-
Products
-
SonicPlatform
SonicPlatform is the cybersecurity platform purpose-built for MSPs, making managing complex security environments among multiple tenants easy and streamlined.
Discover More
-
-
Solutions
-
Federal
Protect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions
Learn MoreFederalProtect Federal Agencies and Networks with scalable, purpose-built cybersecurity solutions
Learn More - Industries
- Use Cases
-
-
Partners
-
Partner Portal
Access to deal registration, MDF, sales and marketing tools, training and more
Learn MorePartner PortalAccess to deal registration, MDF, sales and marketing tools, training and more
Learn More - SonicWall Partners
- Partner Resources
-
-
Support
-
Support Portal
Find answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials
Learn MoreSupport PortalFind answers to your questions by searching across our knowledge base, community, technical documentation and video tutorials
Learn More - Support
- Resources
- Capture Labs
-
- Company
- Contact Us
Packet Capture shows: Packet dropped - Connection Cache Add Failed
12/20/2019 
178 People found this article helpful
492,401 Views
Description
Running a packet capture is showing a dropped packet as below:
Drop Code: Connection Cache Add Failed (or any type of Cache drop packet)
Cause
This can happen when one side of a TCP connection either ends (FIN) the connection or resets it (RST).The SonicWall keeps track of the state of the TCP connection and once it sees either of these two packets, it closes the socket.All subsequent packets sent on the same socket will be dropped because they are invalid (they reference a connection that no longer exists).
Resolution
In a Site to Site VPN context, to avoid these types of dropped packets it's strongly recommended to use Public IP addresses on the WAN interfaces of both sides of the VPN.
Indeed a double NAT in some network environments can cause issues with the packet transmission and as a consequence drops packets.
Related Articles
- How to Block Google QUIC Protocol on SonicOSX 7.0?
- How to block certain Keywords on SonicOSX 7.0?
- How internal Interfaces can obtain Global IPv6 Addresses using DHCPv6 Prefix Delegation
Categories
- Firewalls > NSa Series > System
- Firewalls > TZ Series > System
- Firewalls > NSv Series > System
YES
NO