAT Remap obtained Invalid Translated Source From Original Offset
    Troubleshooting (VPN):
    • Troubleshooting VPN Packet Drops with Drop Code Message: Octeon Decryption Failed
    • SSLVPN feature: NetExtender Packets Dropped with Enforced Firewall Rule or Policy Drop
    • Drop Code: 338, Octeon Decryption Failed for Inbound Packet
    • Log Shows IPSec Packet To or From Illegal Host
    Troubleshooting (ISP Connectivity):
    • Troubleshooting PPTP ISP connectivity issues
    • Troubleshooting L2TP ISP Connectivity issues
    • Troubleshooting PPPOE ISP Connectivity Issues
    Troubleshooting (ISP Throughput):
    • Troubleshooting Network Throughput, Latency and Bandwidth Issues with a SonicWALL
    • How Can I Troubleshoot Slow Internet Speeds in SonicWALL Firewall?
    • Tips For Troubleshooting Speed and Throughput Issues on a SonicWALL Firewall
    • How To Use IPERF To Measure Throughput on a SonicWALL Firewall


    Related Articles

    • How to configure SSLVPN Tunnel all mode for one or more particular users (Local or Domain users)
    • How to disable TOTP for a Local User with admin privileges via CLI.
    • Parserror on Event logs.

    Categories

    • Firewalls > TZ Series
    • Firewalls > SonicWall SuperMassive 9000 Series
    • Firewalls > NSa Series
    • Firewalls > SonicWall NSA Series

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